IEC 60730-2-15:2017

Automatic electrical controls - Part 2-15: Particular requirements for automatic electrical air flow, water flow and water level sensing controls

IEC 60730-2-15:2017 applies to automatic electrical air flow, water flow and water level sensing controls for use in, or in association with, boilers with a maximum pressure rating of 2 000 kPA (20 bar) and equipment for general household and similar use including controls for heating, air-conditioning and similar applications.
Examples are water flow and water level sensing controls of the float or electrode-sensor type used in boiler applications and air flow, water flow and water level sensing controls for swimming pool pumps, water tank pumps, cooling towers, dishwashers, washing machines, air conditioning chillers and ventilation applications.
This document also applies to automatic electrical air flow, water flow and water level 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 third edition cancels and replaces the second edition published in 2008. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition: changes to align with the fifth edition of 60730-1, including the revised title.
This Part 2-15 is intended to be used in conjunction with IEC 60730 1. It was established on the basis of the fifth edition of that standard (2013). Consideration may be given to future editions of, or amendments to, IEC 60730-1.
This Part 2-15 supplements or modifies the corresponding clauses in IEC 60730-1, so as to convert that publication into the IEC standard: Particular requirements for humidity sensing controls.
Where this Part 2-15 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 document indicates that the relevant clause or subclause of Part 1 applies.

Dispositifs de commande électrique automatiques - Partie 2-15: Exigences particulières pour les dispositifs de commande électrique automatiques détecteurs de débit d'air, de débit d'eau et de niveau d'eau

IEC 60730-2-15:2017 s’applique aux dispositifs de commande électrique automatiques détecteurs de débit d'air, de débit d’eau et de niveau d'eau utilisés dans, ou avec, les chaudières de pression assignée maximale de 2 000 kPa (20 bar) et les matériels à usage domestique et analogue, y compris les dispositifs de commande pour le chauffage, le conditionnement d'air et les applications analogues.
Ce sont, par exemple, les dispositifs de commande détecteurs de débit d'eau et de niveau d'eau du type à flotteur ou à électrode utilisés dans les réalisations de chaudières, ainsi que les dispositifs de commande détecteurs de débit d'air, de débit d'eau et de niveau d'eau pour les pompes de piscine, les pompes de réservoir d'eau, les tours de refroidissement, les machines à laver le linge, les lave-vaisselles, les réfrigérants de conditionnement d'air et les réalisations de ventilation.
Le présent document s’applique également aux dispositifs de commande électrique automatiques détecteurs de débit d'air, de débit d'eau et de niveau d'eau pour des matériels qui peuvent être utilisés par le public, tels que les matériels destinés à être utilisés dans des magasins, des bureaux, des hôpitaux, des fermes et des applications commerciales et industrielles.
Cette troisième édition annule et remplace la seconde édition publiée en 2008. Cette édition constitue une révision technique.
Cette édition comprend les modifications techniques majeures suivantes par rapport à l'édition précédente ; modifications pour alignement avec la cinquième édition de l'IEC 60730-1, y compris le titre modifié.
La présente Partie 2-15 doit être utilisée conjointement avec l'IEC 60730-1. Elle a été établie sur la base de la cinquième édition de cette norme (2013). Les éditions futures de l'IEC 60730-1, ou ses amendements, pourront être pris en compte.
La présente Partie 2-15 complète ou modifie les articles correspondants de l'IEC 60730-1 de façon à la transformer en norme IEC: Exigences particulières pour les dispositifs de commande électrique automatiques détecteurs de débit d'air, de débit d'eau et de niveau d'eau.
Lorsque le présent document spécifie "addition", "modification" ou "remplacement", il convient que l'exigence, la modalité d'essai ou le commentaire correspondant de la Partie 1 soit adapté en conséquence.
Lorsqu'aucune modification n'est nécessaire, le présent document indique que l'article ou le paragraphe approprié s’applique.
Mots clés: commande électrique, commande détecteur de niveau, débit d'air, débit d'eau, niveau d'eau

General Information

• Status: Published
• Publication Date: 16-Aug-2017
• ICS: 97.120 - Automatic controls for household use
• Technical Committee: TC 72 - Automatic electrical controls
• Drafting Committee: WG 6 - TC 72/WG 6
• Current Stage: PPUB - Publication issued
• Start Date: 17-Aug-2017
• Completion Date: 09-Sep-2017

