IEC 60730-2-9:2015
(Main)Automatic electrical controls - Part 2-9: Particular requirements for temperature sensing controls
Automatic electrical controls - Part 2-9: Particular requirements for temperature sensing controls
IEC 60730-2-9:2015 applies to automatic electrical temperature sensing controls for use in, on or in association with equipment, including electrical controls for heating, air-conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof. This standard is applicable to automatic electrical temperature sensing controls forming part of a building automation control system within the scope of ISO 16484. This standard also applies to automatic electrical temperature sensing controls for equipment that may be used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications. This standard does not apply to automatic electrical temperature sensing controls intended exclusively for industrial process applications, unless explicitly mentioned in the relevant equipment standard. This standard applies to the inherent safety, to the operating values, operating times, and operating sequences where such are associated with equipment safety, and to the testing of automatic electrical temperature sensing control devices used in, or in association with, equipment. This standard is also applicable to the functional safety of low complexity safety-related temperature sensing controls and systems. This fourth edition cancels and replaces the third edition published in 2008, and its Amendment 1:2011. This edition constitutes a technical revision. This edition includes alignment with the text of 60730-1 fifth edition and the following significant technical changes with respect to the previous edition:
- modification of heating-freezing tests in Clause 12;
- alignment of the EMC requirements in H.26 to those in other part 2 standards and
- addition of requirements in Clause H.27 to cover class B and C control functions of temperature sensing controls.
This publication is to be read in conjunction with IEC 60730-1:2013.
Dispositifs de commande électrique automatiques – Partie 2-9: Exigences particulières pour les dispositifs de commande thermosensibles
IEC 60730-2-9:2015 s'applique aux dispositifs de commande électrique automatiques thermosensibles pour usage dans, sur ou en association avec des appareils, y compris les dispositifs de commande électrique pour le chauffage, le conditionnement d'air et applications analogues. L’équipement peut fonctionner à l'électricité, au gaz, au pétrole, aux combustibles solides, à l'énergie solaire, etc., ou à une de leurs combinaisons.
La présente norme s'applique aux dispositifs de commande électrique automatiques thermosensibles faisant partie d’un système de commande d’automatisation des bâtiments qui relève du domaine d'application de l’ISO 16484.
La présente norme s’applique également aux dispositifs de commande électrique automatiques thermosensibles des équipements qui peuvent être utilisés par le public (les équipements destinés à être utilisés dans des magasins, des bureaux, des hôpitaux, des fermes et des applications commerciales et industrielles, par exemple).
La présente norme ne s'applique pas aux dispositifs de commande électrique automatiques thermosensibles prévus exclusivement pour des applications industrielles, sauf mention particulière dans la norme d’équipement appropriée.
La présente norme s'applique à la sécurité intrinsèque, aux valeurs de fonctionnement, aux temps de fonctionnement et aux séquences de fonctionnement dans la mesure où ils interviennent dans la sécurité de l’équipement, ainsi qu'aux essais des dispositifs de commande électrique automatiques thermosensibles utilisés dans ou avec l’équipement.
Cette quatrième édition annule et remplace la troisième édition parue en 2008 et son Amendement 1:2011. Cette édition constitue une révision technique. Cette édition inclut l’alignement sur le texte de la cinquième édition de l’IEC 60730-1 et les modifications techniques majeures suivantes par rapport à l'édition précédente:
modification des essais d’échauffement-congélation à l’Article 12;
alignement des exigences CEM en H.26 sur celles d’autres normes de la partie 2;
ajout d’exigences en H.27 pour couvrir les fonctions de commande des classes B et C des dispositifs de commande thermosensibles.
La présente Partie 2-9 doit être utilisée conjointement avec l’IEC 60730-1.
General Information
Relations
Overview
IEC 60730-2-9:2015 (consolidated with Amendments 2018 & 2020) is the International Electrotechnical Commission’s particular requirements for automatic electrical temperature sensing controls. It supplements IEC 60730-1 and applies to controls used in or with equipment for heating, air‑conditioning and similar applications that may use electricity, gas, oil, solid fuel, solar thermal energy or combinations thereof. The standard covers inherent safety, operating values, times and sequences related to safety, testing, and the functional safety of low‑complexity safety‑related temperature sensing controls. It is intended for devices used in buildings and public environments (shops, offices, hospitals, farms, commercial and industrial settings) and aligns with building automation within the scope of ISO 16484.
Key topics and technical requirements
- Scope & applicability: Controls for building automation, public-use equipment; excludes exclusive industrial process controls unless specified.
- Safety & functional requirements: Inherent safety, operating values, operating times and sequences that affect equipment safety; provisions for low‑complexity safety functions.
- Testing & performance: Endurance, heating-freezing tests (modified in this edition), moisture/dust resistance, electric strength, insulation resistance, drift and manufacturing deviation, mechanical strength and threaded connections.
- Electronic controls & EMC: Annex H provides requirements for electronic controls; EMC requirements (H.26) aligned with other Part 2 standards and new H.27 requirements cover Class B and C control functions of temperature sensing controls.
- Sensor-specific guidance: Annex J addresses thermistor elements and thermistor-based controls.
- Application guidance & annexes: Informative annex EE gives practical guidance on applying temperature sensing controls; other annexes cover agricultural confinement buildings (DD), time factor, cycle counts and heat/fire resistance.
Practical applications
IEC 60730-2-9 is used to design, test and certify temperature sensing controls in:
- HVAC and building automation systems
- Room thermostats, temperature limiters and thermal cut‑outs
- Controls for boilers, heat pumps, fan coils and heat exchangers
- Equipment deployed in public or commercial environments (offices, hospitals, shops)
- Agricultural confinement building controls (see Annex DD)
Who should use this standard
- Manufacturers of thermostats, temperature limiters, thermistor-based controls and electronic temperature controllers
- Product safety and compliance engineers and test laboratories performing IEC 60730 testing and certification
- Building automation and HVAC system integrators and designers ensuring component compliance
- Certification bodies and regulatory authorities assessing conformity
Related standards
- IEC 60730-1 (General requirements for automatic electrical controls) - to be read in conjunction with Part 2-9
- ISO 16484 (Building automation) - for controls within building automation scope
Keywords: IEC 60730-2-9, temperature sensing controls, automatic electrical controls, building automation, thermistor, EMC, functional safety, heating-freezing tests.
Standards Content (Sample)
IEC 60730-2-9 ®
Edition 4.0 2015-05
INTERNATIONAL
STANDARD
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
IEC 60730-2-9 ®
Edition 4.0 2015-05
INTERNATIONAL
STANDARD
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.120 ISBN 978-2-8322-2673-5
– 2 – IEC 60730-2-9:2015 © IEC 2015
CONTENTS
FOREWORD . 4
1 Scope and normative references . 7
2 Terms and definitions . 8
3 General requirements . 10
4 General notes on tests . 10
5 Rating . 11
6 Classification . 11
7 Information . 12
8 Protection against electric shock . 14
9 Provision for protective earthing . 14
10 Terminals and terminations . 14
11 Constructional requirements . 14
12 Moisture and dust resistance . 17
13 Electric strength and insulation resistance . 18
14 Heating . 18
15 Manufacturing deviation and drift . 19
16 Environmental stress . 20
17 Endurance . 20
18 Mechanical strength . 26
19 Threaded parts and connections . 28
20 Creepage distances, clearances and distances through solid insulation . 28
21 Resistance to heat, fire and tracking . 28
22 Resistance to corrosion . 28
23 Electromagnetic compatibility (EMC) requirements – Emission . 28
24 Components . 29
25 Normal operation . 29
26 Electromagnetic compatibility (EMC) requirements – Immunity . 29
27 Abnormal operation . 29
28 Guidance on the use of electronic disconnection . 29
Annexes . 30
Annex G (normative) Heat and fire resistance tests . 30
Annex H (normative) Requirements for electronic controls . 31
Annex J (normative) Requirements for thermistor elements and controls using
thermistors . 38
a, b
Annex AA (informative) Maximum manufacturing deviation and drift . 39
Annex BB (informative) Time factor . 40
Annex CC (informative) Number of cycles. 43
Annex DD (normative) Controls for use in agricultural confinement buildings. 44
Annex EE (informative) Guide to the application of temperature sensing controls within
the scope of IEC 60730-2-9 . 47
Bibliography . 63
Figure 101 – Impact tool . 16
Figure 102 – Aluminium cylinder for temperature change method . 26
Figure BB.1 – Determination of time factor in the case of a sudden temperature change . 41
Figure BB.2 – Determination of time factor in the case of a linear rise of test-bath
temperature . 42
Figure EE.1 – Thermostat . 55
Figure EE.2 – Self-resetting temperature limiter . 56
Figure EE.3 – Non-self-resetting temperature limiter . 57
Figure EE.4 – Self-resetting thermal cut-out . 58
Figure EE.5 – Manual reset thermal cut-out . 58
Figure EE.6 – Single operation device . 60
Figure EE.7 – Three-stage control system . 61
Table 1 – Required information and methods of providing information . 13
Table H.101 – Compliance criteria . 33
Table BB.1 – Method to determine and verify time factor values (see 11.101) . 42
Table EE.1 – Typical examples of the classification of temperature sensing controls in
accordance with IEC 60730-2-9 . 62
– 4 – IEC 60730-2-9:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60730-2-9 has been prepared by technical committee TC 72:
Automatic electrical controls.
The text of this standard is based on the following documents:
FDIS Report on voting
72/990/FDIS 72/998/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This fourth edition cancels and replaces the third edition published in 2008, and its
Amendment 1:2011. This edition constitutes a technical revision. This edition includes
alignment with the text of 60730-1 fifth edition and the following significant technical changes
with respect to the previous edition:
a) modification of heating-freezing tests in Clause 12;
b) alignment of the EMC requirements in H.26 to those in other part 2 standards;
c) addition of requirements in Clause H.27 to cover class B and C control functions of
temperature sensing controls;
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-9 is intended to be used in conjunction with IEC 60730-1. It was established on the
basis of the fifth edition (2013) of that publication. Consideration may be given to future
editions of, or amendments to, IEC 60730-1.
This Part 2-9 supplements or modifies the corresponding clauses in IEC 60730-1 so as to
convert that publication into the IEC standard: Particular requirements for temperature sensing
controls.
Where this Part 2-9 states "addition", "modification", or "replacement", the relevant
requirement, test specification or explanatory matter in part 1 should be adapted accordingly.
Where no change is necessary, this part 2 indicates that the relevant clause or subclause
applies.
In the development of a fully international standard, it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The “in some countries” notes regarding differing national practices are contained in the
following subclauses:
4.1.101 17.8.4.101 Annex AA
7.2, Table 1 17.16.101 Clause CC.2
11.4.101 17.16.102 DD.9.2
11.101 17.16.105 EE.3.6
12.101.3 18.102.3
13.2 23.101
In this publication:
1) The following print types are used:
– Requirements proper: in roman type;
– Test specifications: in italic type;
– Notes; in small roman type;
– Words defined in Clause 2: bold.
2) Subclauses, notes, tables and figures which are additional to those in part 1 are numbered
starting from 101, additional annexes are lettered AA, BB, etc.
A list of all parts of the IEC 60730 series, published under the title Automatic electrical controls
can be found on the IEC website.
– 6 – IEC 60730-2-9:2015 © IEC 2015
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
1 Scope and normative references
This clause of Part 1 is applicable except as follows:
1.1 Scope
Replacement:
This part of IEC 60730 applies to automatic electrical temperature sensing controls for use in,
on or in association with equipment, including electrical controls for heating, air-conditioning
and similar applications. The equipment may use electricity, gas, oil, solid fuel, solar thermal
energy, etc., or a combination thereof.
NOTE Throughout this standard, the word "equipment" includes "appliance" and "control system".
This standard is applicable to automatic electrical temperature sensing controls forming part
of a building automation control system within the scope of ISO 16484.
This standard also applies to automatic electrical temperature sensing controls for equipment
that may be used by the public, such as equipment intended to be used in shops, offices,
hospitals, farms and commercial and industrial applications.
This standard does not apply to automatic electrical temperature sensing controls intended
exclusively for industrial process applications, unless explicitly mentioned in the relevant
equipment standard.
1.1.1
Replacement:
This standard applies to the inherent safety, to the operating values, operating times, and
operating sequences where such are associated with equipment safety, and to the testing of
automatic electrical temperature sensing control devices used in, or in association with,
equipment.
NOTE Examples of such controls include boiler thermostats, fan controls, temperature limiters and thermal
cut-outs.
This standard is also applicable to the functional safety of low complexity safety-related
temperature sensing controls and systems.
1.1.2
Addition:
This standard also applies to the electrical safety of temperature sensing controls with non-
electrical outputs such as refrigerant flow and gas controls.
– 8 – IEC 60730-2-9:2015 © IEC 2015
1.1.3 Not applicable.
1.1.4
Replacement:
This standard applies to manual controls when such are electrically and/or mechanically
integral with automatic temperature sensing controls.
NOTE Requirements for manual switches not forming part of an automatic control are contained in IEC 61058-1.
1.1.5
Replacement:
This standard applies to a.c. or d.c. powered temperature sensing controls with a rated
voltage not exceeding 690 V a.c. or 600 V d.c.
1.1.6
Replacement:
This standard does not take into account the response value of an automatic action of a
temperature sensing control, if such a response value is dependent upon the method of
mounting it in the equipment. Where a response value is of significant purpose for the
protection of the user, or surroundings, the value defined in the appropriate equipment
standard or as determined by the manufacturer shall apply.
1.1.7
Replacement:
This standard applies also to temperature sensing controls incorporating electronic devices,
requirements for which are contained in Annex H and to temperature sensing controls using
NTC thermistors or PTC thermistors, requirements for which are contained in Annex J.
Additional subclause:
1.1.101 This standard applies to single operation devices as defined in this standard.
1.1 Normative references
Addition:
IEC 60216-1:2013, Electrical insulating materials – Thermal endurance properties – Part 1:
Ageing procedures and evaluation of test results
IEC 60691, Thermal links – Requirements and application guide
IEC 60730-2-4, Automatic electrical controls for household and similar use – Part 2-4:
Particular requirements for thermal motor protectors for motor-compressors of hermetic and
semi-hermetic type
2 Terms and definitions
This clause of Part 1 is applicable except as follows:
2.2 Definitions of types of control according to purpose
2.2.19
operating control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermostat is an operating control.
2.2.20
protective control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermal cut-out is a protective control.
Additional definitions:
2.2.101
single-operation device
SOD
control having a temperature sensing element which is intended to operate only once and
then requires complete replacement
2.2.101.1
bimetallic single-operation device
single operation device (SOD) having a bimetallic temperature sensing element
Note 1 to entry: A bimetallic single operation device (SOD) does not reset above a declared temperature (see
11.4.103).
Note 2 to entry: Requirements for thermal links (which are not allowed to reset) are contained in IEC 60691.
2.2.101.2
non-bimetallic single-operation device
single operation device (SOD) having a temperature sensing element which is part of a
combination action control, the operation of which cannot be separated from other functions
of the control and having a non-bimetallic thermal element that operates only once and then
requires complete or partial replacement
Note 1 to entry: When such parts can be tested separately, they are considered to be thermal links within the
scope of IEC 60691.
Note 2 to entry: The ageing period and thermal response of the device is dependent on the intended use of the
device. As a result, the nature of the testing applicable to the device is representative of the application conditions
for which the protective control is intended (see 7.2).
Note 3 to entry: Non-bimetallic SODs provide the equivalent of micro-disconnection.
2.2.101.2.1
rated functioning temperature
T
f
temperature of the sensing element of a non-bimetallic SOD which causes it to change the
state of conductivity of the control when measured under specified conditions as declared by
the manufacturer
2.2.102
room thermostat
independently mounted or incorporated thermostat intended to control the temperature of
habitable space
– 10 – IEC 60730-2-9:2015 © IEC 2015
2.2.103
fan control
automatic temperature sensing control intended to control the operation of a fan or blower
2.2.104
boiler thermostat
thermostat intended to control boiler/liquid temperature
2.2.105
modulating thermostat
thermostat which controls the temperature between two limits by continuously controlling the
input to the load
2.2.106
voltage maintained thermal cut-out
thermal cut-out which is maintained in its operated condition by the voltage which appears
across it in that condition
2.2.107
agricultural thermostat
thermostat intended for use in agricultural confinement buildings
2.3 Definitions relating to the function of controls
2.3.14 Additional definition:
2.3.14.101
time factor
transient response of temperature sensing controls by defined change of the activating
quantity
2.5 Definitions of types of control according to construction
Additional definitions:
2.5.101
push-and-turn actuation
two-step actuation accomplished by first pushing, then rotating the actuating member of the
control
2.5.102
pull-and-turn actuation
two-step actuation accomplished by first pulling, then rotating the actuating member of the
control
3 General requirements
This clause of Part 1 is applicable.
4 General notes on tests
4.1 Conditions of test
This clause of Part 1 is applicable except as follows:
4.1 Conditions of test
Additional subclauses:
4.1.101 For the purposes of the tests of this standard and unless otherwise indicated,
ambient temperature excursions beyond T during abnormal operation as a precursor to
max
the operation of a manual reset thermal cut-out or a bimetallic SOD are ignored.
NOTE In Canada and the USA, the preceding applies only to bimetallic SODs.
4.1.102 For manual reset thermal cut-outs and bimetallic SODs which have an operating
value above T , the temperature at the sensing element is raised, as necessary, to achieve
max
any cycling required during the tests.
4.2 amples required
4.2.1 Addition:
Six samples of bimetallic SODs are used for the test of Clause 15 and a further six for the test
of Clause 17.
5 Rating
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows:
6.4 According to features of automatic action
6.4.3 Additional subclauses:
6.4.3.101 – for sensing actions, no increase in the operating value as a result of any leakage
from the sensing element, or from parts connecting the sensing element to the switch head
(type 2.N);
6.4.3.102 – an action which operates after a declared thermal cycling test as specified
in 17.101 (type 2.P);
NOTE In general, thermal cut-outs for specific applications, such as pressurized water heating systems, may be
classified as having Type 2.P action.
6.4.3.103 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation and in which only rotation is required to return the actuating member to the
OFF position or rest position (type 1.X or 2.X);
6.4.3.104 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation (type 1.Z or 2.Z);
6.4.3.105 – an action which cannot be reset under electrically loaded conditions (type 1.AK
or 2.AK);
6.4.3.106 – an action which operates after declared agricultural environmental exposures
(type 1.AM or 2.AM).
– 12 – IEC 60730-2-9:2015 © IEC 2015
6.7 According to ambient temperature limits of the switch head
Additional subclauses:
6.7.101 Controls for use in or on cooking appliances.
6.7.102 Controls for use in or on ovens of the self-cleaning type.
6.7.103 Controls for use in or on food-handling appliances.
6.7.104 The non-bimetallic SODs are limited for use in appliances for heating or employing
liquids or steam. It is not suitable for instantaneous water heaters and storage water heaters.
6.8.3 Modification:
Replace the first paragraph by:
For an in-line cord control, a free standing control, an independently mounted control or a
control integrated or incorporated in an assembly utilizing a non-electrical energy source:
6.15 According to construction
Additional subclause:
6.15.101 – controls having parts containing liquid metal.
7 Information
This clause of Part 1 is applicable except as follows:
7.2 Methods of providing information
Table 1 – Required information and methods of providing information
Addition:
Clause or
Information Method
subclause
101 Maximum sensing element temperature (other than relevant to 6.7 X
6.15
requirement 105)
14.101
102 2.3.14.101 X
Time factor with or without sheath
11.101
BB.1.2
103 SOD reset temperature (either –35 °C or 0 °C) 2.2.101 X
11.4.103
17.15.2.3
104 Number of cycles for bimetallic SOD with 0 °C reset 17.15.1.3.1 X
105 Maximum sensing element temperature for the test of 17.16.107 (T ) 6.7.102 D
e
17.16.107
106 Controls having parts containing liquid metal 6.15.101 D
11.1.101
18.102
107 Tensile yield strength 11.1.101 X
108 Minimum current for the purpose of the test of 23.101 23.101 D
109 14.4.3.1 D
T is the maximum ambient temperature in which the control may remain continuously in
max.1
the operated condition so that Table 13 temperatures are not exceeded
110 Time period t is the maximum time during which the ambient temperature can be higher than 14.4.3.1 D
T after the control has operated
max.1
111 Temperature limit above which automatic reset of a manual reset thermal cut-out or a voltage 2.2.106 X
11.4.106
maintained thermal cut-out shall not occur (not higher than –20 °C)
17.16.104.1
17.16.108
112 For type 2.P controls, the method of test 17.101 X
113 The click rate N or switching operations per minute for the purposes of testing to CISPR 14-1 23 X
114 Rated functioning temperature (T ) 2.2.101.2.1 C
f
17.15.2
115 Ageing temperature for non-bimetallic SOD 17.15.2.2 D
17.15.2.3
116 Rate of rise of temperature for testing non-bimetallic SOD 17.15.2.2 D
17.15.2.3
117 Agricultural thermostat 2.2.107 D
6.4.3.106
11.4.107
11.6.3.101
Annex DD
– 14 – IEC 60730-2-9:2015 © IEC 2015
Additional footnotes:
This declaration applies only to temperature sensing controls containing liquid metal. For temperature sensing controls
used in or on self-cleaning ovens, this declaration is the temperature for the cooking operation.
In China, the use of liquid metal in or on cooking or food-handling equipment is not allowed.
In Germany, controls using liquid metal are allowed only with a special marking on the control. Documentation (D) shall
contain a clear warning of the actual danger that may occur. The following symbol shall be used for marking the control:
!
In Canada, the use of mercury is not allowed.
When no minimum is declared, the test value is 15 mA.
Consideration should be given to the provision of information by the equipment manufacturer relating to the minimum time
that the appliance has to be disconnected from the supply to allow a voltage maintained thermal cut-out to reset.
Determined by the control manufacturer based on the opening temperature of the thermal-cut-out.
Determined by the control manufacturer referring to the actual maximum rate of rise probable in the projected end-use
equipment.
8 Protection against electric shock
This clause of Part 1 is applicable.
9 Provision for protective earthing
This clause of Part 1 is applicable.
10 Terminals and terminations
This clause of Part 1 is applicable.
11 Constructional requirements
This clause of Part 1 is applicable except as follows:
11.1 Materials
Additional subclauses:
11.1.101 Parts containing liquid metal
For controls declared under Table 1, requirement 106, parts that contain mercury (Hg), and
parts of any control that contain sodium (Na), potassium (K), or both, shall be constructed
of metal that has a tensile yield strength at least four times the circumferential (hoop) or other
stress on the parts at a temperature 1,2 times the maximum temperature of the sensing
element (T ).
e
Compliance is checked by inspection of the manufacturer's declaration and by the test
of 18.102.
11.1.102 Material for non-bimetallic SODs
Insulating material used in non-bimetallic SODs as defined in this standard shall comply with
the requirements of IEC 60216-1:2013 and be suitable for the application.
Actuation and operation
11.3
11.3.9 Pull-cord actuated control
Addition:
NOTE 101 Note 2 is not applicable to controls classified as type 1.X or 2.X or type 1.Z or 2.Z.
11.4 Actions
11.4.3 Type 2 action
Additional subclauses:
11.4.3.101 Capacitors shall not be connected across the contacts of a thermal cut-out.
11.4.3.102 Constructions requiring a soldering operation to reset thermal cut-outs are not
permitted.
11.4.13 Type 1.K or 2.K action
Additional subclauses:
11.4.13.101 A type 2.K action shall be so designed that in the event of a break in the sensing
element, or in any other part between the sensing element and the switch head, the declared
disconnection or interruption is provided before the sum of the declared operating value and
drift is exceeded.
Compliance is checked by breaking the sensing element. The breaking may be achieved by
partly pre-cutting or filing through.
The temperature sensing control is heated to within 10 K of the operating temperature and the
temperature then increased at a rate not to exceed 1 K/min. The contacts shall open before the
sum of the declared operating value plus drift is exceeded.
11.4.13.102 Type 2.K action may also be achieved by compliance with a), b) or c).
a) Two sensing elements operating independently from each other and actuating one switch
head.
b) Bimetallic sensing elements with
1) exposed elements attached with at least double spot welding of the bimetal at both of its
ends, or
2) elements so located or installed in a control of such construction that the bimetal is not
likely to be physically damaged during installation and use.
c) If the loss of the fluid fill causes the contacts of the control to remain closed or leakage
causes upward shift beyond the declared maximum operating temperature, the bulb and
capillary of a temperature sensing control which is actuated by a change in the pressure
of a fluid confined in the bulb and capillary shall conform to the following.
There shall be no damage to the bulb or capillary to the extent which will permit escape of
any of the fill when an impact tool, as illustrated in Figure 101, is dropped once from a
height of 0,60 m so that the tapered end of the tool strikes the bulb or capillary in a
perpendicular position. For this test, the capillary or the bulb shall be on a concrete surface.
If the capillary is provided with a separate shroud or sleeve, it is to be left in place during
the test described above.
– 16 – IEC 60730-2-9:2015 © IEC 2015
Dimensions in millimetres
60°
R3,2
L
IEC
Material: Steel, CRS, Break all corners
L to be sized to obtain total mass of 0,454 kg
Figure 101 – Impact tool
Additional subclauses:
11.4.101 Type 2.N action
A type 2.N action shall be so designed that in the event of a leak in the sensing element, or in
any other part between the sensing element and the switch head, the declared disconnection
or interruption is provided before the sum of the declared operating value and drift is
exceeded.
Compliance is checked by the following test:
The operating value of a type 2.N control is measured under the conditions of Clause 15
of Part 1. If the control has means for setting, it is set to the highest value.
After this measurement, a hole is artificially produced in the sensing element and the
measurement of the operating value is repeated.
No positive drift is allowed above the declared value.
A separate shroud or sleeve may be employed for protection of the bulb and capillary to
achieve conformance with Clause 18.
NOTE 1 The test can be replaced by theoretical computations of the physical mode of operation.
NOTE 2 In Canada and the USA, a type 2.N action is checked by item c) of 11.4.13.102.
11.4.102 Type 2.P action
A type 2.P action shall be so designed that it operates in its intended manner after a thermal
cycling test.
Compliance is checked by the test of 17.101.
11.4.103 Bimetallic single-operation device
A bimetallic single-operation device shall be so designed that it does not reset above the
reset value declared in Table 1, requirement 103.
25,4 25,4
Compliance is checked by the test of 17.15.
11.4.104 Type 1.X or 2.X
A type 1.X or 2.X action shall be so designed that a turn action can only be accomplished after
the completion of a push-action or a pull-action. Only rotation shall be required to return the
actuating member of the control to the OFF position or rest position.
Compliance is checked by the tests of 18.101.
11.4.105 Type 1.Z or 2.Z
A type 1.Z or 2.Z action shall be so designed that a turn action can only be accomplished after
the completion of a push-action or a pull-action.
Compliance is checked by the tests of 18.101.
11.4.106 Voltage maintained thermal cut-out
A voltage maintained thermal cut-out shall be so designed that it does not reset above the
reset value declared in Table1, requirement 111.
11.4.107 Type 1.AM or 2.AM
A type 1.AM or 2.AM action shall be so designed that it operates in its intended manner after
the declared agricultural environmental exposures.
Compliance is checked by the tests of Annex DD.
11.6 Mounting of controls
11.6.3 Mounting of independently mounted controls
Additional subclause:
11.6.3.101 For agricultural thermostats declared in Table 1, requirement 117, the mounting
method shall be such that the integrity of the protection by the enclosure is not compromised.
Additional subclause:
11.101 Time factor
If a time factor is declared, this shall be checked by one of the applicable determining
methods as indicated in Annex BB. The determined value shall not exceed the rated values.
See Table BB.1.
NOTE In Germany, for temperature sensing controls intended to control boiler water or flue gas temperature in
heat generating systems, the maximum values of time factor given in Table BB.1 shall not be exceeded.
12 Moisture and dust resistance
This clause of Part 1 is applicable except as follows:
Additional subclauses:
– 18 – IEC 60730-2-9:2015 © IEC 2015
12.101 Refrigeration controls
Controls which have the switch head and sensing element mounted in the evaporator of
refrigeration or similar equipment, producing conditions of over temperature and of freezing
and melting, shall maintain insulation integrity.
12.101.1 Compliance is checked by the following tests.
12.101.2 Controls which use a potting compound are given a softening test. Two samples
are heated in a heating chamber at 15 K above the maximum declared operating temperature
for 16 h with the potting surface in the most unfavourable position. The potting material shall
not unduly soften or distort, crack or deteriorate.
12.101.3 The two samples used for the softening tests and one untested sample (three total)
are placed in water maintained between T (maximum declared switch head ambient
max
temperature) and either (T +5) °C or 1,05 times T , whichever is greater for 2 h. The
max max
three samples are then immediately transferred to water at a temperature of below 5 °C for 2 h
and then frozen in a small, flexible container at a temperature between T (minimum declared
min
switch head ambient temperature) and (T –5) °C for 2 h. Ten heating-freezing cycles are
min
required.
NOTE In Canada and the USA, if the contact mechanism of defrost controls has the creepage distances and
clearances required for refrigeration controllers, one cycle only of heating and freezing is required, otherwise
ten cycles are required.
12.101.4 The tested samples shall be left in water at room temperature overnight after each
completed heating-freezing cycle.
12.101.5 After the last freezing test, the samples are thawed to approximately room
temperature in water and the insulation resistance is measured from current-carrying parts to
grounded parts and to the surface of potting and/or insulating material; the direct current
Ω.
voltmeter method is used. Insulation resistance shall be at least 50 000
12.101.6 While the samples are still moist, a voltage equal to (2 × V ) + 1 000 V is applied at
R
rated frequency for 1 min between current-carrying parts and grounded parts and the surface
of the potting and/or insulating material. No flashover or breakdown of insulation shall occur
during the test.
13 Electric strength and insulation resistance
This clause of Part 1 is applicable except as follows:
13.2 Electric strength
Additional note:
NOTE 101 In the USA, an independently mounted room thermostat for operation over 50 V, intended for direct
control of electric space-heating equipment, shall withstand for 1 min without breakdown the application of
alternating potential of 900 V between the line and load terminals. A piece of insulating material may be placed
between the thermostat contacts during the test. There shall be no breakdown either through or across the
insulating material supporting the contact and terminal assemblies. This control shall be the control that is
designated as "SAMPLE 1" under the tests for compliance in 17.16.102.1 of this standard.
14 Heating
This clause of Part 1 is applicable except as follows:
14.4.3.1
Addition:
For a voltage maintained thermal cut-out, the heating test of 14.4.3.1 is completed, after
which the temperature of the sensing element is raised until the contacts open. At this time,
the ambient temperature surrounding the sensing element is reduced to T in time period
max.1
t , at a uniform rate. The test of 14.5.1 is then completed.
Additional subclause:
14.4.3.1.101 Where the whole control has been declared as the sensing element (see
Table 1, requirement 47), the heating test, at the request of the manufacturer, need not be
conducted until the successful completion of the tests in Clause 17.
Additional subclauses:
14.101 The following is applicable to controls classified under 6.7.101 to 6.7.103 inclusive.
14.101.1 As a means of complying with Note i) of Table 13, if the temperature of insulating
parts exceeds that permitted in Table 13, then the test of 17.16.101 may be conducted after the
conditioning of 14.102 and 14.102.1.
14.102 A previously untested sample of the control is conditioned for 1 000 h in an oven
maintained at a temperature between 1,02 T + 20 K and 1,05 times that temperature, where
T is the maximum measured temperature on the insulating part during the test of Clause 14.
The control shall not be energized during this test.
14.102.1 If the elevated temperature is localized, such as at or near a terminal, the 1 000 h
conditioning is conducted with the control between T and T + 5 % for normal conditions,
max max
but with the contacts closed and non-cycling. If necessary, the contacts may be forced closed
to provide the most arduous temperature conditions. A bimetal heater across the mains
is energized at 1,1 times rated voltage. A series bimetal heater shall conduct at 1,1 times rated
current.
15 Manufacturing deviation and drift
This clause of Part 1 is applicable except as follows:
15.1 Addition:
The values of manufacturing deviation and drift shall be according to Annex AA unless
otherwise declared by the manufacturer.
NOTE 101 The note is not applicable.
15.4 Addition:
Alternatively, the declared manufacturing deviation and drift may be expressed separately
as a tolerance value to the declared operating value.
15.5.3 Additional subclauses:
15.5.3.101 Controls intended for setting by the user shall be set at the maximum operating
temperature unless otherwise declared by the manufacturer.
...
IEC 60730-2-9 ®
Edition 4.1 2018-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - webstore.iec.ch/advsearchform IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60730-2-9 ®
Edition 4.1 2018-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.120 ISBN 978-2-8322-5331-1
IEC 60730-2-9 ®
Edition 4.1 2018-01
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
– 2 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
CONTENTS
FOREWORD . 4
1 Scope and normative references . 7
2 Terms and definitions. 8
3 General requirements . 10
4 General notes on tests . 10
5 Rating . 11
6 Classification . 11
7 Information . 12
8 Protection against electric shock . 14
9 Provision for protective earthing . 14
10 Terminals and terminations . 14
11 Constructional requirements . 14
12 Moisture and dust resistance. 17
13 Electric strength and insulation resistance . 18
14 Heating . 18
15 Manufacturing deviation and drift. 19
16 Environmental stress . 20
17 Endurance . 20
18 Mechanical strength . 26
19 Threaded parts and connections . 28
20 Creepage distances, clearances and distances through solid insulation . 28
21 Resistance to heat, fire and tracking . 28
22 Resistance to corrosion. 28
23 Electromagnetic compatibility (EMC) requirements – Emission . 28
24 Components . 29
25 Normal operation . 29
26 Electromagnetic compatibility (EMC) requirements – Immunity . 29
27 Abnormal operation . 29
28 Guidance on the use of electronic disconnection . 29
Annexes . 30
Annex G (normative) Heat and fire resistance tests . 30
Annex H (normative) Requirements for electronic controls . 31
Annex J (normative) Requirements for thermistor elements and controls using
thermistors . 38
a, b
Annex AA (informative) Maximum manufacturing deviation and drift . 39
Annex BB (informative) Time factor . 40
Annex CC (informative) Number of cycles. 43
Annex DD (normative) Controls for use in agricultural confinement buildings. 44
Annex EE (informative) Guide to the application of temperature sensing controls within
the scope of IEC 60730-2-9 . 47
Bibliography . 73
© IEC 2018
Figure 101 – Impact tool . 16
Figure 102 – Aluminium cylinder for temperature change method . 26
Figure BB.1 – Determination of time factor in the case of a sudden temperature change . 41
Figure BB.2 – Determination of time factor in the case of a linear rise of test-bath
temperature . 42
Figure EE.1 – Thermostat . 58
Figure EE.2 – Self-resetting temperature limiter . 59
Figure EE.3 – Non-self-resetting temperature limiter . 59
Figure EE.4 – Self-resetting thermal cut-out . 61
Figure EE.5 – Manual reset thermal cut-out . 61
Figure EE.6 – Single operation device . 63
Figure EE.7 – Three-stage control system . 64
Figure EE.8 – Schematic diagram showing usage of various controls approved to
IEC 60730-2-9 . 68
Table 1 – Required information and methods of providing information . 13
Table H.101 – Compliance criteria . 33
Table BB.1 – Method to determine and verify time factor values (see 11.101) . 42
Table EE.1 – Typical examples of the classification of temperature sensing controls in
accordance with IEC 60730-2-9 . 65
Table EE.2 – Examples of controls expected to operate during Clauses 11 and 19 of
IEC 60335 (all parts) . 69
Table EE.3 – Guidance on the common usage of types of control . 70
– 4 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been prepared
for user convenience.
IEC 60730-2-9 edition 4.1 contains the fourth edition (2015-05) [documents 72/990/FDIS and
72/998/RVD] and its amendment 1 (2018-01) [documents 72/1112A/FDIS and 72/1118/RVD].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions are in green text, deletions are in strikethrough red text.
A separate Final version with all changes accepted is available in this publication.
© IEC 2018
International Standard IEC 60730-2-9 has been prepared by technical committee TC 72:
Automatic electrical controls.
This fourth edition constitutes a technical revision.
This edition includes alignment with the text of 60730-1 fifth edition and the following significant
technical changes with respect to the previous edition:
a) modification of heating-freezing tests in Clause 12;
b) alignment of the EMC requirements in H.26 to those in other part 2 standards;
c) addition of requirements in Clause H.27 to cover class B and C control functions of
temperature sensing controls;
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-9 is intended to be used in conjunction with IEC 60730-1. It was established on the
basis of the fifth edition (2013) of that publication. Consideration may be given to future
editions of, or amendments to, IEC 60730-1.
This Part 2-9 supplements or modifies the corresponding clauses in IEC 60730-1 so as to
convert that publication into the IEC standard: Particular requirements for temperature sensing
controls.
Where this Part 2-9 states "addition", "modification", or "replacement", the relevant
requirement, test specification or explanatory matter in part 1 should be adapted accordingly.
Where no change is necessary, this part 2 indicates that the relevant clause or subclause
applies.
In the development of a fully international standard, it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The “in some countries” notes regarding differing national practices are contained in the
following subclauses:
4.1.101 17.8.4.101 Annex AA
7.2, Table 1 17.16.101 Clause CC.2
11.4.101 17.16.102 DD.9.2
11.101 17.16.105 EE.3.6
12.101.3 18.102.3
13.2 23.101
In this publication:
1) The following print types are used:
– Requirements proper: in roman type;
– Test specifications: in italic type;
– Notes; in small roman type;
– Words defined in Clause 2: bold.
2) Subclauses, notes, tables and figures which are additional to those in part 1 are numbered
starting from 101, additional annexes are lettered AA, BB, etc.
– 6 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
A list of all parts of the IEC 60730 series, published under the title Automatic electrical controls
can be found on the IEC website.
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
© IEC 2018
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
1 Scope and normative references
This clause of Part 1 is applicable except as follows:
1.1 Scope
Replacement:
This part of IEC 60730 applies to automatic electrical temperature sensing controls for use in,
on or in association with equipment, including electrical controls for heating, air-conditioning
and similar applications. The equipment may use electricity, gas, oil, solid fuel, solar thermal
energy, etc., or a combination thereof.
NOTE Throughout this standard, the word "equipment" includes "appliance" and "control system".
This standard is applicable to automatic electrical temperature sensing controls forming part
of a building automation control system within the scope of ISO 16484.
This standard also applies to automatic electrical temperature sensing controls for equipment
that may be used by the public, such as equipment intended to be used in shops, offices,
hospitals, farms and commercial and industrial applications.
This standard does not apply to automatic electrical temperature sensing controls intended
exclusively for industrial process applications, unless explicitly mentioned in the relevant
equipment standard.
1.1.1
Replacement:
This standard applies to the inherent safety, to the operating values, operating times, and
operating sequences where such are associated with equipment safety, and to the testing of
automatic electrical temperature sensing control devices used in, or in association with,
equipment.
NOTE Examples of such controls include boiler thermostats, fan controls, temperature limiters and thermal
cut-outs.
This standard is also applicable to the functional safety of low complexity safety-related
temperature sensing controls and systems.
1.1.2
Addition:
This standard also applies to the electrical safety of temperature sensing controls with non-
electrical outputs such as refrigerant flow and gas controls.
– 8 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
1.1.3 Not applicable.
1.1.4
Replacement:
This standard applies to manual controls when such are electrically and/or mechanically
integral with automatic temperature sensing controls.
NOTE Requirements for manual switches not forming part of an automatic control are contained in IEC 61058-1.
1.1.5
Replacement:
This standard applies to a.c. or d.c. powered temperature sensing controls with a rated
voltage not exceeding 690 V a.c. or 600 V d.c.
1.1.6
Replacement:
This standard does not take into account the response value of an automatic action of a
temperature sensing control, if such a response value is dependent upon the method of
mounting it in the equipment. Where a response value is of significant purpose for the
protection of the user, or surroundings, the value defined in the appropriate equipment
standard or as determined by the manufacturer shall apply.
1.1.7
Replacement:
This standard applies also to temperature sensing controls incorporating electronic devices,
requirements for which are contained in Annex H and to temperature sensing controls using
NTC thermistors or PTC thermistors, requirements for which are contained in Annex J.