Relations

• Revises: IEC 60730-2-15:2008 - Automatic electrical controls for household and similar use - Part 2-15: Particular requirements for automatic electrical air flow, water flow and water level sensing controls
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60730-2-15 ®
Edition 3.0 2017-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Automatic electrical controls –
Part 2-15: Particular requirements for automatic electrical air flow, water flow
and water level sensing controls

Dispositifs de commande électrique automatiques –
Partie 2-15: Exigences particulières pour les dispositifs de commande électrique
automatiques détecteurs de débit d'air, de débit d'eau et de niveau d'eau

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IEC 60730-2-15 ®
Edition 3.0 2017-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Automatic electrical controls –

Part 2-15: Particular requirements for automatic electrical air flow, water flow and

water level sensing controls
Dispositifs de commande électrique automatiques –

Partie 2-15: Exigences particulières pour les dispositifs de commande électrique

automatiques détecteurs de débit d'air, de débit d'eau et de niveau d'eau

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.120 ISBN 978-2-8322-4696-2

– 2 – IEC 60730-2-15:2017 © IEC 2017
CONTENTS
FOREWORD . 3
1 Scope and normative references . 6
2 Terms and definitions . 7
3 General requirements . 9
4 General notes on tests . 9
5 Rating. 9
6 Classification . 9
7 Information . 10
8 Protection against electric shock . 11
9 Provision for protective earthing . 12
10 Terminals and terminations . 12
11 Constructional requirements . 12
12 Moisture and dust resistance . 14
13 Electric strength and insulation resistance . 14
14 Heating . 15
15 Manufacturing deviation and drift . 15
16 Environmental stress . 15
17 Endurance . 16
18 Mechanical strength . 17
19 Threaded parts and connections . 18
20 Creepage distances, clearances and distances through solid insulation . 18
21 Resistance to heat, fire and tracking . 18
22 Resistance to corrosion . 18
23 Electromagnetic compatibility (EMC) requirements – Emission . 19
24 Components . 19
25 Normal operation . 19
26 Electromagnetic compatibility (EMC) requirements – Immunity . 19
27 Abnormal operation . 19
28 Guidance on the use of electronic disconnection . 19
Annex H (normative) Requirements for electronic controls . 20
Annex AA (normative) Independently mounted controls for boiler applications . 28
Annex BB (normative) Requirements for response delay . 29
Annex CC (normative) Independently mounted air flow and water flow sensing controls . 30
Bibliography . 31

Table H.101 – Compliance criteria . 23
Table AA.1 – Number of cycles . 28
Table BB.1 – Deviation and Drift Limits . 29
Table CC.1 – Number of cycles . 30

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUTOMATIC ELECTRICAL CONTROLS –

Part 2-15: Particular requirements for automatic electrical
air flow, water flow and water level 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
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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6) All users should ensure that they have the latest edition of this publication.
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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 60730-2-15 has been prepared by IEC committee 72: Automatic
electrical controls.
This third edition cancels and replaces the second edition published in 2008. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) changes to align with the fifth edition of 60730-1, including the revised title.

– 4 – IEC 60730-2-15:2017 © IEC 2017
The text of this International Standard is based on the following documents:
FDIS Report on voting
72/1080/FDIS 72/1101/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-15 is intended to be used in conjunction with IEC 60730-1. It was established on
the basis of the fifth edition of that standard (2013). Consideration may be given to future
editions of, or amendments to, IEC 60730-1.
This Part 2-15 supplements or modifies the corresponding clauses in IEC 60730-1 so as to
convert that publication into the IEC standard: Particular requirements for automatic electrical
air flow, water flow and water level sensing controls.
Where this document 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 document indicates that the relevant clause or subclause
of Part 1 applies.
In the development of a fully international standard to cover automatic controls for household
and similar use, 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:
• 10.1.4,
• 12.1.101.
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 in the IEC 60730 series, published under the general title Automatic
electrical controls, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 60730-2-15:2017 © IEC 2017
AUTOMATIC ELECTRICAL CONTROLS –