Additional subclause:
1.1.101 This standard applies to single operation devices as defined in this standard.
1.1 Normative references
Addition:
IEC 60216-1:2013, Electrical insulating materials – Thermal endurance properties – Part 1:
Ageing procedures and evaluation of test results
IEC 60691, Thermal links – Requirements and application guide
IEC 60730-2-4, Automatic electrical controls for household and similar use – Part 2-4:
Particular requirements for thermal motor protectors for motor-compressors of hermetic and
semi-hermetic type
2 Terms and definitions
This clause of Part 1 is applicable except as follows:
© IEC 2018
2.2 Definitions of types of control according to purpose
2.2.19
operating control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermostat is an operating control.
2.2.20
protective control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermal cut-out is a protective control.
Additional definitions:
2.2.101
single-operation device
SOD
control having a temperature sensing element which is intended to operate only once and
then requires complete replacement
2.2.101.1
bimetallic single-operation device
single operation device (SOD) having a bimetallic temperature sensing element
Note 1 to entry: A bimetallic single operation device (SOD) does not reset above a declared temperature (see
11.4.103).
Note 2 to entry: Requirements for thermal links (which are not allowed to reset) are contained in IEC 60691.
2.2.101.2
non-bimetallic single-operation device
single operation device (SOD) having a temperature sensing element which is part of a
combination action control, the operation of which cannot be separated from other functions
of the control and having a non-bimetallic thermal element that operates only once and then
requires complete or partial replacement
Note 1 to entry: When such parts can be tested separately, they are considered to be thermal links within the
scope of IEC 60691.
Note 2 to entry: The ageing period and thermal response of the device is dependent on the intended use of the
device. As a result, the nature of the testing applicable to the device is representative of the application conditions
for which the protective control is intended (see 7.2).
Note 3 to entry: Non-bimetallic SODs provide the equivalent of micro-disconnection.
2.2.101.2.1
rated functioning temperature
T
f
temperature of the sensing element of a non-bimetallic SOD which causes it to change the
state of conductivity of the control when measured under specified conditions as declared by
the manufacturer
2.2.102
room thermostat
independently mounted or incorporated thermostat intended to control the temperature of
habitable space
– 10 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
2.2.103
fan control
automatic temperature sensing control intended to control the operation of a fan or blower
2.2.104
boiler thermostat
thermostat intended to control boiler/liquid temperature
2.2.105
modulating thermostat
thermostat which controls the temperature between two limits by continuously controlling the
input to the load
2.2.106
voltage maintained thermal cut-out
thermal cut-out which is maintained in its operated condition by the voltage which appears
across it in that condition
2.2.107
agricultural thermostat
thermostat intended for use in agricultural confinement buildings
2.3 Definitions relating to the function of controls
2.3.14 Additional definition:
2.3.14.101
time factor
transient response of temperature sensing controls by defined change of the activating
quantity
2.5 Definitions of types of control according to construction
Additional definitions:
2.5.101
push-and-turn actuation
two-step actuation accomplished by first pushing, then rotating the actuating member of the
control
2.5.102
pull-and-turn actuation
two-step actuation accomplished by first pulling, then rotating the actuating member of the
control
3 General requirements
This clause of Part 1 is applicable.
4 General notes on tests
4.1 Conditions of test
This clause of Part 1 is applicable except as follows:
© IEC 2018
4.1 Conditions of test
Additional subclauses:
4.1.101 For the purposes of the tests of this standard and unless otherwise indicated,
ambient temperature excursions beyond T during abnormal operation as a precursor to
max
the operation of a manual reset thermal cut-out or a bimetallic SOD are ignored.
NOTE In Canada and the USA, the preceding applies only to bimetallic SODs.
4.1.102 For manual reset thermal cut-outs and bimetallic SODs which have an operating
value above T , the temperature at the sensing element is raised, as necessary, to achieve
max
any cycling required during the tests.
4.2 amples required
4.2.1 Addition:
Six samples of bimetallic SODs are used for the test of Clause 15 and a further six for the test
of Clause 17.
5 Rating
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows:
6.4 According to features of automatic action
6.4.3 Additional subclauses:
6.4.3.101 – for sensing actions, no increase in the operating value as a result of any leakage
from the sensing element, or from parts connecting the sensing element to the switch head
(type 2.N);
6.4.3.102 – an action which operates after a declared thermal cycling test as specified
in 17.101 (type 2.P);
NOTE In general, thermal cut-outs for specific applications, such as pressurized water heating systems, may be
classified as having Type 2.P action.
6.4.3.103 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation and in which only rotation is required to return the actuating member to the
OFF position or rest position (type 1.X or 2.X);
6.4.3.104 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation (type 1.Z or 2.Z);
6.4.3.105 – an action which cannot be reset under electrically loaded conditions (type 1.AK
or 2.AK);
6.4.3.106 – an action which operates after declared agricultural environmental exposures
(type 1.AM or 2.AM).
– 12 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
6.7 According to ambient temperature limits of the switch head
Additional subclauses:
6.7.101 Controls for use in or on cooking appliances.
6.7.102 Controls for use in or on ovens of the self-cleaning type.
6.7.103 Controls for use in or on food-handling appliances.
6.7.104 The non-bimetallic SODs are limited for use in appliances for heating or employing
liquids or steam. It is not suitable for instantaneous water heaters and storage water heaters.
6.8.3 Modification:
Replace the first paragraph by:
For an in-line cord control, a free standing control, an independently mounted control or a
control integrated or incorporated in an assembly utilizing a non-electrical energy source:
6.15 According to construction
Additional subclause:
6.15.101 – controls having parts containing liquid metal.
7 Information
This clause of Part 1 is applicable except as follows:
© IEC 2018
7.2 Methods of providing information
Table 1 – Required information and methods of providing information
Addition:
Clause or
Information Method
subclause
101 Maximum sensing element temperature (other than relevant to 6.7 X
6.15
requirement 105)
14.101
102 2.3.14.101 X
Time factor with or without sheath
11.101
BB.1.2
103 SOD reset temperature (either –35 °C or 0 °C) 2.2.101 X
11.4.103
17.15.2.3
104 Number of cycles for bimetallic SOD with 0 °C reset 17.15.1.3.1 X
105 Maximum sensing element temperature for the test of 17.16.107 (T ) 6.7.102 D
e
17.16.107
106 Controls having parts containing liquid metal 6.15.101 D
11.1.101
18.102
107 Tensile yield strength 11.1.101 X
108 Minimum current for the purpose of the test of 23.101 23.101 D
109 14.4.3.1 D
T is the maximum ambient temperature in which the control may remain
max.1
continuously in the operated condition so that Table 13 temperatures are not
exceeded
110 Time period t is the maximum time during which the ambient temperature can be 14.4.3.1 D
higher than T after the control has operated
max.1
111 Temperature limit above which automatic reset of a manual reset thermal cut-out 2.2.106 X
or a voltage maintained thermal cut-out shall not occur (not higher than –20 °C) 11.4.106
17.16.104.1
17.16.108
112 For type 2.P controls, the method of test 17.101 X
113 The click rate N or switching operations per minute for the purposes of testing to 23 X
CISPR 14-1
114 ) 2.2.101.2.1 C
Rated functioning temperature (T
f
17.15.2
115 Ageing temperature for non-bimetallic SOD 17.15.2.2 D
17.15.2.3
116 Rate of rise of temperature for testing non-bimetallic SOD 17.15.2.2 D
17.15.2.3
117 Agricultural thermostat 2.2.107 D
6.4.3.106
11.4.107
11.6.3.101
Annex DD
– 14 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
Additional footnotes:
This declaration applies only to temperature sensing controls containing liquid metal. For temperature sensing
controls used in or on self-cleaning ovens, this declaration is the temperature for the cooking operation.
In China, the use of liquid metal in or on cooking or food -handling equipment is not allowed.
In Germany, controls using liquid metal are allowed only with a special marking on the control. Documentation
(D) shall contain a clear warning of the actual danger that may occur. The following symbol shall be used for
marking the control: !
In Canada, the use parts of controls containing mercury is not allowed.
When no minimum is declared, the test value is 15 mA.
Consideration should be given to the provision of information by the equipment manufacturer relating to the
minimum time that the appliance has to be disconnected from the supply to allow a voltage maintained thermal
cut-out to reset.
Determined by the control manufacturer based on the opening temperature of the thermal-cut-out.
Determined by the control manufacturer referring to the actual maximum rate of rise probable in the projected
end-use equipment.
8 Protection against electric shock
This clause of Part 1 is applicable.
9 Provision for protective earthing
This clause of Part 1 is applicable.
10 Terminals and terminations
This clause of Part 1 is applicable.
11 Constructional requirements
This clause of Part 1 is applicable except as follows:
11.1 Materials
Additional subclauses:
11.1.101 Parts containing liquid metal
For controls declared under Table 1, requirement 106, parts that contain mercury (Hg), and
parts of any control that contain sodium (Na), potassium (K), or both, shall be constructed
of metal that has a tensile yield strength at least four times the circumferential (hoop) or other
stress on the parts at a temperature 1,2 times the maximum temperature of the sensing
element (T ).
e
Compliance is checked by inspection of the manufacturer's declaration and by the test
of 18.102.
11.1.102 Material for non-bimetallic SODs
Insulating material used in non-bimetallic SODs as defined in this standard shall comply with
the requirements of IEC 60216-1:2013 and be suitable for the application.
© IEC 2018
11.3 Actuation and operation
11.3.9 Pull-cord actuated control
Addition:
NOTE 101 Note 2 is not applicable to controls classified as type 1.X or 2.X or type 1.Z or 2.Z.
11.4 Actions
11.4.3 Type 2 action
Additional subclauses:
11.4.3.101 Capacitors shall not be connected across the contacts of a thermal cut-out.
11.4.3.102 Constructions requiring a soldering operation to reset thermal cut-outs are not
permitted.
11.4.13 Type 1.K or 2.K action
Additional subclauses:
11.4.13.101 A type 2.K action shall be so designed that in the event of a break in the sensing
element, or in any other part between the sensing element and the switch head, the declared
disconnection or interruption is provided before the sum of the declared operating value and
drift is exceeded.
Compliance is checked by breaking the sensing element. The breaking may be achieved by
partly pre-cutting or filing through.
The temperature sensing control is heated to within 10 K of the operating temperature and the
temperature then increased at a rate not to exceed 1 K/min. The contacts shall open before the
sum of the declared operating value plus drift is exceeded.
11.4.13.102 Type 2.K action may also be achieved by compliance with a), b) or c).
a) Two sensing elements operating independently from each other and actuating one switch
head.
b) Bimetallic sensing elements with
1) exposed elements attached with at least double spot welding of the bimetal at both of its
ends, or
2) elements so located or installed in a control of such construction that the bimetal is not
likely to be physically damaged during installation and use.
c) If the loss of the fluid fill causes the contacts of the control to remain closed or leakage
causes upward shift beyond the declared maximum operating temperature, the bulb and
capillary of a temperature sensing control which is actuated by a change in the pressure
of a fluid confined in the bulb and capillary shall conform to the following.
There shall be no damage to the bulb or capillary to the extent which will permit escape of
any of the fill when an impact tool, as illustrated in Figure 101, is dropped once from a
height of 0,60 m so that the tapered end of the tool strikes the bulb or capillary in a
perpendicular position. For this test, the capillary or the bulb shall be on a concrete surface.
If the capillary is provided with a separate shroud or sleeve, it is to be left in place during
the test described above.
– 16 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
Dimensions in millimetres
60°
R3,2
L
IEC
Material: Steel, CRS, Break all corners
L to be sized to obtain total mass of 0,454 kg
Figure 101 – Impact tool
Additional subclauses:
11.4.101 Type 2.N action
A type 2.N action shall be so designed that in the event of a leak in the sensing element, or in
any other part between the sensing element and the switch head, the declared disconnection
or interruption is provided before the sum of the declared operating value and drift is
exceeded.
Compliance is checked by the following test:
The operating value of a type 2.N control is measured under the conditions of Clause 15
of Part 1. If the control has means for setting, it is set to the highest value.
After this measurement, a hole is artificially produced in the sensing element and the
measurement of the operating value is repeated.
No positive drift is allowed above the declared value.
A separate shroud or sleeve may be employed for protection of the bulb and capillary to
achieve conformance with Clause 18.
NOTE 1 The test can be replaced by theoretical computations of the physical mode of operation.
NOTE 2 In Canada and the USA, a type 2.N action is checked by item c) of 11.4.13.102.
11.4.102 Type 2.P action
A type 2.P action shall be so designed that it operates in its intended manner after a thermal
cycling test.
Compliance is checked by the test of 17.101.
11.4.103 Bimetallic single-operation device
A bimetallic single-operation device shall be so designed that it does not reset above the
reset value declared in Table 1, requirement 103.
25,4 25,4
© IEC 2018
Compliance is checked by the test of 17.15.
11.4.104 Type 1.X or 2.X
A type 1.X or 2.X action shall be so designed that a turn action can only be accomplished after
the completion of a push-action or a pull-action. Only rotation shall be required to return the
actuating member of the control to the OFF position or rest position.
Compliance is checked by the tests of 18.101.
11.4.105 Type 1.Z or 2.Z
A type 1.Z or 2.Z action shall be so designed that a turn action can only be accomplished after
the completion of a push-action or a pull-action.
Compliance is checked by the tests of 18.101.
11.4.106 Voltage maintained thermal cut-out
A voltage maintained thermal cut-out shall be so designed that it does not reset above the
reset value declared in Table1, requirement 111.
11.4.107 Type 1.AM or 2.AM
A type 1.AM or 2.AM action shall be so designed that it operates in its intended manner after
the declared agricultural environmental exposures.
Compliance is checked by the tests of Annex DD.
11.6 Mounting of controls
11.6.3 Mounting of independently mounted controls
Additional subclause:
11.6.3.101 For agricultural thermostats declared in Table 1, requirement 117, the mounting
method shall be such that the integrity of the protection by the enclosure is not compromised.
Additional subclause:
11.101 Time factor
If a time factor is declared, this shall be checked by one of the applicable determining
methods as indicated in Annex BB. The determined value shall not exceed the rated values.
See Table BB.1.
NOTE In Germany, for temperature sensing controls intended to control boiler water or flue gas temperature in
heat generating systems, the maximum values of time factor given in Table BB.1 shall not be exceeded.
12 Moisture and dust resistance
This clause of Part 1 is applicable except as follows:
Additional subclauses:
– 18 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
12.101 Refrigeration controls
Controls which have the switch head and sensing element mounted in the evaporator of
refrigeration or similar equipment, producing conditions of over temperature and of freezing
and melting, shall maintain insulation integrity.
12.101.1 Compliance is checked by the following tests.
12.101.2 Controls which use a potting compound are given a softening test. Two samples
are heated in a heating chamber at 15 K above the maximum declared operating temperature
for 16 h with the potting surface in the most unfavourable position. The potting material shall
not unduly soften or distort, crack or deteriorate.
12.101.3 The two samples used for the softening tests and one untested sample (three total)
are placed in water maintained between T (maximum declared switch head ambient
max
temperature) and either (T +5) °C or 1,05 times T , whichever is greater for 2 h. The
max max
three samples are then immediately transferred to water at a temperature of below 5 °C for 2 h
and then frozen in a small, flexible container at a temperature between T (minimum declared
min
switch head ambient temperature) and (T –5) °C for 2 h. Ten heating-freezing cycles are
min
required.
NOTE In Canada and the USA, if the contact mechanism of defrost controls has the creepage distances and
clearances required for refrigeration controllers, one cycle only of heating and freezing is required, otherwise
ten cycles are required.
12.101.4 The tested samples shall be left in water at room temperature overnight after each
completed heating-freezing cycle.
12.101.5 After the last freezing test, the samples are thawed to approximately room
temperature in water and the insulation resistance is measured from current-carrying parts to
grounded parts and to the surface of potting and/or insulating material; the direct current
Ω.
voltmeter method is used. Insulation resistance shall be at least 50 000
12.101.6 While the samples are still moist, a voltage equal to (2 × V ) + 1 000 V is applied at
R
rated frequency for 1 min between current-carrying parts and grounded parts and the surface
of the potting and/or insulating material. No flashover or breakdown of insulation shall occur
during the test.
13 Electric strength and insulation resistance
This clause of Part 1 is applicable except as follows:
13.2 Electric strength
Additional note:
NOTE 101 In the USA, an independently mounted room thermostat for operation over 50 V, intended for direct
control of electric space-heating equipment, shall withstand for 1 min without breakdown the application of
alternating potential of 900 V between the line and load terminals. A piece of insulating material may be placed
between the thermostat contacts during the test. There shall be no breakdown either through or across the
insulating material supporting the contact and terminal assemblies. This control shall be the control that is
designated as "SAMPLE 1" under the tests for compliance in 17.16.102.1 of this standard.
14 Heating
This clause of Part 1 is applicable except as follows:
© IEC 2018
14.4.3.1
Addition:
For a voltage maintained thermal cut-out, the heating test of 14.4.3.1 is completed, after
which the temperature of the sensing element is raised until the contacts open. At this time,
the ambient temperature surrounding the sensing element is reduced to T in time period
max.1
t , at a uniform rate. The test of 14.5.1 is then completed.
Additional subclause:
14.4.3.1.101 Where the whole control has been declared as the sensing element (see
Table 1, requirement 47), the heating test, at the request of the manufacturer, need not be
conducted until the successful completion of the tests in Clause 17.
Additional subclauses:
14.101 The following is applicable to controls classified under 6.7.101 to 6.7.103 inclusive.
14.101.1 As a means of complying with Note i) of Table 13, if the temperature of insula
...
IEC 60730-2-9 ®
Edition 4.2 2020-04
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and definitions clause of
IEC publications issued between 2002 and 2015. Some
IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
If you wish to give us your feedback on this publication or TC 37, 77, 86 and CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60730-2-9 ®
Edition 4.2 2020-04
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.120 ISBN 978-2-8322-8156-7
IEC 60730-2-9 ®
Edition 4.2 2020-04
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
– 2 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope and normative references . 7
2 Terms and definitions . 8
3 General requirements . 10
4 General notes on tests . 10
5 Rating. 11
6 Classification . 11
7 Information . 12
8 Protection against electric shock . 14
9 Provision for protective earthing . 14
10 Terminals and terminations . 14
11 Constructional requirements . 14
12 Moisture and dust resistance . 19
13 Electric strength and insulation resistance . 20
14 Heating . 20
15 Manufacturing deviation and drift . 21
16 Environmental stress . 22
17 Endurance . 22
18 Mechanical strength . 28
19 Threaded parts and connections . 29
20 Creepage distances, clearances and distances through solid insulation . 29
21 Resistance to heat, fire and tracking . 29
22 Resistance to corrosion . 29
23 Electromagnetic compatibility (EMC) requirements – Emission . 29
24 Components . 30
25 Normal operation . 30
26 Electromagnetic compatibility (EMC) requirements – Immunity . 30
27 Abnormal operation . 30
28 Guidance on the use of electronic disconnection . 31
Annexes . 32
Annex G (normative) Heat and fire resistance tests . 32
Annex H (normative) Requirements for electronic controls . 33
Annex J (normative) Requirements for thermistor elements and controls using
thermistors . 40
a, b
Annex AA (informative) Maximum manufacturing deviation and drift . 41
Annex BB (informative) Time factor . 42
Annex CC (informative) Number of cycles . 45
Annex DD (normative) Controls for use in agricultural confinement buildings . 46
Annex EE (informative) Guide to the application of temperature sensing controls within
the scope of IEC 60730-2-9 . 49
Bibliography . 75
+AMD2:2020 CSV © IEC 2020
Figure 101 – Impact tool . 17
Figure 102 – Aluminium cylinder for temperature change method . 27
Figure BB.1 – Determination of time factor in the case of a sudden temperature change . 43
Figure BB.2 – Determination of time factor in the case of a linear rise of test-bath
temperature . 44
Figure EE.1 – Thermostat . 60
Figure EE.2 – Self-resetting temperature limiter . 61
Figure EE.3 – Non-self-resetting temperature limiter . 61
Figure EE.4 – Self-resetting thermal cut-out. 63
Figure EE.5 – Manual reset thermal cut-out . 63
Figure EE.6 – Single operation device . 65
Figure EE.7 – Three-stage control system . 66
Figure EE.8 – Schematic diagram showing usage of various controls approved to
IEC 60730-2-9 . 70
Table 1 – Required information and methods of providing information . 13
Table H.101 – Compliance criteria . 35
Table BB.1 – Method to determine and verify time factor values (see 11.101) . 44
Table EE.1 – Typical examples of the classification of temperature sensing controls in
accordance with IEC 60730-2-9 . 67
Table EE.2 – Examples of controls expected to operate during Clauses 11 and 19 of
IEC 60335 (all parts) . 71
Table EE.3 – Guidance on the common usage of types of control . 72
– 4 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendments has been
prepared for user convenience.
IEC 60730-2-9 edition 4.2 contains the fourth edition (2015-05) [documents 72/990/FDIS
and 72/998/RVD], its amendment 1 (2018-01) [documents 72/1112A/FDIS and 72/1118/
RVD] and its amendment 2 (2020-04) [documents 72/1225/FDIS and 72/1236/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendments 1 and 2. Additions are in green text, deletions are in
strikethrough red text. A separate Final version with all changes accepted is available
in this publication.
+AMD2:2020 CSV © IEC 2020
International Standard IEC 60730-2-9 has been prepared by technical committee TC 72:
Automatic electrical controls.
This fourth edition constitutes a technical revision.
This edition includes alignment with the text of 60730-1 fifth edition and the following
significant technical changes with respect to the previous edition:
a) modification of heating-freezing tests in Clause 12;
b) alignment of the EMC requirements in H.26 to those in other part 2 standards;
c) addition of requirements in Clause H.27 to cover class B and C control functions of
temperature sensing controls;
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-9 is intended to be used in conjunction with IEC 60730-1. It was established on
the basis of the fifth edition (2013) of that publication. Consideration may be given to future
editions of, or amendments to, IEC 60730-1.
This Part 2-9 supplements or modifies the corresponding clauses in IEC 60730-1 so as to
convert that publication into the IEC standard: Particular requirements for temperature
sensing controls.
Where this Part 2-9 states "addition", "modification", or "replacement", the relevant
requirement, test specification or explanatory matter in part 1 should be adapted accordingly.
Where no change is necessary, this part 2 indicates that the relevant clause or subclause
applies.
In the development of a fully international standard, it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The “in some countries” notes regarding differing national practices are contained in the
following subclauses:
4.1.101 17.8.4.101 Annex AA
7.2, Table 1 17.16.101 Clause CC.2
11.4.101 17.16.102 DD.9.2
11.101 17.16.105 EE.3.6
12.101.3 18.102.3
13.2 23.101
In this publication:
1) The following print types are used:
– Requirements proper: in roman type;
– Test specifications: in italic type;
– Notes; in small roman type;
– Words defined in Clause 2: bold.
2) Subclauses, notes, tables and figures which are additional to those in part 1 are numbered
starting from 101, additional annexes are lettered AA, BB, etc.
– 6 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
A list of all parts of the IEC 60730 series, published under the title Automatic electrical
controls can be found on the IEC website.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
+AMD2:2020 CSV © IEC 2020
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
1 Scope and normative references
This clause of Part 1 is applicable except as follows:
1.1 Scope
Replacement:
This part of IEC 60730 applies to automatic electrical temperature sensing controls for use
in, on or in association with equipment, including electrical controls for heating, air-
conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel,
solar thermal energy, etc., or a combination thereof.
NOTE Throughout this standard, the word "equipment" includes "appliance" and "control system".
This standard is applicable to automatic electrical temperature sensing controls forming part
of a building automation control system within the scope of ISO 16484.
This standard also applies to automatic electrical temperature sensing controls for
equipment that may be used by the public, such as equipment intended to be used in shops,
offices, hospitals, farms and commercial and industrial applications.
This standard does not apply to automatic electrical temperature sensing controls intended
exclusively for industrial process applications, unless explicitly mentioned in the relevant
equipment standard.
1.1.1
Replacement:
This standard applies to the inherent safety, to the operating values, operating times, and
operating sequences where such are associated with equipment safety, and to the testing of
automatic electrical temperature sensing control devices used in, or in association with,
equipment.
NOTE Examples of such controls include boiler thermostats, fan controls, temperature limiters and thermal
cut-outs.
This standard is also applicable to the functional safety of low complexity safety-related
temperature sensing controls and systems.
1.1.2
Addition:
This standard also applies to the electrical safety of temperature sensing controls with non-
electrical outputs such as refrigerant flow and gas controls.
– 8 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
1.1.3 Not applicable.
1.1.4
Replacement:
This standard applies to manual controls when such are electrically and/or mechanically
integral with automatic temperature sensing controls.
NOTE Requirements for manual switches not forming part of an automatic control are contained in IEC 61058-1.
1.1.5
Replacement:
This standard applies to a.c. or d.c. powered temperature sensing controls with a rated
voltage not exceeding 690 V a.c. or 600 V d.c.
1.1.6
Replacement:
This standard does not take into account the response value of an automatic action of a
temperature sensing control, if such a response value is dependent upon the method of
mounting it in the equipment. Where a response value is of significant purpose for the
protection of the user, or surroundings, the value defined in the appropriate equipment
standard or as determined by the manufacturer shall apply.
1.1.7
Replacement:
This standard applies also to temperature sensing controls incorporating electronic
devices, requirements for which are contained in Annex H and to temperature sensing
controls using NTC thermistors or PTC thermistors, requirements for which are contained
in Annex J.
Additional subclause:
1.1.101 This standard applies to single operation devices as defined in this standard.
1.1 Normative references
Addition:
IEC 60216-1:2013, Electrical insulating materials – Thermal endurance properties – Part 1:
Ageing procedures and evaluation of test results
IEC 60691, Thermal links – Requirements and application guide
IEC 60730-2-4, Automatic electrical controls for household and similar use – Part 2-4:
Particular requirements for thermal motor protectors for motor-compressors of hermetic and
semi-hermetic type
2 Terms and definitions
This clause of Part 1 is applicable except as follows:
+AMD2:2020 CSV © IEC 2020
2.2 Definitions of types of control according to purpose
2.2.19
operating control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermostat is an operating control.
2.2.20
protective control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermal cut-out is a protective control.
Additional definitions:
2.2.101
single-operation device
SOD
control having a temperature sensing element which is intended to operate only once and
then requires complete replacement
2.2.101.1
bimetallic single-operation device
single operation device (SOD) having a bimetallic temperature sensing element
Note 1 to entry: A bimetallic single operation device (SOD) does not reset above a declared temperature (see
11.4.103).
Note 2 to entry: Requirements for thermal links (which are not allowed to reset) are contained in IEC 60691.
2.2.101.2
non-bimetallic single-operation device
single operation device (SOD) having a temperature sensing element which is part of a
combination action control, the operation of which cannot be separated from other functions
of the control and having a non-bimetallic thermal element that operates only once and then
requires complete or partial replacement
Note 1 to entry: When such parts can be tested separately, they are considered to be thermal links within the
scope of IEC 60691.
Note 2 to entry: The ageing period and thermal response of the device is dependent on the intended use of the
device. As a result, the nature of the testing applicable to the device is representative of the application conditions
for which the protective control is intended (see 7.2).
Note 3 to entry: Non-bimetallic SODs provide the equivalent of micro-disconnection.
2.2.101.2.1
rated functioning temperature
T
f
temperature of the sensing element of a non-bimetallic SOD which causes it to change the
state of conductivity of the control when measured under specified conditions as declared by
the manufacturer
2.2.102
room thermostat
independently mounted or incorporated thermostat intended to control the temperature of
habitable space
– 10 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
2.2.103
fan control
automatic temperature sensing control intended to control the operation of a fan or blower
2.2.104
boiler thermostat
thermostat intended to control boiler/liquid temperature
2.2.105
modulating thermostat
thermostat which controls the temperature between two limits by continuously controlling the
input to the load
2.2.106
voltage maintained thermal cut-out
thermal cut-out which is maintained in its operated condition by the voltage which appears
across it in that condition
2.2.107
agricultural thermostat
thermostat intended for use in agricultural confinement buildings
2.3 Definitions relating to the function of controls
2.3.14 Additional definition:
2.3.14.101
time factor
transient response of temperature sensing controls by defined change of the activating
quantity
2.5 Definitions of types of control according to construction
Additional definitions:
2.5.101
push-and-turn actuation
two-step actuation accomplished by first pushing, then rotating the actuating member of the
control
2.5.102
pull-and-turn actuation
two-step actuation accomplished by first pulling, then rotating the actuating member of the
control
3 General requirements
This clause of Part 1 is applicable.
4 General notes on tests
4.1 Conditions of test
This clause of Part 1 is applicable except as follows:
4.1 Conditions of test
+AMD2:2020 CSV © IEC 2020
Additional subclauses:
4.1.101 For the purposes of the tests of this standard and unless otherwise indicated,
ambient temperature excursions beyond T during abnormal operation as a precursor to
max
the operation of a manual reset thermal cut-out or a bimetallic SOD are ignored.
NOTE In Canada and the USA, the preceding applies only to bimetallic SODs.
4.1.102 For manual reset thermal cut-outs and bimetallic SODs which have an operating
value above T , the temperature at the sensing element is raised, as necessary, to
max
achieve any cycling required during the tests.
4.2 amples required
4.2.1 Addition:
Six samples of bimetallic SODs are used for the test of Clause 15 and a further six for the
test of Clause 17.
5 Rating
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows:
6.4 According to features of automatic action
6.4.3 Additional subclauses:
6.4.3.101 – for sensing actions, no increase in the operating value as a result of any
leakage from the sensing element, or from parts connecting the sensing element to the
switch head (type 2.N);
6.4.3.102 – an action which operates after a declared thermal cycling test as specified
in 17.101 (type 2.P);
NOTE In general, thermal cut-outs for specific applications, such as pressurized water heating systems, may be
classified as having Type 2.P action.
6.4.3.103 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation and in which only rotation is required to return the actuating member to the
OFF position or rest position (type 1.X or 2.X);
6.4.3.104 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation (type 1.Z or 2.Z);
6.4.3.105 – an action which cannot be reset under electrically loaded conditions (type 1.AK
or 2.AK);
6.4.3.106 – an action which operates after declared agricultural environmental exposures
(type 1.AM or 2.AM).
6.7 According to ambient temperature limits of the switch head
Additional subclauses:
– 12 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
6.7.101 Controls for use in or on cooking appliances.
6.7.102 Controls for use in or on ovens of the self-cleaning type.
6.7.103 Controls for use in or on food-handling appliances.
6.7.104 The non-bimetallic SODs are limited for use in appliances for heating or employing
liquids or steam. It is not suitable for instantaneous water heaters and storage water heaters.
6.8.3 Modification:
Replace the first paragraph by:
For an in-line cord control, a free standing control, an independently mounted control or a
control integrated or incorporated in an assembly utilizing a non-electrical energy source:
6.15 According to construction
Additional subclause:
6.15.101 – controls having parts containing liquid metal.
7 Information
This clause of Part 1 is applicable except as follows:
+AMD2:2020 CSV © IEC 2020
7.2 Methods of providing information
Table 1 – Required information and methods of providing information
Addition:
Clause or
Information Method
subclause
101 Maximum sensing element temperature (other than relevant to 6.7 X
requirement 105) 6.15
14.101
102 Time factor with or without sheath 2.3.14.101 X
11.101
BB.1.2
103 SOD reset temperature (either –35 °C or 0 °C) 2.2.101 X
11.4.103
17.15.2.3
104 Number of cycles for bimetallic SOD with 0 °C reset 17.15.1.3.1 X
105 Maximum sensing element temperature for the test of 17.16.107 (T ) 6.7.102 D
e
17.16.107
106 Controls having parts containing liquid metal 6.15.101 D
11.1.101
18.102
107 Tensile yield strength 11.1.101 X
108 Minimum current for the purpose of the test of 23.101 23.101 D
109 T is the maximum ambient temperature in which the control may remain 14.4.3.1 D
max.1
continuously in the operated condition so that Table 13 temperatures are not
exceeded
110 Time period t is the maximum time during which the ambient temperature can be 14.4.3.1 D
higher than T after the control has operated
max.1
111 Temperature limit above which automatic reset of a manual reset thermal cut-out 2.2.106 X
or a voltage maintained thermal cut-out shall not occur (not higher than –20 °C) 11.4.106
17.16.104.1
17.16.108
112 For type 2.P controls, the method of test 17.101 X
113 The click rate N or switching operations per minute for the purposes of testing to 23 X
CISPR 14-1
114 Rated functioning temperature (T ) 2.2.101.2.1 C
f
17.15.2
115 Ageing temperature for non-bimetallic SOD 17.15.2.2 D
17.15.2.3
116 Rate of rise of temperature for testing non-bimetallic SOD 17.15.2.2 D
17.15.2.3
2.2.107
117 Agricultural thermostat D
6.4.3.106
11.4.107
11.6.3.101
Annex DD
– 14 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
Additional footnotes:
This declaration applies only to temperature sensing controls containing liquid metal. For temperature sensing
controls used in or on self-cleaning ovens, this declaration is the temperature for the cooking operation.
In China, the use of liquid metal in or on cooking or food -handling equipment is not allowed.
In Germany, controls using liquid metal are allowed only with a special marking on the control. Documentation
(D) shall contain a clear warning of the actual danger that may occur. The following symbol shall be used for
marking the control: !
In Canada, the use parts of controls containing mercury is not allowed.
When no minimum is declared, the test value is 15 mA.
Consideration should be given to the provision of information by the equipment manufacturer relating to the
minimum time that the appliance has to be disconnected from the supply to allow a voltage maintained thermal
cut-out to reset.
Determined by the control manufacturer based on the opening temperature of the thermal-cut-out.
Determined by the control manufacturer referring to the actual maximum rate of rise probable in the projected
end-use equipment.
8 Protection against electric shock
This clause of Part 1 is applicable.
9 Provision for protective earthing
This clause of Part 1 is applicable.
10 Terminals and terminations
This clause of Part 1 is applicable.
11 Constructional requirements
This clause of Part 1 is applicable except as follows:
11.1 Materials
Additional subclauses:
11.1.101 Parts containing liquid metal
For controls declared under Table 1, requirement 106, parts that contain mercury (Hg), and
parts of any control that contain sodium (Na), potassium (K), or both, shall be constructed
of metal that has a tensile yield strength at least four times the circumferential (hoop) or other
stress on the parts at a temperature 1,2 times the maximum temperature of the sensing
element (T ).
e
Compliance is checked by inspection of the manufacturer's declaration and by the test
of 18.102.
11.1.102 Material for non-bimetallic SODs
Insulating material used in non-bimetallic SODs as defined in this standard shall comply with
the requirements of IEC 60216-1:2013 and be suitable for the application.
+AMD2:2020 CSV © IEC 2020
11.3 Actuation and operation
11.3.9 Pull-cord actuated control
Addition:
NOTE 101 Note 2 is not applicable to controls classified as type 1.X or 2.X or type 1.Z or 2.Z.
11.4 Actions
11.4.3 Type 2 action
Additional subclauses:
11.4.3.101 Capacitors shall not be connected across the contacts of a thermal cut-out.
11.4.3.102 Constructions requiring a soldering operation to reset thermal cut-outs are not
permitted.
11.4.11 Type 1.H or 2.H action
Additional subclauses:
11.4.11.101 For this test, the reset mechanism of the control will be held in the reset
position for the duration of the test from 11.4.11.102 to 11.4.11.104. The verification of the
automatic non-resetting above –35 °C will be carried out by 11.4.11.105 to 11.4.11.106. For
SOD, the verification of the automatic non-resetting above either +0 °C or –35 °C will be
carried out by 11.4.11.105 to 11.4.11.106, as declared in item 103 of Table 1.
11.4.11.102 With the reset mechanism held in the reset position at room temperature,
continuity across contacts is observed by a low-energy circuit, 0,05 A maximum.
11.4.11.103 The control’s sensing element is then installed in an air circulating chamber or
an oil bath and the control’s switch head is installed as in 14.5.1. When the whole control is
declared as the sensing element, the whole control is placed in an air-circulating chamber.
The control or the control’s sensing element is adjusted for the maximum set point
temperature. The chamber or oil bath temperature shall be determined by positioning a
thermocouple wire adjacent to the control under test. The chamber or oil bath temperature is
then raised from room temperature and held at approximately 10 K below the set point until
temperatures stabilize. The chamber or oil bath temperature is then raised at a rate of not
more than 0,5 K per minute until the contact operates. Indication of contact separation is
observed by applying the method of 11.4.11.102.
11.4.11.104 After the control has operated and with the reset mechanism still held in the
reset position, the temperature of the chamber or oil bath is then reduced to determine if the
control automatically resets. Verification of contact closure is done by applying the method in
11.4.11.102.
11.4.11.105 The whole control or the control’s sensing element is then installed in an air
circulating chamber or oil bath again and the control’s switch head (if applicable) is installed
as in 14.5.1 with the reset mechanism in its normal condition. The chamber or oil bath
temperature shall be determined by positioning a thermocouple wire adjacent to the control
under test. The chamber or coil bath temperature is raised from room temperature and held at
approximately 10 K below the set point until temperatures stabilize. The chamber or oil bath
temperature is then raised at a rate of not more than 0,5 K per minute until the contact
operates. Indication of contact separation is observed by applying the method of 11.4.11.102.
– 16 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
11.4.11.106 After the control has operated, the temperature of the chamber is allowed to
cool down to either +0 °C or –35 °C. Indication of contact separation is observed by applying
the method of 11.4.11.102.
11.4.12 Type 1.J or 2.J action
Additional subclauses:
11.4.12.101 For this test, the reset mechanism of the control will be held in the reset
position for the duration of the test from 11.4.12.102 to 11.4.12.104. The verification of the
automatic non-resetting above –35 °C will be carried out by 11.4.12.105 to 11.4.12.106. For
SOD, the verification of the automatic non-resetting above either +0 °C or –35 °C will be
carried out by 11.4.12.105 to 11.4.12.106, as declared in item 103 of Table 1.
11.4.12.102 With the reset mechanism held in the reset position at room temperature,
contact separation is observed by a low-energy circuit, 0,05 A maximum.
11.4.12.103 The control’s sensing element is then installed in an air circulating chamber or
oil bath and the control’s switch head is installed as in 14.5.1. When the whole control is
declared as the sensing element, the whole control is placed in an air-circulating chamber.
The control or the control’s sensing element is adjusted for the maximum set point
temperature. The chamber or oil bath temperature shall be determined by positioning a
thermocouple wire adjacent to the control under test. The chamber or oil bath temperature is
raised from room temperature and held at approximately 10 K below the set point until
temperatures stabilize. The chamber or oil bath temperature is then raised at a rate of not
more than 0,5 K per minute until 10 K over the operation temperature. Indication of contact
separation is still observed by applying the method of 11.4.11.102.
11.4.12.104 After the control has operated and with the reset mechanism still held in the
reset position, the temperature of the chamber or oil bath is then reduced to determine if the
control automatically resets. Verification of contact closure is done by applying the method in
11.4.11.102.
11.4.12.105 The whole control or the control’s sensing element is then installed in an air
circulating chamber or oil bath again and the control’s switch head (if applicable) is installed
as in 14.5.1. with the reset mechanism in its normal condition. The chamber or oil bath
temperature shall be determined by positioning a thermocouple wire adjacent to the control
under test. The chamber or oil bath temperature is raised from room temperature and held at
approximately 10 K below the set point until temperatures stabilize. The chamber or oil bath
temperature is then raised at a rate of not more than 0,5 K per minute until the contact
operates. Indication of contact separation is observed by applying the method of 11.4.11.102.
11.4.12.106 After the control has operated, the temperature of the chamber or oil bath is
allowed to cool down to either +0 °C or –35 °C. Indication of contact separation is observed
by applying the method of 11.4.11.102.
11.4.13 Type 1.K or 2.K action
Additional subclauses:
11.4.13.101 A type 2.K action shall be so designed that in the event of a break in the
sensing element, or in any other part between the sensing element and the switch head,
the declared disconnection or interruption is provided before the sum of the declared
operating value and drift is exceeded.
Compliance is checked by breaking the sensing element. The breaking may be achieved by
partly pre-cutting or filing through.
+AMD2:2020 CSV © IEC 2020
The temperature sensing control is heated to within 10 K of the operating temperature and
the temperature then increased at a rate not to exceed 1 K/min. The contacts shall open
before the sum of the declared operating value plus drift is exceeded.