Part 2-15: Particular requirements for automatic electrical
air flow, water flow and water level 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 air flow, water flow and water level
sensing controls for use in, or in association with, boilers with a maximum pressure rating of
2 000 kPA (20 bar) and equipment for general household and similar use including controls
for heating, air-conditioning and similar applications.
NOTE Examples are water flow and water level sensing controls of the float or electrode-sensor type used in
boiler applications and air flow, water flow and water level sensing controls for swimming pool pumps, water tank
pumps, cooling towers, dishwashers, washing machines, air conditioning chillers and ventilation applications.
This document also applies to automatic electrical air flow, water flow and water level 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.
1.1.1
Replacement:
This document applies to the inherent safety, to the operating values, operating sequences
where such are associated with equipment protection, and to the testing of automatic
electrical air flow, water flow and water level sensing controls used in, or in association with,
equipment.
This document is also applicable to controls for appliances within the scope of IEC 60335-1.
Automatic electrical air flow, water flow and water level sensing controls for equipment not
intended for normal household use, but which nevertheless may be used by the public, such
as equipment intended to be used by laymen in shops, in light industry and on farms, are
within the scope of this document.
This document is also applicable to individual controls utilized as part of a control system or
controls which are mechanically integral with multifunctional controls having non-electrical
outputs.
This document is not applicable to pressure sensing controls, requirements for which are
contained in IEC 60730-2-6 .
___________
IEC 60730-2-6, Automatic electrical controls – Part 2-6: Particular requirements for automatic electrical
pressure sensing controls including mechanical requirements.

This document does not apply to air flow, water flow and water level sensing controls
designed exclusively for industrial applications unless explicitly mentioned in the relevant
equipment standard.
NOTE Throughout this document, the word "equipment" means "appliance and equipment".
1.1.2 Addition:
This document applies to automatic electrical controls, mechanically or electrically operated,
responsive to or controlling air flow, water flow and water level.
1.1.3 Not applicable.
NOTE Requirements for manual switches not forming part of an automatic control are contained in IEC 60669 and
IEC 61058-1.
1.1.5 Replacement:
This document applies to a.c. or d.c. automatic electrical air flow, water flow and water level
sensing controls with a rated voltage not exceeding 690 V a.c. or 600 V d.c.
1.1.6 Replacement:
This document takes into account the response value of an automatic action of a control
where such a response value is dependent upon the method of mounting the control. Where a
response value is of significant purpose for the protection of the user, or surroundings, the
value defined in the appropriate household equipment standard or as determined by the
manufacturer shall apply.
1.1.7 Replacement:
This document applies also to controls incorporating electronic devices, requirements for
which are contained in Annex H.
This document applies also to controls using NTC and PTC thermistors, requirements for
which are contained in Annex J.
2 Terms and definitions
This clause of Part 1 is applicable except as follows:
2.2 Definitions of types of control according to purpose
Additional definitions:
2.2.101
boiler water level cut-out
water level sensing control of the float or electrode-sensor type for boiler applications
intended to respond to a low water level during abnormal operating conditions and which has
no provision for setting by the user
Note 1 to entry: A water level cut-out may be of the automatic or of the manual reset type. A boiler water level
cutout is a type of water level protective control (see 2.2.105).

– 8 – IEC 60730-2-15:2017 © IEC 2017
2.2.102
boiler water level limiter
water level sensing control of the float or electrode-sensor type for boiler applications which
is intended to keep a water level below or above one particular value during normal operating
conditions and which may have provision for setting by the user
Note 1 to entry: A boiler water level limiter is normally of the automatic reset type.
2.2.103
boiler water feed control
water level sensing control of the float or electrode-sensor type for boiler applications which
is intended to keep the water level in a boiler above one particular value during normal
operating conditions and which may have provision for setting by the user
Note 1 to entry: A boiler water feed control is of the automatic reset type. A boiler water feed control is used
on a boiler to cycle a feeder pump or feeder water valve. For the purposes of this document, a type 2 boiler water
feed control is considered to be a boiler water level limiter.
2.2.104
water level operating control
control which is intended to keep the water level below or above one particular value during
normal operating conditions and which may have provision for setting by the user
Note 1 to entry: A water level operating control is of the automatic reset type.
2.2.105
water level protective control
control which is intended to prevent a hazardous situation during abnormal operation of the
equipment either by
a) keeping the water level below or above one or more particular values, or by
b) energizing or de-energizing the associated equipment at one or more particular values of
water level
2.2.106
water flow operating control
flow sensing control intended to sense or maintain the water flow between two particular
values during normal operating conditions and which may have provision for setting by the
user
Note 1 to entry: A water flow operating control is of the automatic reset type.
2.2.107
air flow operating control
flow sensing control intended to sense or maintain the air flow between two particular values
during normal operating conditions and which may have provision for setting by the user
Note 1 to entry: An air flow operating control is of the automatic reset type.
2.2.108
water flow cut-out
flow sensing control intended to respond to a lack of water flow during abnormal operating
conditions and which has no provision for setting by the user
Note 1 to entry: A water flow cut-out is of the automatic or manual reset type.
2.2.109
air flow cut-out
flow sensing control intended to respond to a lack of air flow during abnormal operating
conditions and which has no provision for setting by the user
Note 1 to entry: An air flow cut-out is of the automatic or manual reset type.