11.4.13.102 Type 2.K action may also be achieved by compliance with a), b) or c).
a) Two sensing elements operating independently from each other and actuating one switch
head.
b) Bimetallic sensing elements with
1) exposed elements attached with at least double spot welding of the bimetal at both of
its ends, or
2) elements so located or installed in a control of such construction that the bimetal is
not likely to be physically damaged during installation and use.
c) If the loss of the fluid fill causes the contacts of the control to remain closed or leakage
causes upward shift beyond the declared maximum operating temperature, the bulb and
capillary of a temperature sensing control which is actuated by a change in the pressure
of a fluid confined in the bulb and capillary shall conform to the following.
There shall be no damage to the bulb or capillary to the extent which will permit escape of
any of the fill when an impact tool, as illustrated in Figure 101, is dropped once from a
height of 0,60 m so that the tapered end of the tool strikes the bulb or capillary in a
perpendicular position. For this test, the capillary or the bulb shall be on a concrete
surface.
If the capillary is provided with a separate shroud or sleeve, it is to be left in place during
the test described above.
Dimensions in millimetres
60°
R3,2
L
IEC
Material: Steel, CRS, Break all corners
L to be sized to obtain total mass of 0,454 kg
Figure 101 – Impact tool
Additional subclauses:
11.4.101 Type 2.N action
A type 2.N action shall be so designed that in the event of a leak in the sensing element, or
in any other part between the sensing element and the switch head, the declared
disconnection or interruption is provided before the sum of the declared operating value and
drift is exceeded.
Compliance is checked by the following test:
25,4 25,4
– 18 – IEC 60730-2-9:2015+AMD1:2018
+AMD2:2020 CSV © IEC 2020
The operating value of a type 2.N control is measured under the conditions of Clause 15
of Part 1. If the control has means for setting, it is set to the highest value.
After this measurement, a hole is artificially produced in the sensing element and the
measurement of the operating value is repeated.
No positive drift is allowed above the declared value.
A separate shroud or sleeve may be employed for protection of the bulb and capillary to
achieve conformance with Clause 18.
NOTE 1 The test can be replaced by theoretical computations of the physical mode of operation.
NOTE 2 In Canada and the USA, a type 2.N action is checked by item c) of 11.4.13.102.
11.4.102 Type 2.P action
A type 2.P action shall be so designed that it operates in its intended manner after a thermal
cycling test.
Compliance is checked by the test of 17.101.
11.4.103 Bimetallic single-operation device
A bimetallic single-operation device shall be so designed that it does not reset above the
reset value declared in Table 1, requirement 103.
Compliance is checked by the test of 17.15.
11.4.104 Type 1.X or 2.X
A type 1.X or 2.X action shall be so designed that a turn action can only be accomplished
after the completion of a push-action or a pull-action. Only rotation shall be required to return
the actuating member of the control to the OFF position or rest position.
Compliance is checked by the tests of 18.101.
11.4.105 Type 1.Z or
...
IEC 60730-2-9 ®
Edition 4.0 2015-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
IEC 60730-2-9 ®
Edition 4.0 2015-05
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.120 ISBN 978-2-8322-2714-5
– 2 – IEC 60730-2-9:2015 RLV © IEC 2015
CONTENTS
FOREWORD . 4
1 Scope and normative references . 7
2 Terms and definitions . 9
3 General requirements . 11
4 General notes on tests . 11
5 Rating . 11
6 Classification . 11
7 Information . 12
8 Protection against electric shock . 14
9 Provision for protective earthing . 14
10 Terminals and terminations . 14
11 Constructional requirements . 14
12 Moisture and dust resistance . 17
13 Electric strength and insulation resistance . 18
14 Heating . 19
15 Manufacturing deviation and drift . 19
16 Environmental stress . 20
17 Endurance . 21
18 Mechanical strength . 26
19 Threaded parts and connections . 28
20 Creepage distances, clearances and distances through solid insulation . 28
21 Fire hazard testing Resistance to heat, fire and tracking . 28
22 Resistance to corrosion . 28
23 Electromagnetic compatibility (EMC) requirements – Emission . 28
24 Components . 29
25 Normal operation . 29
26 Electromagnetic compatibility (EMC) requirements – Immunity . 29
27 Abnormal operation . 29
28 Guidance on the use of electronic disconnection . 29
Annexes . 30
Annex G (normative) Heat and fire resistance tests . 30
Annex H (normative) Requirements for electronic controls . 31
Annex J (normative) Requirements for thermistor elements and controls using
thermistors . 38
Annex AA (informative) Maximum manufacturing deviation and drift . 39
Annex BB (informative) Time factor . 40
Annex CC (informative) Number of cycles. 43
Annex DD (normative) Controls for use in agricultural confinement buildings. 44
Annex EE (informative) Guide to the application of temperature sensing controls within
the scope of IEC 60730-2-9 . 48
Bibliography . 64
Figure 11.4.13.102 101 – Impact tool . 16
Figure 17.101.3 102 – Aluminium cylinder for temperature change method . 26
Figure BB.1 – Determination of time factor in the case of a sudden temperature change . 41
Figure BB.2 – Determination of time factor in the case of a linear rise of test-bath
temperature . 42
Figure EE.1 – Thermostat . 56
Figure EE.2 – Self-resetting temperature limiter . 57
Figure EE.3 – Non-self-resetting temperature limiter . 58
Figure EE.4 – Self-resetting thermal cut-out . 59
Figure EE.5 – Manual reset thermal cut-out . 59
Figure EE.6 – Single operation device . 61
Figure EE.7 – Three-stage control system . 62
Table 1 – Required information and methods of providing information . 13
Table H.26.2.101 H.101 – Compliance criteria . 33
Table BB.1 – Method to determine and verify time factor values (see 11.101) . 42
Table EE.1 – Typical examples of the classification of temperature sensing controls in
accordance with IEC 60730-2-9 . 63
– 4 – IEC 60730-2-9:2015 RLV © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
International Standard IEC 60730-2-9 has been prepared by technical committee TC 72:
Automatic electrical controls.
The text of this standard is based on the following documents:
FDIS Report on voting
72/990/FDIS 72/998/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This fourth edition cancels and replaces the third edition published in 2008, and its
Amendment 1:2011. This edition constitutes a technical revision. This edition includes
alignment with the text of 60730-1 fifth edition and the following significant technical changes
with respect to the previous edition:
a) modification of heating-freezing tests in Clause 12;
b) alignment of the EMC requirements in H.26 to those in other part 2 standards;
c) addition of requirements in Clause H.27 to cover class B and C control functions of
temperature sensing controls;
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-9 is intended to be used in conjunction with IEC 60730-1. It was established on the
basis of the fifth edition (2013) of that publication. Consideration may be given to future
editions of, or amendments to, IEC 60730-1.
This Part 2-9 supplements or modifies the corresponding clauses in IEC 60730-1 so as to
convert that publication into the IEC standard: Particular requirements for temperature sensing
controls.
Where this Part 2-9 states "addition", "modification", or "replacement", the relevant
requirement, test specification or explanatory matter in part 1 should be adapted accordingly.
Where no change is necessary, this part 2 indicates that the relevant clause or subclause
applies.
In the development of a fully international standard, it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The “in some countries” notes regarding differing national practices are contained in the
following subclauses:
4.1.101 17.8.4.101 Annex AA
7.2, Table 1 17.16.101 Clause CC.2
11.4.101 17.16.102 DD.9.2
11.101 17.16.105 EE.3.6
12.101.3 18.102.3
13.2 23.101
In this publication:
1) The following print types are used:
– 6 – IEC 60730-2-9:2015 RLV © IEC 2015
– Requirements proper: in roman type;
– Test specifications: in italic type;
– Notes; in small roman type;
– Words defined in Clause 2: bold.
2) Subclauses, notes, tables and figures which are additional to those in part 1 are numbered
starting from 101, additional annexes are lettered AA, BB, etc.
A list of all parts of the IEC 60730 series, published under the title Automatic electrical controls
can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.
AUTOMATIC ELECTRICAL CONTROLS –
FOR HOUSEHOLD AND SIMILAR USE –
Part 2-9: Particular requirements for temperature sensing controls
1 Scope and normative references
This clause of Part 1 is applicable except as follows:
1.1 Scope
Replacement:
This part of IEC 60730 applies to automatic electrical temperature sensing controls for use in,
on or in association with equipment for household and similar use, including electrical
controls for heating, air-conditioning and similar applications. The equipment may use
electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof.
NOTE Throughout this standard, the word "equipment" includes "appliance" and "control system".
This standard is applicable to automatic electrical temperature sensing controls forming part
of a building automation control system within the scope of ISO 16484.
This standard also applies to automatic electrical temperature sensing controls for equipment
that may be used by the public, such as equipment intended to be used in shops, offices,
hospitals, farms and commercial and industrial applications.
This standard does not apply to automatic electrical temperature sensing controls intended
exclusively for industrial process applications, unless explicitly mentioned in the relevant
equipment standard.
1.1.1 Replace the explanatory matter with the following new explanatory matter:
Replacement:
This standard applies to the inherent safety, to the operating values, operating times, and
operating sequences where such are associated with equipment safety, and to the testing of
automatic electrical temperature sensing control devices used in, or in association with,
equipment.
NOTE Examples of such controls include boiler thermostats, fan controls, temperature limiters and thermal
cut-outs.
Throughout This standard, the word "equipment" includes "appliance" and "control system".
This standard is also applicable to the functional safety of low complexity safety-related
temperature sensing controls and systems.
1.1.2 Replacement:
Addition:
This standard also applies to the electrical safety of temperature sensing controls with non-
electrical outputs such as refrigerant flow and gas controls.
– 8 – IEC 60730-2-9:2015 RLV © IEC 2015
1.1.3 Not applicable.
1.1.4
Replacement:
This standard applies to manual controls when such are electrically and/or mechanically
integral with automatic temperature sensing controls.
NOTE Requirements for manual switches not forming part of an automatic control are contained in IEC 61058-1.
1.1.5
Replacement:
This standard applies to a.c. or d.c. powered temperature sensing controls with a rated
voltage not exceeding 690 V a.c. or 600 V d.c.
1.1.6
Replacement:
This standard does not take into account the response value of an automatic action of a
temperature sensing control, if such a response value is dependent upon the method of
mounting it in the equipment. Where a response value is of significant purpose for the
protection of the user, or surroundings, the value defined in the appropriate equipment
standard or as determined by the manufacturer shall apply.
1.1.7
Replacement:
This standard applies also to temperature sensing controls incorporating electronic devices,
requirements for which are contained in Annex H and to temperature sensing controls using
NTC thermistors or PTC thermistors, requirements for which are contained in Annex J.
Additional subclause:
1.1.101 This standard applies to single operation devices as defined in this standard.
1.1 Normative references
Addition:
IEC 60335 (all parts), Household and similar electrical appliances – Safety
IEC 60216-1:2013, Electrical insulating materials – Thermal endurance properties – Part 1:
Ageing procedures and evaluation of test results
IEC 60691:2002, Thermal links – Requirements and application guide
Amendment 1 (2006)
IEC 60730-2-4, Automatic electrical controls for household and similar use – Part 2-4:
Particular requirements for thermal motor protectors for motor-compressors of hermetic and
semi-hermetic type
2 Terms and definitions
This clause of Part 1 is applicable except as follows:
2.2 Definitions of types of control according to purpose
2.2.19
operating control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermostat is an operating control.
2.2.20
protective control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermal cut-out is a protective control.
Additional definitions:
2.2.101
single-operation device
SOD
control having a temperature sensing element which is intended to operate only once and
then requires complete replacement
2.2.101.1
bimetallic single-operation device
single operation device (SOD) having a bimetallic temperature sensing element
Note 1 to entry: A bimetallic single operation device (SOD) does not reset above a declared temperature (see
11.4.103).
Note 2 to entry: Requirements for thermal links (which are not allowed to reset) are contained in IEC 60691.
2.2.101.2
non-bimetallic single-operation device
single operation device (SOD) having a temperature sensing element which is part of a
combination action control, the operation of which cannot be separated from other functions
of the control and having a non-bimetallic sensing thermal element that operates only once
and then requires complete or partial replacement
Note 1 to entry: When such parts can be tested separately, they are considered to be thermal links within the
scope of IEC 60691.
Note 2 to entry: The ageing period and thermal response of the device is dependent on the intended use of the
device. As a result, the nature of the testing applicable to the device is representative of the application conditions
for which the protective control is intended (see 7.2).
Note 3 to entry: Non-bimetallic SODs provide the equivalent of micro-disconnection.
2.2.101.2.1
rated functioning temperature
T
f
temperature of the sensing element of a non-bimetallic SOD which causes it to change the
state of conductivity of the control when measured under specified conditions as declared by
the manufacturer
– 10 – IEC 60730-2-9:2015 RLV © IEC 2015
2.2.101.2.2
holding temperature
T
c
maximum temperature of the sensing element of a non-bimetallic SOD at which it will not
cause the control to change its state of conductivity during a specified time under specified
conditions as declared by the manufacturer
2.2.101.2.3
maximum temperature limit
T
m
temperature of the sensing element of a non-bimetallic SOD, stated by the manufacturer, up to
which the mechanical and electrical properties of the control having changed its state of
conductivity will not be impaired for a given time
2.2.102
room thermostat
independently mounted or incorporated thermostat intended to control the temperature of
habitable space
2.2.103
fan control
automatic temperature sensing control intended to control the operation of a fan or blower
2.2.104
boiler thermostat
thermostat intended to control boiler/liquid temperature
2.2.105
modulating thermostat
thermostat which controls the temperature between two limits by continuously controlling the
input to the load
2.2.106
voltage maintained thermal cut-out
thermal cut-out which is maintained in its operated condition by the voltage which appears
across it in that condition
2.2.107
agricultural thermostat
thermostat intended for use in agricultural confinement buildings
2.3 Definitions relating to the function of controls
2.3.14 Additional definition:
2.3.14.101
time factor
transient response of temperature sensing controls by defined change of the activating
quantity
2.5 Definitions of types of control according to construction
Additional definitions:
2.5.101
push-and-turn actuation
two-step actuation accomplished by first pushing, then rotating the actuating member of the
control
2.5.102
pull-and-turn actuation
two-step actuation accomplished by first pulling, then rotating the actuating member of the
control
3 General requirements
This clause of Part 1 is applicable.
4 General notes on tests
4.1 Conditions of test
This clause of Part 1 is applicable except as follows:
4.1.7 Not applicable.
4.1 Conditions of test
Additional subclauses:
4.1.101 For the purposes of the tests of this standard and unless otherwise indicated,
ambient temperature excursions beyond T during abnormal operation as a precursor to
max
the operation of a manual reset thermal cut-out or a bimetallic SOD are ignored.
NOTE In Canada and the USA, the preceding applies only to bimetallic SODs.
4.1.102 For manual reset thermal cut-outs and bimetallic SODs which have an operating
value above T , the temperature at the sensing element is raised, as necessary, to achieve
max
any cycling required during the tests.
4.2 Samples required
4.2.1 Addition:
Six samples of bimetallic SODs are used for the test of Clause 15 and a further six for the test
of Clause 17.
Additional samples are required for the tests of Clause 17.
5 Rating
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows:
– 12 – IEC 60730-2-9:2015 RLV © IEC 2015
6.4 According to features of automatic action
6.4.3 Additional subclauses:
6.4.3.101 – for sensing actions, no increase in the operating value as a result of any leakage
from the sensing element, or from parts connecting the sensing element to the switch head
(type 2.N);
6.4.3.102 – an action which operates after a declared thermal cycling test as specified
in 17.101 (type 2.P);
NOTE In general, thermal cut-outs for specific applications, such as pressurized water heating systems, may be
classified as having Type 2.P action.
6.4.3.103 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation and in which only rotation is required to return the actuating member to the
OFF position or rest position (type 1.X or 2.X);
6.4.3.104 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation (type 1.Z or 2.Z);
6.4.3.105 – an action which cannot be reset under electrically loaded conditions (type 1.AK
or 2.AK);
6.4.3.106 – an action which operates after declared agricultural environmental exposures
(type 1.AM or 2.AM).
6.7 According to ambient temperature limits of the switch head
Additional subclauses:
6.7.101 Controls for use in or on cooking appliances.
6.7.102 Controls for use in or on ovens of the self-cleaning type.
6.7.103 Controls for use in or on food-handling appliances.
6.7.104 The non-bimetallic SODs are limited for use in appliances for heating or employing
liquids or steam. It is not suitable for instantaneous water heaters and storage water heaters.
6.8.3 Modification:
Replace the first paragraph by:
For an in-line cord control, a free standing control, an independently mounted control or a
control integrated or incorporated in an assembly utilizing a non-electrical energy source:
6.15 According to construction
Additional subclause:
6.15.101 – controls having parts containing liquid metal.
7 Information
This clause of Part 1 is applicable except as follows:
7.2 Methods of providing information
Table 7.2
Table 1 – Required information and methods of providing information
Addition:
Clause or Metho
Information
subclause d
101 Maximum sensing element temperature (other than relevant to 6.7 X
6.15
requirement 105)
14.101
102 Time factor with or without sheath ref. 2.3.14.101 X
11.101
BB.1.2
103 2.2.101 11.4.103 X
SOD reset temperature (either –35 °C or 0 °C)
17.15.2.3
104 17.15.1.3.1 X
Number of cycles for bimetallic SOD with 0 °C reset
105 6.7.102 17.16.107 D
Maximum sensing element temperature for the test of 17.16.107 (T )
e
106 Controls having parts containing liquid metal 6.15.101 11.1.101 D
18.102
107 Tensile yield strength 11.1.101 X
108 Minimum current for the purpose of the test of 23.101 23.101 D
109 T is the maximum ambient temperature in which the control may remain 14.4.3.1 D
max.1
continuously in the operated condition so that Table 13 temperatures are not exceeded
110 Time period t is the maximum time during which the ambient temperature can be higher 14.4.3.1 D
than T after the control has operated
max.1
111 Temperature limit above which automatic reset of a manual reset thermal cut-out or a 2.2.106 X
voltage maintained thermal cut-out shall not occur (not higher than –20 °C) 11.4.106
17.16.104.1
17.16.108
112 For type 2.P controls, the method of test 17.101 X
113 23 X
The click rate N or switching operations per minute for the purposes of testing to
CISPR 14-1
114 Rated functioning temperature (T ) 2.2.101.2.1 C
f
17.15.2
115 Holding Ageing temperature (T ) for non-bimetallic SOD 2.2.101.2.2 D
c
17.15.2.2
17.15.2.3
116 Maximum Rate of rise of temperature limit (T ) for testing non-bimetallic SOD 2.2.101.2.3 D
m
17.15.2.2
17.15.2.3
117 Agricultural thermostat 2.2.107 D
6.4.3.106
11.4.107
11.6.3.101
Annex DD
– 14 – IEC 60730-2-9:2015 RLV © IEC 2015
NOTES
Additional footnotes:
This declaration applies only to temperature sensing controls containing liquid metal. For temperature sensing controls
used in or on self-cleaning ovens, this declaration is the temperature for the cooking operation.
In China, the use of liquid metal in or on cooking or food-handling equipment is not allowed.
In Germany, controls using liquid metal are allowed only with a special marking on the control. Documentation (D) shall
contain a clear warning of the actual danger that may occur. The following symbol shall be used for marking the control:
!
In Canada, the use of mercury is not allowed.
When no minimum is declared, the test value is 15 mA.
Consideration should be given to the provision of information by the equipment manufacturer relating to the minimum
time that the appliance has to be disconnected from the supply to allow a voltage maintained thermal cut-out to reset.
Determined by the control manufacturer based on the opening temperature of the thermal-cut-out.
Determined by the control manufacturer referring to the actual maximum rate of rise probable in the projected end-use
equipment.
8 Protection against electric shock
This clause of Part 1 is applicable.
9 Provision for protective earthing
This clause of Part 1 is applicable.
10 Terminals and terminations
This clause of Part 1 is applicable.
11 Constructional requirements
This clause of Part 1 is applicable except as follows:
11.1 Materials
Additional subclauses:
11.1.101 Parts containing liquid metal
For controls declared under Table 1, requirement 106, parts that contain mercury (Hg), and
parts of any control that contain sodium (Na), potassium (K), or both, shall be constructed
of metal that has a tensile yield strength at least four times the circumferential (hoop) or other
stress on the parts at a temperature 1,2 times the maximum temperature of the sensing
element (T ).
e
Compliance is checked by inspection of the manufacturer's declaration and by the test
of 18.102.