2.3 Definitions relating to the function of controls
Additional definition:
2.3.101
response delay
delay provided to increase the response value of a water level operating control for the
purpose of preventing unnecessary cycling of the equipment due to fluctuating liquid level
Note 1 to entry: This is usually expressed in units of time.
3 General requirements
This clause of Part 1 is applicable.
4 General notes on tests
This clause of Part 1 is applicable except as follows:
4.1 Conditions of test
4.1.7 Addition:
The rates of change of level or flow declared in Table 1 and used in Clause 17 (i.e. α1, β1,
α2, β2) shall have test tolerances as declared by the manufacturer.
4.3 Instructions for test
Additional subclause:
4.3.1.101 The values in Table AA.1 apply for the testing of independently mounted water
level sensing controls used in boiler applications in Clause 17 unless a higher number is
declared. The values in Table CC.1 apply for the testing of independently mounted air and
water flow sensing controls in Clause 17 unless otherwise declared. Values for integrated
and incorporated controls are specified in the appropriate equipment standard.
4.3.5.1 Modification:
The second sentence is not applicable to combinations of boiler water level sensing controls
using a common sensing mechanism.
5 Rating
This clause of Part 1 is applicable.
6 Classification
This clause of Part 1 is applicable except as follows:
6.3 According to their purpose
6.3.9
Additional subclauses:
– 10 – IEC 60730-2-15:2017 © IEC 2017
6.3.9.101 – boiler water level cut-out;
6.3.9.102 – boiler water level limiter;
6.3.9.103 – boiler water feed control;
6.3.9.104 – water level operating control;
6.3.9.105 – water level protective control;
6.3.9.106 – air flow operating control;
6.3.9.107 – water flow operating control;
6.3.9.108 – air flow cut-out;
6.3.9.109 – water flow cut-out.
6.4 According to features of automatic action
6.4.1
Additional subclause:
6.4.1.101 –  Boiler water feed controls within the scope of this document are classified as
having type 1 action.
For the purpose of this document, a type 2 boiler water feed control is
considered to be a boiler water level limiter.
6.4.2
Additional subclause:
6.4.2.101 – Boiler water level cut-outs and boiler water level limiters within the scope of
this document are classified as having type 2 action.
6.4.3
Additional subclauses:
6.4.3.101 – manual reset boiler water level sensing controls within the scope of this
document shall have a trip-free mechanism classified as type 2.D, 2.H or 2.J
action;
6.4.3.102 – an action incorporating response delay (type 1.AJ or 2.AJ).
6.5 According to the degree of protection and control pollution degree
6.5.2 Addition:
Controls declared in Table 1, requirement 107, to be wholly or partially submerged in water
during usage shall have enclosures classified as IPX8 which provide protection against
continuous immersion in water as specified in IEC 60529.
7 Information
This clause of Part 1 is applicable except as follows:

Table 1 – (7.2 of edition 3) – Required information and methods of providing information
Information Clause or Method
subclause
Modifications:
Temperature limits of mounting surfaces (T )
23 6.12.2, 14.1, 17.3 D
s
27 Number of automatic cycles (A) for each automatic action 6.11, 17.8, 17.9 X
34 Not applicable
44 Not applicable
Additional requirements:
101 Maximum fluid temperature (T ) in °C 14.5.1 D
L
102 Response time, if applicable, for boiler water level sensing controls 15 C