11.1.102 Material for non-bimetallic SODs
Insulating material used in non-bimetallic SODs as defined in this standard shall comply with
the requirements of IEC 60216-1:2013 and be suitable for the application.
Actuation and operation
11.3
11.3.9 Pull-cord actuated control
Addition:
NOTE 101 Note 2 is not applicable to controls classified as type 1.X or 2.X or type 1.Z or 2.Z.
11.4 Actions
11.4.3 Type 2 action
Additional subclauses:
11.4.3.101 Capacitors shall not be connected across the contacts of a thermal cut-out.
In Canada and the USA, a capacitor may not be connected across the contacts of a control with a Type 2 action.
11.4.3.102 Constructions requiring a soldering operation to reset thermal cut-outs are not
permitted.
11.4.13 Replacement:
11.4.13 Type 1.K or 2.K action
Additional subclauses:
11.4.13.101 A type 2.K action shall be so designed that in the event of a break in the sensing
element, or in any other part between the sensing element and the switch head, the declared
disconnection or interruption is provided before the sum of the declared operating value and
drift is exceeded.
Compliance is checked by breaking the sensing element. The breaking may be achieved by
partly pre-cutting or filing through.
The temperature sensing control is heated to within 10 K of the operating temperature and the
temperature then increased at a rate not to exceed 1 K/min. The contacts shall open before the
sum of the declared operating value plus drift is exceeded.
11.4.13.102 Type 2.K action may also be achieved by compliance with a), b) or c).
a) Two sensing elements operating independently from each other and actuating one switch
head.
b) Bimetallic sensing elements with
1) exposed elements attached with at least double spot welding of the bimetal at both of its
ends, or
2) elements so located or installed in a control of such construction that the bimetal is not
likely to be physically damaged during installation and use.
c) If the loss of the fluid fill causes the contacts of the control to remain closed or leakage
causes upward shift beyond the declared maximum operating temperature, the bulb and
capillary of a temperature sensing control which is actuated by a change in the pressure
of a fluid confined in the bulb and capillary shall conform to the following.
There shall be no damage to the bulb or capillary to the extent which will permit escape of
any of the fill when an impact tool, as illustrated in Figure 101, is dropped once from a
height of 0,60 m so that the tapered end of the tool strikes the bulb or capillary in a
perpendicular position. For this test, the capillary or the bulb shall be on a concrete surface.
– 16 – IEC 60730-2-9:2015 RLV © IEC 2015
If the capillary is provided with a separate shroud or sleeve, it is to be left in place during
the test described above.
Dimensions in millimetres
60°
R3,2
L
IEC
Material: Steel, CRS, Break all corners
L to be sized to obtain total mass of 0,454 kg
Figure 11.4.13.102 101 – Impact tool
Additional subclauses:
11.4.101 Type 2.N action
A type 2.N action shall be so designed that in the event of a leak in the sensing element, or in
any other part between the sensing element and the switch head, the declared disconnection
or interruption is provided before the sum of the declared operating value and drift is
exceeded.
Compliance is checked by the following test:
The operating value of a type 2.N control is measured under the conditions of Clause 15
of Part 1. If the control has means for setting, it is set to the highest value.
After this measurement, a hole is artificially produced in the sensing element and the
measurement of the operating value is repeated.
No positive drift is allowed above the declared value.
The test can be replaced by theoretical computations of the physical mode of operation.
A separate shroud or sleeve may be employed for protection of the bulb and capillary to
achieve conformance with Clause 18.
NOTE 1 The test can be replaced by theoretical computations of the physical mode of operation.
NOTE 2 In Canada and the USA, a type 2.N action is checked by item c) of 11.4.13.102.
11.4.102 Type 2.P action
A type 2.P action shall be so designed that it operates in its intended manner after a thermal
cycling test.
Compliance is checked by the test of 17.101.
25,4 25,4
11.4.103 Bimetallic single-operation device
A bimetallic single-operation device shall be so designed that it does not reset above the
reset value declared in Table 1, requirement 103.
Compliance is checked by the test of 17.15.
11.4.104 Type 1.X or 2.X
A type 1.X or 2.X action shall be so designed that a turn action can only be accomplished after
the completion of a push-action or a pull-action. Only rotation shall be required to return the
actuating member of the control to the OFF position or rest position.
Compliance is checked by the tests of 18.101.
11.4.105 Type 1.Z or 2.Z
A type 1.Z or 2.Z action shall be so designed that a turn action can only be accomplished after
the completion of a push-action or a pull-action.
Compliance is checked by the tests of 18.101.
11.4.106 Voltage maintained thermal cut-out
A voltage maintained thermal cut-out shall be so designed that it does not reset above the
reset value declared in Table1, requirement 111.
11.4.107 Type 1.AM or 2.AM
A type 1.AM or 2.AM action shall be so designed that it operates in its intended manner after
the declared agricultural environmental exposures.
Compliance is checked by the tests of Annex DD.
11.6 Mounting of controls
11.6.3 Mounting of independently mounted controls
Additional subclause:
11.6.3.101 For agricultural thermostats declared in Table 1, requirement 117, the mounting
method shall be such that the integrity of the protection by the enclosure is not compromised.
Additional subclause:
11.101 Time factor
If a time factor is declared, this shall be checked by one of the applicable determining
methods as indicated in Annex BB. The determined value shall not exceed the rated values.
See Table BB.1.
NOTE In Germany, for temperature sensing controls intended to control boiler water or flue gas temperature in
heat generating systems, the maximum values of time factor given in Table BB.1 shall not be exceeded.
12 Moisture and dust resistance
This clause of Part 1 is applicable except as follows:
– 18 – IEC 60730-2-9:2015 RLV © IEC 2015
Additional subclauses:
12.101 Refrigeration controls
Controls which have the switch head and sensing element mounted in the evaporator of
refrigeration or similar equipment, producing conditions of over temperature and of freezing
and melting, shall maintain insulation integrity.
12.101.1 Compliance is checked by the following tests.
12.101.2 Controls which use a potting compound are given a softening test. Two samples
are heated in a heating chamber at 15 K above the maximum declared operating temperature
for 16 h with the potting surface in the most unfavourable position. The potting material shall
not unduly soften or distort, crack or deteriorate.
12.101.3 The two samples used for the softening tests and one untested sample (three total)
are placed in water maintained at (90 ± 5) °C between T (maximum declared switch head
max
ambient temperature) and either (T +5) °C or 1,05 times T , whichever is greater for 2 h.
max max
The three samples are then immediately transferred to water at a temperature of below 5 °C for
2 h and then frozen in a small, flexible container at –35 °C a temperature between T
min
(minimum declared switch head ambient temperature) and (T –5) °C for 2 h. Ten heating-
min
freezing cycles are required.
NOTE In Canada and the USA, if the contact mechanism of defrost controls has the creepage distances and
clearances required for refrigeration controllers, one cycle only of heating and freezing is required, otherwise
ten cycles are required.
12.101.4 Two consecutive heating-freezing cycles are performed in one working day, and
then 10 cycles are completed in five consecutive days, with The tested samples shall be left in
water at room temperature for four overnight periods after each completed heating-freezing
cycle.
12.101.5 After the last freezing test, the samples are thawed to approximately room
temperature in water and the insulation resistance is measured from current-carrying parts to
grounded parts and to the surface of potting and/or insulating material; the direct current
voltmeter method is used. Insulation resistance shall be at least 50 000 Ω.
12.101.6 While the samples are still moist, a voltage equal to (2 × V ) + 1 000 V is applied at
R
rated frequency for 1 min between current-carrying parts and grounded parts and the surface
of the potting and/or insulating material. No flashover or breakdown of insulation shall occur
during the test.
13 Electric strength and insulation resistance
This clause of Part 1 is applicable except as follows:
13.2 Electric strength
Addition:
Additional note:
NOTE 101 In Canada and the USA, an independently mounted room thermostat for operation over 50 V,
intended for direct control of electric space-heating equipment, shall withstand for 1 min without breakdown,
the application of alternating potential of 900 V between the line and load terminals. A piece of insulating material
may be placed between the thermostat contacts during the test. There shall be no breakdown either through or
across the insulating material supporting the contact and terminal assemblies. This control shall be the control
that is designated as "SAMPLE 1" under the tests for compliance in 17.16.102.1 of this standard.
14 Heating
This clause of Part 1 is applicable except as follows:
14.4.3.1 The second paragraph is under consideration.
Addition:
For a voltage maintained thermal cut-out, the heating test of 14.4.3.1 is completed, after
which the temperature of the sensing element is raised until the contacts open. At this time,
the amb
...
IEC 60730-2-9 ®
Edition 4.0 2015-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
Dispositifs de commande électrique automatiques –
Partie 2-9: Exigences particulières pour les dispositifs de commande
thermosensibles
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.
IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées
antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60730-2-9 ®
Edition 4.0 2015-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
Dispositifs de commande électrique automatiques –
Partie 2-9: Exigences particulières pour les dispositifs de commande
thermosensibles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.120 ISBN 978-2-8322-7411-8
– 2 – IEC 60730-2-9:2015 © IEC 2015
CONTENTS
FOREWORD . 4
1 Scope and normative references . 7
2 Terms and definitions . 8
3 General requirements . 10
4 General notes on tests . 10
5 Rating . 11
6 Classification . 11
7 Information . 12
8 Protection against electric shock . 14
9 Provision for protective earthing . 14
10 Terminals and terminations . 14
11 Constructional requirements . 14
12 Moisture and dust resistance . 17
13 Electric strength and insulation resistance . 18
14 Heating . 18
15 Manufacturing deviation and drift . 19
16 Environmental stress . 20
17 Endurance . 20
18 Mechanical strength . 26
19 Threaded parts and connections . 28
20 Creepage distances, clearances and distances through solid insulation . 28
21 Resistance to heat, fire and tracking . 28
22 Resistance to corrosion . 28
23 Electromagnetic compatibility (EMC) requirements – Emission . 28
24 Components . 29
25 Normal operation . 29
26 Electromagnetic compatibility (EMC) requirements – Immunity . 29
27 Abnormal operation . 29
28 Guidance on the use of electronic disconnection . 29
Annexes . 30
Annex G (normative) Heat and fire resistance tests . 30
Annex H (normative) Requirements for electronic controls . 31
Annex J (normative) Requirements for thermistor elements and controls using
thermistors . 38
a, b
Annex AA (informative) Maximum manufacturing deviation and drift . 39
Annex BB (informative) Time factor . 40
Annex CC (informative) Number of cycles . 43
Annex DD (normative) Controls for use in agricultural confinement buildings . 44
Annex EE (informative) Guide to the application of temperature sensing controls
within the scope of IEC 60730-2-9 . 47
Bibliography . 63
Figure 101 – Impact tool . 16
Figure 102 – Aluminium cylinder for temperature change method . 26
Figure BB.1 – Determination of time factor in the case of a sudden temperature change . 41
Figure BB.2 – Determination of time factor in the case of a linear rise of test-bath
temperature . 42
Figure EE.1 – Thermostat . 55
Figure EE.2 – Self-resetting temperature limiter . 56
Figure EE.3 – Non-self-resetting temperature limiter . 57
Figure EE.4 – Self-resetting thermal cut-out. 58
Figure EE.5 – Manual reset thermal cut-out . 58
Figure EE.6 – Single operation device . 60
Figure EE.7 – Three-stage control system . 61
Table 1 – Required information and methods of providing information . 13
Table H.101 – Compliance criteria . 33
Table BB.1 – Method to determine and verify time factor values (see 11.101) . 42
Table EE.1 – Typical examples of the classification of temperature sensing controls in
accordance with IEC 60730-2-9 . 62
– 4 – IEC 60730-2-9:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60730-2-9 has been prepared by technical committee TC 72:
Automatic electrical controls.
This bilingual version (2019-10) corresponds to the monolingual English version, published
in 2015-05.
The text of this standard is based on the following documents:
FDIS Report on voting
72/990/FDIS 72/998/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
This fourth edition cancels and replaces the third edition published in 2008, and its
Amendment 1:2011. This edition constitutes a technical revision. This edition includes
alignment with the text of 60730-1 fifth edition and the following significant technical changes
with respect to the previous edition:
a) modification of heating-freezing tests in Clause 12;
b) alignment of the EMC requirements in H.26 to those in other part 2 standards;
c) addition of requirements in Clause H.27 to cover class B and C control functions of
temperature sensing controls;
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-9 is intended to be used in conjunction with IEC 60730-1. It was established on
the basis of the fifth edition (2013) of that publication. Consideration may be given to future
editions of, or amendments to, IEC 60730-1.
This Part 2-9 supplements or modifies the corresponding clauses in IEC 60730-1 so as to
convert that publication into the IEC standard: Particular requirements for temperature
sensing controls.
Where this Part 2-9 states "addition", "modification", or "replacement", the relevant
requirement, test specification or explanatory matter in part 1 should be adapted accordingly.
Where no change is necessary, this part 2 indicates that the relevant clause or subclause
applies.
In the development of a fully international standard, it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The “in some countries” notes regarding differing national practices are contained in the
following subclauses:
4.1.101 17.8.4.101 Annex AA
7.2, Table 1 17.16.101 Clause CC.2
11.4.101 17.16.102 DD.9.2
11.101 17.16.105 EE.3.6
12.101.3 18.102.3
13.2 23.101
In this publication:
1) The following print types are used:
– Requirements proper: in roman type;
– Test specifications: in italic type;
– Notes; in small roman type;
– Words defined in Clause 2: bold.
2) Subclauses, notes, tables and figures which are additional to those in part 1 are numbered
starting from 101, additional annexes are lettered AA, BB, etc.
A list of all parts of the IEC 60730 series, published under the title Automatic electrical
controls can be found on the IEC website.
– 6 – IEC 60730-2-9:2015 © IEC 2015
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
1 Scope and normative references
This clause of Part 1 is applicable except as follows:
1.1 Scope
Replacement:
This part of IEC 60730 applies to automatic electrical temperature sensing controls for use
in, on or in association with equipment, including electrical controls for heating, air-
conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel,
solar thermal energy, etc., or a combination thereof.
NOTE Throughout this standard, the word "equipment" includes "appliance" and "control system".
This standard is applicable to automatic electrical temperature sensing controls forming part
of a building automation control system within the scope of ISO 16484.
This standard also applies to automatic electrical temperature sensing controls for
equipment that may be used by the public, such as equipment intended to be used in shops,
offices, hospitals, farms and commercial and industrial applications.
This standard does not apply to automatic electrical temperature sensing controls intended
exclusively for industrial process applications, unless explicitly mentioned in the relevant
equipment standard.
1.1.1
Replacement:
This standard applies to the inherent safety, to the operating values, operating times, and
operating sequences where such are associated with equipment safety, and to the testing of
automatic electrical temperature sensing control devices used in, or in association with,
equipment.
NOTE Examples of such controls include boiler thermostats, fan controls, temperature limiters and thermal
cut-outs.
This standard is also applicable to the functional safety of low complexity safety-related
temperature sensing controls and systems.
1.1.2
Addition:
This standard also applies to the electrical safety of temperature sensing controls with non-
electrical outputs such as refrigerant flow and gas controls.
– 8 – IEC 60730-2-9:2015 © IEC 2015
1.1.3 Not applicable.
1.1.4
Replacement:
This standard applies to manual controls when such are electrically and/or mechanically
integral with automatic temperature sensing controls.
NOTE Requirements for manual switches not forming part of an automatic control are contained in IEC 61058-1.
1.1.5
Replacement:
This standard applies to a.c. or d.c. powered temperature sensing controls with a rated
voltage not exceeding 690 V a.c. or 600 V d.c.
1.1.6
Replacement:
This standard does not take into account the response value of an automatic action of a
temperature sensing control, if such a response value is dependent upon the method of
mounting it in the equipment. Where a response value is of significant purpose for the
protection of the user, or surroundings, the value defined in the appropriate equipment
standard or as determined by the manufacturer shall apply.
1.1.7
Replacement:
This standard applies also to temperature sensing controls incorporating electronic
devices, requirements for which are contained in Annex H and to temperature sensing
controls using NTC thermistors or PTC thermistors, requirements for which are contained
in Annex J.
Additional subclause:
1.1.101 This standard applies to single operation devices as defined in this standard.
1.1 Normative references
Addition:
IEC 60216-1:2013, Electrical insulating materials – Thermal endurance properties – Part 1:
Ageing procedures and evaluation of test results
IEC 60691, Thermal links – Requirements and application guide
IEC 60730-2-4, Automatic electrical controls for household and similar use – Part 2-4:
Particular requirements for thermal motor protectors for motor-compressors of hermetic and
semi-hermetic type
2 Terms and definitions
This clause of Part 1 is applicable except as follows:
2.2 Definitions of types of control according to purpose
2.2.19
operating control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermostat is an operating control.
2.2.20
protective control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermal cut-out is a protective control.
Additional definitions:
2.2.101
single-operation device
SOD
control having a temperature sensing element which is intended to operate only once and
then requires complete replacement
2.2.101.1
bimetallic single-operation device
single operation device (SOD) having a bimetallic temperature sensing element
Note 1 to entry: A bimetallic single operation device (SOD) does not reset above a declared temperature (see
11.4.103).
Note 2 to entry: Requirements for thermal links (which are not allowed to reset) are contained in IEC 60691.
2.2.101.2
non-bimetallic single-operation device
single operation device (SOD) having a temperature sensing element which is part of a
combination action control, the operation of which cannot be separated from other functions
of the control and having a non-bimetallic thermal element that operates only once and then
requires complete or partial replacement
Note 1 to entry: When such parts can be tested separately, they are considered to be thermal links within the
scope of IEC 60691.
Note 2 to entry: The ageing period and thermal response of the device is dependent on the intended use of the
device. As a result, the nature of the testing applicable to the device is representative of the application conditions
for which the protective control is intended (see 7.2).
Note 3 to entry: Non-bimetallic SODs provide the equivalent of micro-disconnection.
2.2.101.2.1
rated functioning temperature
T
f
temperature of the sensing element of a non-bimetallic SOD which causes it to change the
state of conductivity of the control when measured under specified conditions as declared by
the manufacturer
2.2.102
room thermostat
independently mounted or incorporated thermostat intended to control the temperature of
habitable space
– 10 – IEC 60730-2-9:2015 © IEC 2015
2.2.103
fan control
automatic temperature sensing control intended to control the operation of a fan or blower
2.2.104
boiler thermostat
thermostat intended to control boiler/liquid temperature
2.2.105
modulating thermostat
thermostat which controls the temperature between two limits by continuously controlling the
input to the load
2.2.106
voltage maintained thermal cut-out
thermal cut-out which is maintained in its operated condition by the voltage which appears
across it in that condition
2.2.107
agricultural thermostat
thermostat intended for use in agricultural confinement buildings
2.3 Definitions relating to the function of controls
2.3.14 Additional definition:
2.3.14.101
time factor
transient response of temperature sensing controls by defined change of the activating
quantity
2.5 Definitions of types of control according to construction
Additional definitions:
2.5.101
push-and-turn actuation
two-step actuation accomplished by first pushing, then rotating the actuating member of the
control
2.5.102
pull-and-turn actuation
two-step actuation accomplished by first pulling, then rotating the actuating member of the
control
3 General requirements
This clause of Part 1 is applicable.
4 General notes on tests
4.1 Conditions of test
This clause of Part 1 is applicable except as follows:
4.1 Conditions of test
Additional subclauses:
4.1.101 For the purposes of the tests of this standard and unless otherwise indicated,
ambient temperature excursions beyond T during abnormal operation as a precursor to
max
the operation of a manual reset thermal cut-out or a bimetallic SOD are ignored.
NOTE In Canada and the USA, the preceding applies only to bimetallic SODs.
4.1.102 For manual reset thermal cut-outs and bimetallic SODs which have an operating
value above T , the temperature at the sensing element is raised, as necessary, to
max
achieve any cycling required during the tests.
4.2 amples required
4.2.1 Addition:
Six samples of bimetallic SODs are used for the test of Clause 15 and a further six for the
test of Clause 17.