103 Maximum working pressure, if applicable 2.3.29, 18.102 C/D
Method of determining response time for boiler water level sensing
104 15.6.101 X
controls
105 Test method for 18.101.2 for boiler water level sensing controls 18.101.2 X
106 Any special environmental conditions in which the control is intended 12.1.101 D

to be used (other than declared in Table 1, requirement 15)
107 Cord-connected float control which may be wholly or partially 6.5.2, 11.7.1.1, D
submerged in water or any other special environmental conditions 11.7.1.2.1,
declared in requirement 106 11.7.1.2.2,
12.1.101
108 Response delay 2.3.101, 6.4.3.102, D
11.4.101,
H.11.12.8,
Table BB.1
109 Unique or common type reference of special mounting means, if 11.6.3.1 C

any
110 Leveling indication for mounting, if any 11.11.101 C
Additional notes:
The minimum number of automatic cycles is 6 000 for water level sensing controls of the float type.
This information may be taken from the appropriate IEC equipment standard or may be as declared by
the manufacturer.
The unique or common type reference(s) shall be marked on both the mounting means and the control.
Method C is required for air flow, water flow and boiler water level sensing controls.

Modification in Note i of the table:
Replace "Air flow" with "Air flow or water flow".
Addition to Note i:
For water level controls, limits of activating quantity are specified either in the applicable household appliance
standard, by the appliance manufacturer or as declared by the water level control manufacturer (see 17.7 and
17.8).
8 Protection against electric shock
This clause of Part 1 is applicable.

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9 Provision for protective earthing
This clause of Part 1 is applicable.
10 Terminals and terminations
This clause of Part 1 is applicable except as follows:
10.1 Terminals and terminations for external copper conductors
10.1.4 Additional note:
NOTE 101 In Canada and the USA, controls for operation above 50 V shall be provided with suitable wiring
terminals or leads for the connection of fixed wiring conductors having an ampere rating of no less than:
• 1,25 times the ampere rating of a fixed electric space-heating equipment load;
• 1,25 times the full-load motor current rating of a single motor;
• 1,25 times the combination load of a full-load motor current and 1,25 times a fixed electric space-heating
equipment load;
• 1,25 times the full load current of the largest motor plus the full load amperes of the other loads;
• 1,0 times all other loads.
Compliance is checked by inspection.
11 Constructional requirements
This clause of Part 1 is applicable except as follows:
11.4 Actions
11.4.11 Type 1.H or 2.H action
Modification:
Delete the last sentence of the first paragraph.
11.4.12 Type 1.J or 2.J action
Modification:
Delete the last sentence of the first paragraph.
Additional subclause:
11.4.101 Type 1.AJ or 2.AJ action
A type 1.AJ or 2.AJ action shall be designed such that a response delay, as declared, is
provided.
For type 2.AJ action, response delay is checked by the test of 15.5.

11.7 Attachment of cords
11.7.1 Flexing
11.7.1.1 Addition:
For controls declared in Table 1, requirement 107 the appropriate test of 11.7.1.2.1 shall be
conducted.
Additional subclause:
11.7.1.2.1.101
Controls declared in Table 1, requirement 107, are subjected to the following test only.
Three samples of controls declared in Table 1, requirement 107, shall be subjected to a
flexing test while mounted in the flexing apparatus shown in Figure 9. The cord, without any
additional weight, shall be subjected to a minimum backward and forward movement through
an angle of 90°. The cord shall be conducting the maximum rated current at maximum rated
voltage. The number of flexings (that is one movement through 90°) shall be 30 000 at a rate
of 60 flexings per minute.
Immediately following the flexing test, the control shall be subjected to the following
immersion test:
The controls, including their cords, shall be immersed and maintained in water or other
special environmental condition as declared in Table 1, requirements 106 and 107 at T for
L
seven days such that the water, or other environmental condition, is at least 1 m above the
highest point of the float control.
11.7.1.2.2 Addition:
For controls tested in accordance with 11.7.1.2.1.101, the following evaluation criteria are
used: After the test, the control shall comply with the requirements of Clause 8, 12.3 and
Clause 13 for basic insulation, and there shall be no evidence of ingress of the test medium,
compliance for which is checked by inspection.
11.11 Requirements during mounting, maintenance and servicing
Additional subclause:
11.11.101 If the operation of a type 2 water level control of the float type is affected by its
being placed out of level, the control shall be provided with a leveling indicator (e.g. a
bubble, pendulum, horizontal or vertical line).
Compliance is checked by inspection and the test of 15.5.
Additional subclauses:
11.101 Construction requirements relating to operating mechanism
11.101.1 Screws and nuts which attach parts to movable members shall be swaged or
otherwise locked.
NOTE For example, this would apply to the float hinge pivot of a water level sensing control.

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11.101.2 Operating parts shall be separated by barriers or by their physical location from
conductors to be connected to the control to avoid interference with the movement of such
parts by the conductors.
Compliance with 11.101.1 and 11.101.2 is checked by inspection.
12 Moisture and dust resistance
This clause of Part 1 is applicable except as follows.
12.1 Protection against ingress of water and dust
12.1.1 Addition:
For controls declared in Table 1, requirement 107, and having enclosures classified as IPX8,
the requirements of 12.1.2 to 12.1.6, are not applicable.
Compliance is checked by the tests 12.1.101.
Additional subclauses:
12.1.101 Prior to subjecting three samples of the cord-connected float control to the
following immersion test, the control shall be subjected to the impact resistance test in 18.2.
The controls are to be immersed and maintained in the test medium or other special
environmental condition as declared in Table 1, requirements 106 and 107, at T for seven
L
days such that the test medium, or other environmental condition, is at least 1 m above the
highest point of the float control.
After the test, the control shall comply with the requirements of Clauses 8 and 13 and 12.3
for basic insulation, and there shall be no evidence of ingress of the test medium when
compliance is checked by inspection.
12.1.102 Air flow, water flow and water level operating controls which are declared in
Table 1, requirement 106, for use in a special environmental condition shall be evaluated
further for use in this environment.
Compliance is checked by the appropriate tests for the declared environment described in the
relevant IEC standard or by a test method agreed between manufacturer and testing
authority.
After the test, the control is deemed to comply if:
– there is no evidence of ingress of the test medium;
– all actions function automatically and manually in the intended and declared manner, and
– the requirements of 17.5 are still met.
13 Electric strength and insulation resistance
This clause of Part 1 is applicable except as follows:
Additional subclause:
13.101 Electric strength of probes
Probes of electrode-sensor type boiler water level sensing controls shall be subjected to the
following tests:
NOTE The purpose of this test is to evaluate degradation of probe insulating material as a result of exposure to
conditions in the boiler.
Three samples of the probe shall be conditioned for 10 days in a test boiler operating at the
manufacturer's declared maximum working pressure and water temperature. The samples are
then removed from the test boiler and any surface contamination is removed.
The conditioned samples and three unconditioned samples are then immediately subjected to
an increasing voltage until dielectric breakdown occurs.
The average breakdown voltage of the conditioned samples shall be not less than 50 % of the
breakdown voltage of the unconditioned samples and, furthermore, shall be not less than the
appropriate value in Table 12.
14 Heating
This clause of Part 1 is applicable except as follows:
14.4.3.1 Not applicable.
14.5.1 Replacement:
For water flow and water level sensing controls, the control is mounted in the declared
manner with the water maintained at T (Table 1, requirement 101) and, if applicable, at
L
maximum working pressure. The test is conducted with the switch head in an ambient
temperature maintained between T and either (T + 5) °C or 1,05 times T , whichever
max max max
is greater. For water flow sensing controls, the test is conducted with and without water
flowing.
15 Manufacturing deviation and drift
This clause of Part 1 is applicable except as follows:
15.6
Additional subclause:
15.6.101 If a response time has been declared, the response time of the sample shall be
initially measured at T and T and, if an absolute value is declared, shall be within the
max min
manufacturer's declared time. If a range is declared, the initial measured response time shall
be within the declared range.
The measured values for each sample shall be recorded as a reference value, so that
the repeat tests after the environmental tests of Clause 16 and the endurance tests of
Clause 17 will enable the drift to be determined. The values measured during the repeat test
shall be within ±5 % of the initial measured value and, if a range is declared, shall be within
the declared range.
16 Environmental stress
This clause of Part 1 is applicable.