5 Rating
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows:
6.4 According to features of automatic action
6.4.3 Additional subclauses:
6.4.3.101 – for sensing actions, no increase in the operating value as a result of any
leakage from the sensing element, or from parts connecting the sensing element to the
switch head (type 2.N);
6.4.3.102 – an action which operates after a declared thermal cycling test as specified
in 17.101 (type 2.P);
NOTE In general, thermal cut-outs for specific applications, such as pressurized water heating systems, may be
classified as having Type 2.P action.
6.4.3.103 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation and in which only rotation is required to return the actuating member to the
OFF position or rest position (type 1.X or 2.X);
6.4.3.104 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation (type 1.Z or 2.Z);
6.4.3.105 – an action which cannot be reset under electrically loaded conditions (type 1.AK
or 2.AK);
6.4.3.106 – an action which operates after declared agricultural environmental exposures
(type 1.AM or 2.AM).
6.7 According to ambient temperature limits of the switch head
Additional subclauses:
– 12 – IEC 60730-2-9:2015 © IEC 2015
6.7.101 Controls for use in or on cooking appliances.
6.7.102 Controls for use in or on ovens of the self-cleaning type.
6.7.103 Controls for use in or on food-handling appliances.
6.7.104 The non-bimetallic SODs are limited for use in appliances for heating or employing
liquids or steam. It is not suitable for instantaneous water heaters and storage water heaters.
6.8.3 Modification:
Replace the first paragraph by:
For an in-line cord control, a free standing control, an independently mounted control or a
control integrated or incorporated in an assembly utilizing a non-electrical energy source:
6.15 According to construction
Additional subclause:
6.15.101 – controls having parts containing liquid metal.
7 Information
This clause of Part 1 is applicable except as follows:
7.2 Methods of providing information
Table 1 – Required information and methods of providing information
Addition:
Clause or
Information Method
subclause
101 Maximum sensing element temperature (other than relevant to 6.7 X
requirement 105) 6.15
14.101
102 Time factor with or without sheath 2.3.14.101 X
11.101
BB.1.2
103 SOD reset temperature (either –35 °C or 0 °C) 2.2.101 X
11.4.103
17.15.2.3
104 Number of cycles for bimetallic SOD with 0 °C reset 17.15.1.3.1 X
105 Maximum sensing element temperature for the test of 17.16.107 (T ) 6.7.102 D
e
17.16.107
106 Controls having parts containing liquid metal 6.15.101 D
11.1.101
18.102
107 Tensile yield strength 11.1.101 X
108 Minimum current for the purpose of the test of 23.101 23.101 D
109 T is the maximum ambient temperature in which the control may remain continuously in 14.4.3.1 D
max.1
the operated condition so that Table 13 temperatures are not exceeded
110 Time period t is the maximum time during which the ambient temperature can be higher than 14.4.3.1 D
T after the control has operated
max.1
111 Temperature limit above which automatic reset of a manual reset thermal cut-out or a voltage 2.2.106 X
maintained thermal cut-out shall not occur (not higher than –20 °C) 11.4.106
17.16.104.1
17.16.108
112 For type 2.P controls, the method of test 17.101 X
113 The click rate N or switching operations per minute for the purposes of testing to CISPR 14-1 23 X
114 Rated functioning temperature (T ) 2.2.101.2.1 C
f
17.15.2
115 Ageing temperature for non-bimetallic SOD 17.15.2.2 D
17.15.2.3
116 Rate of rise of temperature for testing non-bimetallic SOD 17.15.2.2 D
17.15.2.3
117 Agricultural thermostat 2.2.107 D
6.4.3.106
11.4.107
11.6.3.101
Annex DD
– 14 – IEC 60730-2-9:2015 © IEC 2015
Additional footnotes:
This declaration applies only to temperature sensing controls containing liquid metal. For temperature sensing controls
used in or on self-cleaning ovens, this declaration is the temperature for the cooking operation.
In China, the use of liquid metal in or on cooking or food-handling equipment is not allowed.
In Germany, controls using liquid metal are allowed only with a special marking on the control. Documentation (D) shall
contain a clear warning of the actual danger that may occur. The following symbol shall be used for marking the control:
!
In Canada, the use of mercury is not allowed.
When no minimum is declared, the test value is 15 mA.
Consideration should be given to the provision of information by the equipment manufacturer relating to the minimum time
that the appliance has to be disconnected from the supply to allow a voltage maintained thermal cut-out to reset.
Determined by the control manufacturer based on the opening temperature of the thermal-cut-out.
Determined by the control manufacturer referring to the actual maximum rate of rise probable in the projected end-use
equipment.
8 Protection against electric shock
This clause of Part 1 is applicable.
9 Provision for protective earthing
This clause of Part 1 is applicable.
10 Terminals and terminations
This clause of Part 1 is applicable.
11 Constructional requirements
This clause of Part 1 is applicable except as follows:
11.1 Materials
Additional subclauses:
11.1.101 Parts containing liquid metal
For controls declared under Table 1, requirement 106, parts that contain mercury (Hg), and
parts of any control that contain sodium (Na), potassium (K), or both, shall be constructed
of metal that has a tensile yield strength at least four times the circumferential (hoop) or other
stress on the parts at a temperature 1,2 times the maximum temperature of the sensing
element (T ).
e
Compliance is checked by inspection of the manufacturer's declaration and by the test
of 18.102.
11.1.102 Material for non-bimetallic SODs
Insulating material used in non-bimetallic SODs as defined in this standard shall comply with
the requirements of IEC 60216-1:2013 and be suitable for the application.
11.3 Actuation and operation
11.3.9 Pull-cord actuated control
Addition:
NOTE 101 Note 2 is not applicable to controls classified as type 1.X or 2.X or type 1.Z or 2.Z.
11.4 Actions
11.4.3 Type 2 action
Additional subclauses:
11.4.3.101 Capacitors shall not be connected across the contacts of a thermal cut-out.
11.4.3.102 Constructions requiring a soldering operation to reset thermal cut-outs are not
permitted.
11.4.13 Type 1.K or 2.K action
Additional subclauses:
11.4.13.101 A type 2.K action shall be so designed that in the event of a break in the
sensing element, or in any other part between the sensing element and the switch head,
the declared disconnection or interruption is provided before the sum of the declared
operating value and drift is exceeded.
Compliance is checked by breaking the sensing element. The breaking may be achieved by
partly pre-cutting or filing through.
The temperature sensing control is heated to within 10 K of the operating temperature and
the temperature then increased at a rate not to exceed 1 K/min. The contacts shall open
before the sum of the declared operating value plus drift is exceeded.
11.4.13.102 Type 2.K action may also be achieved by compliance with a), b) or c).
a) Two sensing elements operating independently from each other and actuating one switch
head.
b) Bimetallic sensing elements with
1) exposed elements attached with at least double spot welding of the bimetal at both of
its ends, or
2) elements so located or installed in a control of such construction that the bimetal is
not likely to be physically damaged during installation and use.
c) If the loss of the fluid fill causes the contacts of the control to remain closed or leakage
causes upward shift beyond the declared maximum operating temperature, the bulb and
capillary of a temperature sensing control which is actuated by a change in the pressure
of a fluid confined in the bulb and capillary shall conform to the following.
There shall be no damage to the bulb or capillary to the extent which will permit escape of
any of the fill when an impact tool, as illustrated in Figure 101, is dropped once from a
height of 0,60 m so that the tapered end of the tool strikes the bulb or capillary in a
perpendicular position. For this test, the capillary or the bulb shall be on a concrete
surface.
If the capillary is provided with a separate shroud or sleeve, it is to be left in place during
the test described above.
– 16 – IEC 60730-2-9:2015 © IEC 2015
Dimensions in millimetres
60°
R3,2
L
IEC
Material: Steel, CRS, Break all corners
L to be sized to obtain total mass of 0,454 kg
Figure 101 – Impact tool
Additional subclauses:
11.4.101 Type 2.N action
A type 2.N action shall be so designed that in the event of a leak in the sensing element, or
in any other part between the sensing element and the switch head, the declared
disconnection or interruption is provided before the sum of the declared operating value and
drift is exceeded.
Compliance is checked by the following test:
The operating value of a type 2.N control is measured under the conditions of Clause 15
of Part 1. If the control has means for setting, it is set to the highest value.
After this measurement, a hole is artificially produced in the sensing element and the
measurement of the operating value is repeated.
No positive drift is allowed above the declared value.
A separate shroud or sleeve may be employed for protection of the bulb and capillary to
achieve conformance with Clause 18.
NOTE 1 The test can be replaced by theoretical computations of the physical mode of operation.
NOTE 2 In Canada and the USA, a type 2.N action is checked by item c) of 11.4.13.102.
11.4.102 Type 2.P action
A type 2.P action shall be so designed that it operates in its intended manner after a thermal
cycling test.
Compliance is checked by the test of 17.101.
11.4.103 Bimetallic single-operation device
A bimetallic single-operation device shall be so designed that it does not reset above the
reset value declared in Table 1, requirement 103.
25,4 25,4
Compliance is checked by the test of 17.15.
11.4.104 Type 1.X or 2.X
A type 1.X or 2.X action shall be so designed that a turn action can only be accomplished
after the completion of a push-action or a pull-action. Only rotation shall be required to return
the actuating member of the control to the OFF position or rest position.
Compliance is checked by the tests of 18.101.
11.4.105 Type 1.Z or 2.Z
A type 1.Z or 2.Z action shall be so designed that a turn action can only be accomplished
after the completion of a push-action or a pull-action.
Compliance is checked by the tests of 18.101.
11.4.106 Voltage maintained thermal cut-out
A voltage maintained thermal cut-out shall be so designed that it does not reset above the
reset value declared in Table1, requirement 111.
11.4.107 Type 1.AM or 2.AM
A type 1.AM or 2.AM action shall be so designed that it operates in its intended manner after
the declared agricultural environmental exposures.
Compliance is checked by the tests of Annex DD.
11.6 Mounting of controls
11.6.3 Mounting of independently mounted controls
Additional subclause:
11.6.3.101 For agricultural thermostats declared in Table 1, requirement 117, the mounting
method shall be such that the integrity of the protection by the enclosure is not compromised.
Additional subclause:
11.101 Time factor
If a time factor is declared, this shall be checked by one of the applicable determining
methods as indicated in Annex BB. The determined value shall not exceed the rated values.
See Table BB.1.
NOTE In Germany, for temperature sensing controls intended to control boiler water or flue gas temperature in
heat generating systems, the maximum values of time factor given in Table BB.1 shall not be exceeded.
12 Moisture and dust resistance
This clause of Part 1 is applicable except as follows:
Additional subclauses:
– 18 – IEC 60730-2-9:2015 © IEC 2015
12.101 Refrigeration controls
Controls which have the switch head and sensing element mounted in the evaporator of
refrigeration or similar equipment, producing conditions of over temperature and of freezing
and melting, shall maintain insulation integrity.
12.101.1 Compliance is checked by the following tests.
12.101.2 Controls which use a potting compound are given a softening test. Two samples
are heated in a heating chamber at 15 K above the maximum declared operating temperature
for 16 h with the potting surface in the most unfavourable position. The potting material shall
not unduly soften or distort, crack or deteriorate.
12.101.3 The two samples used for the softening tests and one untested sample (three total)
are placed in water maintained between T (maximum declared switch head ambient
max
temperature) and either (T +5) °C or 1,05 times T , whichever is greater for 2 h. The
max max
three samples are then immediately transferred to water at a temperature of below 5 °C for
2 h and then frozen in a small, flexible container at a temperature between T (minimum
min
declared switch head ambient temperature) and (T –5) °C for 2 h. Ten heating-freezing
min
cycles are required.
NOTE In Canada and the USA, if the contact mechanism of defrost controls has the creepage distances and
clearances required for refrigeration controllers, one cycle only of heating and freezing is required, otherwise
ten cycles are required.
12.101.4 The tested samples shall be left in water at room temperature overnight after each
completed heating-freezing cycle.
12.101.5 After the last freezing test, the samples are thawed to approximately room
temperature in water and the insulation resistance is measured from current-carrying parts to
grounded parts and to the surface of potting and/or insulating material; the direct current
voltmeter method is used. Insulation resistance shall be at least 50 000 Ω.
12.101.6 While the samples are still moist, a voltage equal to (2 × V ) + 1 000 V is applied
R
at rated frequency for 1 min between current-carrying parts and grounded parts and the
surface of the potting and/or insulating material. No flashover or breakdown of insulation shall
occur during the test.
13 Electric strength and insulation resistance
This clause of Part 1 is applicable except as follows:
13.2 Electric strength
Additional note:
NOTE 101 In the USA, an independently mounted room thermostat for operation over 50 V, intended for direct
control of electric space-heating equipment, shall withstand for 1 min without breakdown the application of
alternating potential of 900 V between the line and load terminals. A piece of insulating material may be placed
between the thermostat contacts during the test. There shall be no breakdown either through or across the
insulating material supporting the contact and terminal assemblies. This control shall be the control that is
designated as "SAMPLE 1" under the tests for compliance in 17.16.102.1 of this standard.
14 Heating
This clause of Part 1 is applicable except as follows:
-----
...
IEC 60730-2-9 ®
Edition 4.1 2018-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
Commandes électriques automatiques –
Partie 2-9: Exigences particulières pour les commandes de détection
de température
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and definitions clause of
IEC publications issued between 2002 and 2015. Some
IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
If you wish to give us your feedback on this publication or TC 37, 77, 86 and CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.
IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues entre 2002 et 2015. Plus certaines
entrées antérieures extraites des publications des CE 37, 77,
Service Clients - webstore.iec.ch/csc 86 et CISPR de l'IEC.
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60730-2-9 ®
Edition 4.1 2018-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
Commandes électriques automatiques –
Partie 2-9: Exigences particulières pour les commandes de détection
de température
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.120 ISBN 978-2-8322-8584-8
IEC 60730-2-9 ®
Edition 4.1 2018-01
REDLINE VERSION
VERSION REDLINE
colour
inside
Automatic electrical controls –
Part 2-9: Particular requirements for temperature sensing controls
Commandes électriques automatiques –
Partie 2-9: Exigences particulières pour les commandes de détection
de température
– 2 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
CONTENTS
FOREWORD . 4
1 Scope and normative references . 7
2 Terms and definitions . 8
3 General requirements . 10
4 General notes on tests . 10
5 Rating. 11
6 Classification . 11
7 Information . 12
8 Protection against electric shock . 14
9 Provision for protective earthing . 14
10 Terminals and terminations . 14
11 Constructional requirements . 14
12 Moisture and dust resistance . 17
13 Electric strength and insulation resistance . 18
14 Heating . 18
15 Manufacturing deviation and drift . 19
16 Environmental stress . 20
17 Endurance . 20
18 Mechanical strength . 26
19 Threaded parts and connections . 28
20 Creepage distances, clearances and distances through solid insulation . 28
21 Resistance to heat, fire and tracking . 28
22 Resistance to corrosion . 28
23 Electromagnetic compatibility (EMC) requirements – Emission . 28
24 Components . 29
25 Normal operation . 29
26 Electromagnetic compatibility (EMC) requirements – Immunity . 29
27 Abnormal operation . 29
28Guidance on the use of electronic disconnection . 29
Annexes . 30
Annex G (normative) Heat and fire resistance tests . 30
Annex H (normative) Requirements for electronic controls . 31
Annex J (normative) Requirements for thermistor elements and controls using
thermistors . 38
a, b
Annex AA (informative) Maximum manufacturing deviation and drift . 39
Annex BB (informative) Time factor . 40
Annex CC (informative) Number of cycles . 43
Annex DD (normative) Controls for use in agricultural confinement buildings . 44
Annex EE (informative) Guide to the application of temperature sensing controls
within the scope of IEC 60730-2-9 . 47
Bibliography . 73
© IEC 2018
Figure 101 – Impact tool . 16
Figure 102 – Aluminium cylinder for temperature change method . 26
Figure BB.1 – Determination of time factor in the case of a sudden temperature change . 41
Figure BB.2 – Determination of time factor in the case of a linear rise of test-bath
temperature . 42
Figure EE.1 – Thermostat . 58
Figure EE.2 – Self-resetting temperature limiter . 59
Figure EE.3 – Non-self-resetting temperature limiter . 59
Figure EE.4 – Self-resetting thermal cut-out. 61
Figure EE.5 – Manual reset thermal cut-out . 61
Figure EE.6 – Single operation device . 63
Figure EE.7 – Three-stage control system . 64
Figure EE.8 – Schematic diagram showing usage of various controls approved to
IEC 60730-2-9 . 68
Table 1 – Required information and methods of providing information . 13
Table H.101 – Compliance criteria . 33
Table BB.1 – Method to determine and verify time factor values (see 11.101) . 42
Table EE.1 – Typical examples of the classification of temperature sensing controls in
accordance with IEC 60730-2-9 . 65
Table EE.2 – Examples of controls expected to operate during Clauses 11 and 19 of
IEC 60335 (all parts) . 69
Table EE.3 – Guidance on the common usage of types of control . 70
– 4 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60730-2-9 edition 4.1 contains the fourth edition (2015-05) [documents 72/990/FDIS
and 72/998/RVD] and its amendment 1 (2018-01) [documents 72/1112A/FDIS and
72/1118/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
© IEC 2018
International Standard IEC 60730-2-9 has been prepared by technical committee TC 72:
Automatic electrical controls.
This fourth edition constitutes a technical revision.
This edition includes alignment with the text of 60730-1 fifth edition and the following
significant technical changes with respect to the previous edition:
a) modification of heating-freezing tests in Clause 12;
b) alignment of the EMC requirements in H.26 to those in other part 2 standards;
c) addition of requirements in Clause H.27 to cover class B and C control functions of
temperature sensing controls;
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-9 is intended to be used in conjunction with IEC 60730-1. It was established on
the basis of the fifth edition (2013) of that publication. Consideration may be given to future
editions of, or amendments to, IEC 60730-1.
This Part 2-9 supplements or modifies the corresponding clauses in IEC 60730-1 so as to
convert that publication into the IEC standard: Particular requirements for temperature
sensing controls.
Where this Part 2-9 states "addition", "modification", or "replacement", the relevant
requirement, test specification or explanatory matter in part 1 should be adapted accordingly.
Where no change is necessary, this part 2 indicates that the relevant clause or subclause
applies.
In the development of a fully international standard, it has been necessary to take into
consideration the differing requirements resulting from practical experience in various parts of
the world and to recognize the variation in national electrical systems and wiring rules.
The “in some countries” notes regarding differing national practices are contained in the
following subclauses:
4.1.101 17.8.4.101 Annex AA
7.2, Table 1 17.16.101 Clause CC.2
11.4.101 17.16.102 DD.9.2
11.101 17.16.105 EE.3.6
12.101.3 18.102.3
13.2 23.101
In this publication:
1) The following print types are used:
– Requirements proper: in roman type;
– Test specifications: in italic type;
– Notes; in small roman type;
– Words defined in Clause 2: bold.
2) Subclauses, notes, tables and figures which are additional to those in part 1 are numbered
starting from 101, additional annexes are lettered AA, BB, etc.
– 6 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
A list of all parts of the IEC 60730 series, published under the title Automatic electrical
controls can be found on the IEC website.
The committee has decided that the contents of the base publication and its amendment will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
© IEC 2018
AUTOMATIC ELECTRICAL CONTROLS –
Part 2-9: Particular requirements for temperature sensing controls
1 Scope and normative references
This clause of Part 1 is applicable except as follows:
1.1 Scope
Replacement:
This part of IEC 60730 applies to automatic electrical temperature sensing controls for use
in, on or in association with equipment, including electrical controls for heating, air-
conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel,
solar thermal energy, etc., or a combination thereof.
NOTE Throughout this standard, the word "equipment" includes "appliance" and "control system".
This standard is applicable to automatic electrical temperature sensing controls forming part
of a building automation control system within the scope of ISO 16484.
This standard also applies to automatic electrical temperature sensing controls for
equipment that may be used by the public, such as equipment intended to be used in shops,
offices, hospitals, farms and commercial and industrial applications.
This standard does not apply to automatic electrical temperature sensing controls intended
exclusively for industrial process applications, unless explicitly mentioned in the relevant
equipment standard.
1.1.1
Replacement:
This standard applies to the inherent safety, to the operating values, operating times, and
operating sequences where such are associated with equipment safety, and to the testing of
automatic electrical temperature sensing control devices used in, or in association with,
equipment.
NOTE Examples of such controls include boiler thermostats, fan controls, temperature limiters and thermal
cut-outs.
This standard is also applicable to the functional safety of low complexity safety-related
temperature sensing controls and systems.
1.1.2
Addition:
This standard also applies to the electrical safety of temperature sensing controls with non-
electrical outputs such as refrigerant flow and gas controls.
– 8 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
1.1.3 Not applicable.
1.1.4
Replacement:
This standard applies to manual controls when such are electrically and/or mechanically
integral with automatic temperature sensing controls.
NOTE Requirements for manual switches not forming part of an automatic control are contained in IEC 61058-1.
1.1.5
Replacement:
This standard applies to a.c. or d.c. powered temperature sensing controls with a rated
voltage not exceeding 690 V a.c. or 600 V d.c.
1.1.6
Replacement:
This standard does not take into account the response value of an automatic action of a
temperature sensing control, if such a response value is dependent upon the method of
mounting it in the equipment. Where a response value is of significant purpose for the
protection of the user, or surroundings, the value defined in the appropriate equipment
standard or as determined by the manufacturer shall apply.
1.1.7
Replacement:
This standard applies also to temperature sensing controls incorporating electronic
devices, requirements for which are contained in Annex H and to temperature sensing
controls using NTC thermistors or PTC thermistors, requirements for which are contained
in Annex J.
Additional subclause:
1.1.101 This standard applies to single operation devices as defined in this standard.
1.1 Normative references
Addition:
IEC 60216-1:2013, Electrical insulating materials – Thermal endurance properties – Part 1:
Ageing procedures and evaluation of test results
IEC 60691, Thermal links – Requirements and application guide
IEC 60730-2-4, Automatic electrical controls for household and similar use – Part 2-4:
Particular requirements for thermal motor protectors for motor-compressors of hermetic and
semi-hermetic type
2 Terms and definitions
This clause of Part 1 is applicable except as follows:
© IEC 2018
2.2 Definitions of types of control according to purpose
2.2.19
operating control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermostat is an operating control.
2.2.20
protective control
Add, to the definition, the following note:
Note 1 to entry: In general, a thermal cut-out is a protective control.
Additional definitions:
2.2.101
single-operation device
SOD
control having a temperature sensing element which is intended to operate only once and
then requires complete replacement
2.2.101.1
bimetallic single-operation device
single operation device (SOD) having a bimetallic temperature sensing element
Note 1 to entry: A bimetallic single operation device (SOD) does not reset above a declared temperature (see
11.4.103).
Note 2 to entry: Requirements for thermal links (which are not allowed to reset) are contained in IEC 60691.
2.2.101.2
non-bimetallic single-operation device
single operation device (SOD) having a temperature sensing element which is part of a
combination action control, the operation of which cannot be separated from other functions
of the control and having a non-bimetallic thermal element that operates only once and then
requires complete or partial replacement
Note 1 to entry: When such parts can be tested separately, they are considered to be thermal links within the
scope of IEC 60691.
Note 2 to entry: The ageing period and thermal response of the device is dependent on the intended use of the
device. As a result, the nature of the testing applicable to the device is representative of the application conditions
for which the protective control is intended (see 7.2).
Note 3 to entry: Non-bimetallic SODs provide the equivalent of micro-disconnection.
2.2.101.2.1
rated functioning temperature
T
f
temperature of the sensing element of a non-bimetallic SOD which causes it to change the
state of conductivity of the control when measured under specified conditions as declared by
the manufacturer
2.2.102
room thermostat
independently mounted or incorporated thermostat intended to control the temperature of
habitable space
– 10 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
2.2.103
fan control
automatic temperature sensing control intended to control the operation of a fan or blower
2.2.104
boiler thermostat
thermostat intended to control boiler/liquid temperature
2.2.105
modulating thermostat
thermostat which controls the temperature between two limits by continuously controlling the
input to the load
2.2.106
voltage maintained thermal cut-out
thermal cut-out which is maintained in its operated condition by the voltage which appears
across it in that condition
2.2.107
agricultural thermostat
thermostat intended for use in agricultural confinement buildings
2.3 Definitions relating to the function of controls
2.3.14 Additional definition:
2.3.14.101
time factor
transient response of temperature sensing controls by defined change of the activating
quantity
2.5 Definitions of types of control according to construction
Additional definitions:
2.5.101
push-and-turn actuation
two-step actuation accomplished by first pushing, then rotating the actuating member of the
control
2.5.102
pull-and-turn actuation
two-step actuation accomplished by first pulling, then rotating the actuating member of the
control
3 General requirements
This clause of Part 1 is applicable.
4 General notes on tests
4.1 Conditions of test
This clause of Part 1 is applicable except as follows:
4.1 Conditions of test
© IEC 2018
Additional subclauses:
4.1.101 For the purposes of the tests of this standard and unless otherwise indicated,
ambient temperature excursions beyond T during abnormal operation as a precursor to
max
the operation of a manual reset thermal cut-out or a bimetallic SOD are ignored.
NOTE In Canada and the USA, the preceding applies only to bimetallic SODs.
4.1.102 For manual reset thermal cut-outs and bimetallic SODs which have an operating
value above T , the temperature at the sensing element is raised, as necessary, to
max
achieve any cycling required during the tests.
4.2 amples required
4.2.1 Addition:
Six samples of bimetallic SODs are used for the test of Clause 15 and a further six for the
test of Clause 17.
5 Rating
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows:
6.4 According to features of automatic action
6.4.3 Additional subclauses:
6.4.3.101 – for sensing actions, no increase in the operating value as a result of any
leakage from the sensing element, or from parts connecting the sensing element to the
switch head (type 2.N);
6.4.3.102 – an action which operates after a declared thermal cycling test as specified
in 17.101 (type 2.P);
NOTE In general, thermal cut-outs for specific applications, such as pressurized water heating systems, may be
classified as having Type 2.P action.
6.4.3.103 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation and in which only rotation is required to return the actuating member to the
OFF position or rest position (type 1.X or 2.X);
6.4.3.104 – an action which is initiated only after a push-and-turn actuation or pull-and-
turn actuation (type 1.Z or 2.Z);
6.4.3.105 – an action which cannot be reset under electrically loaded conditions (type 1.AK
or 2.AK);
6.4.3.106 – an action which operates after declared agricultural environmental exposures
(type 1.AM or 2.AM).
6.7 According to ambient temperature limits of the switch head
Additional subclauses:
– 12 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
6.7.101 Controls for use in or on cooking appliances.
6.7.102 Controls for use in or on ovens of the self-cleaning type.
6.7.103 Controls for use in or on food-handling appliances.
6.7.104 The non-bimetallic SODs are limited for use in appliances for heating or employing
liquids or steam. It is not suitable for instantaneous water heaters and storage water heaters.
6.8.3 Modification:
Replace the first paragraph by:
For an in-line cord control, a free standing control, an independently mounted control or a
control integrated or incorporated in an assembly utilizing a non-electrical energy source:
6.15 According to construction
Additional subclause:
6.15.101 – controls having parts containing liquid metal.
7 Information
This clause of Part 1 is applicable except as follows:
© IEC 2018
7.2 Methods of providing information
Table 1 – Required information and methods of providing information
Addition:
Clause or
Information Method
subclause
101 Maximum sensing element temperature (other than relevant to 6.7 X
requirement 105) 6.15
14.101
102 Time factor with or without sheath 2.3.14.101 X
11.101
BB.1.2
103 SOD reset temperature (either –35 °C or 0 °C) 2.2.101 X
11.4.103
17.15.2.3
104 Number of cycles for bimetallic SOD with 0 °C reset 17.15.1.3.1 X
105 Maximum sensing element temperature for the test of 17.16.107 (T ) 6.7.102 D
e
17.16.107
106 Controls having parts containing liquid metal 6.15.101 D
11.1.101
18.102
107 Tensile yield strength 11.1.101 X
108 Minimum current for the purpose of the test of 23.101 23.101 D
109 T is the maximum ambient temperature in which the control may remain 14.4.3.1 D
max.1
continuously in the operated condition so that Table 13 temperatures are not
exceeded
110 Time period t is the maximum time during which the ambient temperature can be 14.4.3.1 D
higher than T after the control has operated
max.1
111 Temperature limit above which automatic reset of a manual reset thermal cut-out 2.2.106 X
or a voltage maintained thermal cut-out shall not occur (not higher than –20 °C) 11.4.106
17.16.104.1
17.16.108
112 For type 2.P controls, the method of test 17.101 X
113 The click rate N or switching operations per minute for the purposes of testing to 23 X
CISPR 14-1
114 Rated functioning temperature (T ) 2.2.101.2.1 C
f
17.15.2
115 Ageing temperature for non-bimetallic SOD 17.15.2.2 D
17.15.2.3
116 Rate of rise of temperature for testing non-bimetallic SOD 17.15.2.2 D
17.15.2.3
2.2.107
117 Agricultural thermostat D
6.4.3.106
11.4.107
11.6.3.101
Annex DD
– 14 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
Additional footnotes:
This declaration applies only to temperature sensing controls containing liquid metal. For temperature sensing
controls used in or on self-cleaning ovens, this declaration is the temperature for the cooking operation.
In China, the use of liquid metal in or on cooking or food -handling equipment is not allowed.
In Germany, controls using liquid metal are allowed only with a special marking on the control. Documentation
(D) shall contain a clear warning of the actual danger that may occur. The following symbol shall be used for
marking the control: !
In Canada, the use parts of controls containing mercury is not allowed.
When no minimum is declared, the test value is 15 mA.
Consideration should be given to the provision of information by the equipment manufacturer relating to the
minimum time that the appliance has to be disconnected from the supply to allow a voltage maintained thermal
cut-out to reset.
Determined by the control manufacturer based on the opening temperature of the thermal-cut-out.
Determined by the control manufacturer referring to the actual maximum rate of rise probable in the projected
end-use equipment.
8 Protection against electric shock
This clause of Part 1 is applicable.
9 Provision for protective earthing
This clause of Part 1 is applicable.
10 Terminals and terminations
This clause of Part 1 is applicable.
11 Constructional requirements
This clause of Part 1 is applicable except as follows:
11.1 Materials
Additional subclauses:
11.1.101 Parts containing liquid metal
For controls declared under Table 1, requirement 106, parts that contain mercury (Hg), and
parts of any control that contain sodium (Na), potassium (K), or both, shall be constructed
of metal that has a tensile yield strength at least four times the circumferential (hoop) or other
stress on the parts at a temperature 1,2 times the maximum temperature of the sensing
element (T ).
e
Compliance is checked by inspection of the manufacturer's declaration and by the test
of 18.102.
11.1.102 Material for non-bimetallic SODs
Insulating material used in non-bimetallic SODs as defined in this standard shall comply with
the requirements of IEC 60216-1:2013 and be suitable for the application.
© IEC 2018
11.3 Actuation and operation
11.3.9 Pull-cord actuated control
Addition:
NOTE 101 Note 2 is not applicable to controls classified as type 1.X or 2.X or type 1.Z or 2.Z.
11.4 Actions
11.4.3 Type 2 action
Additional subclauses:
11.4.3.101 Capacitors shall not be connected across the contacts of a thermal cut-out.
11.4.3.102 Constructions requiring a soldering operation to reset thermal cut-outs are not
permitted.
11.4.13 Type 1.K or 2.K action
Additional subclauses:
11.4.13.101 A type 2.K action shall be so designed that in the event of a break in the
sensing element, or in any other part between the sensing element and the switch head,
the declared disconnection or interruption is provided before the sum of the declared
operating value and drift is exceeded.
Compliance is checked by breaking the sensing element. The breaking may be achieved by
partly pre-cutting or filing through.
The temperature sensing control is heated to within 10 K of the operating temperature and
the temperature then increased at a rate not to exceed 1 K/min. The contacts shall open
before the sum of the declared operating value plus drift is exceeded.
11.4.13.102 Type 2.K action may also be achieved by compliance with a), b) or c).
a) Two sensing elements operating independently from each other and actuating one switch
head.
b) Bimetallic sensing elements with
1) exposed elements attached with at least double spot welding of the bimetal at both of
its ends, or
2) elements so located or installed in a control of such construction that the bimetal is
not likely to be physically damaged during installation and use.
c) If the loss of the fluid fill causes the contacts of the control to remain closed or leakage
causes upward shift beyond the declared maximum operating temperature, the bulb and
capillary of a temperature sensing control which is actuated by a change in the pressure
of a fluid confined in the bulb and capillary shall conform to the following.
There shall be no damage to the bulb or capillary to the extent which will permit escape of
any of the fill when an impact tool, as illustrated in Figure 101, is dropped once from a
height of 0,60 m so that the tapered end of the tool strikes the bulb or capillary in a
perpendicular position. For this test, the capillary or the bulb shall be on a concrete
surface.
If the capillary is provided with a separate shroud or sleeve, it is to be left in place during
the test described above.
– 16 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
Dimensions in millimetres
60°
R3,2
L
IEC
Material: Steel, CRS, Break all corners
L to be sized to obtain total mass of 0,454 kg
Figure 101 – Impact tool
Additional subclauses:
11.4.101 Type 2.N action
A type 2.N action shall be so designed that in the event of a leak in the sensing element, or
in any other part between the sensing element and the switch head, the declared
disconnection or interruption is provided before the sum of the declared operating value and
drift is exceeded.
Compliance is checked by the following test:
The operating value of a type 2.N control is measured under the conditions of Clause 15
of Part 1. If the control has means for setting, it is set to the highest value.
After this measurement, a hole is artificially produced in the sensing element and the
measurement of the operating value is repeated.
No positive drift is allowed above the declared value.
A separate shroud or sleeve may be employed for protection of the bulb and capillary to
achieve conformance with Clause 18.
NOTE 1 The test can be replaced by theoretical computations of the physical mode of operation.
NOTE 2 In Canada and the USA, a type 2.N action is checked by item c) of 11.4.13.102.
11.4.102 Type 2.P action
A type 2.P action shall be so designed that it operates in its intended manner after a thermal
cycling test.
Compliance is checked by the test of 17.101.
11.4.103 Bimetallic single-operation device
A bimetallic single-operation device shall be so designed that it does not reset above the
reset value declared in Table 1, requirement 103.
25,4 25,4
© IEC 2018
Compliance is checked by the test of 17.15.
11.4.104 Type 1.X or 2.X
A type 1.X or 2.X action shall be so designed that a turn action can only be accomplished
after the completion of a push-action or a pull-action. Only rotation shall be required to return
the actuating member of the control to the OFF position or rest position.
Compliance is checked by the tests of 18.101.
11.4.105 Type 1.Z or 2.Z
A type 1.Z or 2.Z action shall be so designed that a turn action can only be accomplished
after the completion of a push-action or a pull-action.
Compliance is checked by the tests of 18.101.
11.4.106 Voltage maintained thermal cut-out
A voltage maintained thermal cut-out shall be so designed that it does not reset above the
reset value declared in Table1, requirement 111.
11.4.107 Type 1.AM or 2.AM
A type 1.AM or 2.AM action shall be so designed that it operates in its intended manner after
the declared agricultural environmental exposures.
Compliance is checked by the tests of Annex DD.
11.6 Mounting of controls
11.6.3 Mounting of independently mounted controls
Additional subclause:
11.6.3.101 For agricultural thermostats declared in Table 1, requirement 117, the mounting
method shall be such that the integrity of the protection by the enclosure is not compromised.
Additional subclause:
11.101 Time factor
If a time factor is declared, this shall be checked by one of the applicable determining
methods as indicated in Annex BB. The determined value shall not exceed the rated values.
See Table BB.1.
NOTE In Germany, for temperature sensing controls intended to control boiler water or flue gas temperature in
heat generating systems, the maximum values of time factor given in Table BB.1 shall not be exceeded.
12 Moisture and dust resistance
This clause of Part 1 is applicable except as follows:
Additional subclauses:
– 18 – IEC 60730-2-9:2015+AMD1:2018 CSV
© IEC 2018
12.101 Refrigeration controls
Controls which have the switch head and sensing element mounted in the evaporator of
refrigeration or similar equipment, producing conditions of over temperature and of freezing
and melting, shall maintain insulation integrity.
12.101.1 Compliance is checked by the following tests.
12.101.2 Controls which use a potting compound are given a softening test. Two samples
are heated in a heating chamber at 15 K above the maximum declared operating temperature
for 16 h with the potting surface in the most unfavourable position. The potting material shall
not unduly soften or distort, crack or deteriorate.
12.101.3 The two samples used for the softening tests and one untested sample (three total)
are placed in water maintained between T (maximum declared switch head ambient
max
temperature) and either (T +5) °C or 1,05 times T , whichever is greater for 2 h. The
max max
three samples are then immediately transferred to water at a temperature of below 5 °C for
2 h and then frozen in a small, flexible container at a temperature between T (minimum
min
declared switch head ambient temperature) and (T –5) °C for 2 h. Ten heating-freezing
min
cycles are required.
NOTE In Canada and the USA, if the contact mechanism of defrost controls has the creepage distances and
clearances required for refrigeration controllers, one cycle only of heating and freezing is
...
Frequently Asked Questions
IEC 60730-2-9:2015 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Automatic electrical controls - Part 2-9: Particular requirements for temperature sensing controls". This standard covers: IEC 60730-2-9:2015 applies to automatic electrical temperature sensing controls for use in, on or in association with equipment, including electrical controls for heating, air-conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof. This standard is applicable to automatic electrical temperature sensing controls forming part of a building automation control system within the scope of ISO 16484. This standard also applies to automatic electrical temperature sensing controls for equipment that may be used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications. This standard does not apply to automatic electrical temperature sensing controls intended exclusively for industrial process applications, unless explicitly mentioned in the relevant equipment standard. This standard applies to the inherent safety, to the operating values, operating times, and operating sequences where such are associated with equipment safety, and to the testing of automatic electrical temperature sensing control devices used in, or in association with, equipment. This standard is also applicable to the functional safety of low complexity safety-related temperature sensing controls and systems. This fourth edition cancels and replaces the third edition published in 2008, and its Amendment 1:2011. This edition constitutes a technical revision. This edition includes alignment with the text of 60730-1 fifth edition and the following significant technical changes with respect to the previous edition: - modification of heating-freezing tests in Clause 12; - alignment of the EMC requirements in H.26 to those in other part 2 standards and - addition of requirements in Clause H.27 to cover class B and C control functions of temperature sensing controls. This publication is to be read in conjunction with IEC 60730-1:2013.
IEC 60730-2-9:2015 applies to automatic electrical temperature sensing controls for use in, on or in association with equipment, including electrical controls for heating, air-conditioning and similar applications. The equipment may use electricity, gas, oil, solid fuel, solar thermal energy, etc., or a combination thereof. This standard is applicable to automatic electrical temperature sensing controls forming part of a building automation control system within the scope of ISO 16484. This standard also applies to automatic electrical temperature sensing controls for equipment that may be used by the public, such as equipment intended to be used in shops, offices, hospitals, farms and commercial and industrial applications. This standard does not apply to automatic electrical temperature sensing controls intended exclusively for industrial process applications, unless explicitly mentioned in the relevant equipment standard. This standard applies to the inherent safety, to the operating values, operating times, and operating sequences where such are associated with equipment safety, and to the testing of automatic electrical temperature sensing control devices used in, or in association with, equipment. This standard is also applicable to the functional safety of low complexity safety-related temperature sensing controls and systems. This fourth edition cancels and replaces the third edition published in 2008, and its Amendment 1:2011. This edition constitutes a technical revision. This edition includes alignment with the text of 60730-1 fifth edition and the following significant technical changes with respect to the previous edition: - modification of heating-freezing tests in Clause 12; - alignment of the EMC requirements in H.26 to those in other part 2 standards and - addition of requirements in Clause H.27 to cover class B and C control functions of temperature sensing controls. This publication is to be read in conjunction with IEC 60730-1:2013.
IEC 60730-2-9:2015 is classified under the following ICS (International Classification for Standards) categories: 97.120 - Automatic controls for household use. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 60730-2-9:2015 has the following relationships with other standards: It is inter standard links to IEC 60730-2-9:2015/AMD2:2020, IEC 60730-2-9:2015/AMD1:2018, IEC 60730-2-9:2008/AMD1:2011, IEC 60730-2-9:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 60730-2-9:2015 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...