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17 Endurance
This clause of Part 1 is applicable except as follows:
17.1.1 Addition:
Air and water flow sensing controls shall operate as intended. When subjecting the controls
to the requirements of Clause 17, the flow sensing controls shall be actuated and cycled by
means simulating the actual applications. The simulated mechanical cycling means shall be
agreed to between the manufacturer and the test authority. The specified fluid and/or specific
flow rate are not required.
17.1.2.1 Replacement:
Compliance with 17.1.1 and 17.1.2 is checked by the tests of 17.16.
17.16 Test for particular purpose controls
Additional subclauses:
17.16.101 Boiler water level cut-out
• 17.1 to 17.5 inclusive are applicable.
• 17.6 is applicable to actions classified as type 2.M, the value of "X" being as small as
practicable.
• 17.7 and 17.8 are applicable except that, where necessary, the reset operation is obtained
by actuation. This actuation shall be as specified in 17.4 for accelerated speed, as soon
as permitted by the mechanism, or as declared by the manufacturer in Table 1.
• 17.9, 17.11 and 17.12 are not applicable.
• 17.10 and 17.13 do not apply to the normal reset manual action which is tested during the
automatic test of 17.7 and 17.8. If the water level cut-out has other manual actions which
are not tested during the automatic tests, then these subclauses are applicable.
• 17.14 is applicable.
17.16.102 Boiler water level limiter
• 17.1 to 17.5 inclusive are applicable.
• 17.6 is applicable to actions classified as type 2.M, the value of "X" being as small as
practicable.
• 17.7 and 17.8 are applicable except that, where necessary, the reset operation is obtained
by actuation. This actuation shall be as specified in 17.4 for accelerated speed, as soon
as permitted by the mechanism, or as declared by the manufacturer in Table 1.
• 17.9 to 17.13 inclusive are not applicable.
• 17.14 is applicable.
17.16.103 Boiler water feed controls
• 17.1 to 17.5 inclusive are applicable.
• 17.6 is applicable to actions classified as type 2.M, the value of "X" being as small as
practicable.
• 17.7 and 17.8 are applicable except that, where necessary, the reset operation is obtained
by actuation. This actuation shall be as specified in 17.4 for accelerated speed, as soon
as permitted by the mechanism, or as declared by the manufacturer in Table 1.
• 17.9 is applicable.
• 17.10 to 17.13 are not applicable.

• 17.14 is applicable.
17.16.104 Water level operating controls
• 17.1 to 17.5 inclusive are applicable.
• 17.6 is not applicable.
• 17.7 and 17.8 are applicable.
• 17.9 to 17.13 are not applicable.
• 17.14 is applicable.
17.16.105 Water level protective controls
• 17.1 to 17.5 inclusive are applicable.
• 17.6 is not applicable.
• 17.7 and 17.8 are applicable.
• 17.9 to 17.13 are not applicable.
• 17.14 is applicable.
17.16.106 Air and water flow sensing controls
• 17.1 to 17.5 inclusive are applicable.
• 17.6 is not applicable.
• 17.7 and 17.8 are applicable except that, where necessary, the reset operation is obtained
by actuation. This actuation shall be as specified in 17.4 for accelerated speed, as
permitted by the mechanism, or as declared by the manufacturer in Table 1.
• 17.9 to 17.14 inclusive are applicable.
18 Mechanical strength
This clause of Part 1 is applicable except as follows:
Additional subclauses:
18.101 Those parts of a boiler water level sensing control which are exposed to boiler
pressure shall be capable of withstanding for 1 min without bursting, a hydraulic pressure
equal to 400 % of the maximum working pressure declared in Table 1, requirement 103.
The float assembly of a float-operated boiler water level sensing control shall withstand
200 % of the maximum working pressure declared in Table 1, requirement 103, when tested
as declared in Table 1, requirement 105.
Compliance is checked by the tests of this subclause.
18.101.1 Except for electrode-sensor type boiler water level sensing controls, one sample
is subjected to the test.
For electrode-sensor type boiler water level sensing controls, one sample subjected to the
test of 13.101 shall be used. In addition, a second previously untested sample of the
electrode-sensor type is used after being conditioned for 30 days in an oven maintained at a
temperature between 102 % and 105 % of the declared maximum water temperature (Table 1,
requirement 101).
The boiler water level sensing control is to be fitted to a tank filled with water and connected
to a hydraulic pump. The pressure is to be raised gradually to 400 % of the decla
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