SIST EN IEC 60730-2-22:2020
(Main)Automatic electrical controls for household and similar use - Part 2-22: Particular requirements for thermal motor protectors
Automatic electrical controls for household and similar use - Part 2-22: Particular requirements for thermal motor protectors
EN-IEC 60730-2-22 applies to the partial evaluation of thermal motor protectors asdefined in IEC 60730-1 for household and similar use, including heating, air conditioning andsimilar applications as well as for sealed (hermetic and semi-hermetic type) motorcompressors.NOTE A thermal motor protector is considered an integrated control since its protective functionality isdependent on the correct mounting and fixing in or on a motor and which can only be fully tested in combinationwith the relevant motor. This dependency is illustrated by:• the ability of the thermal motor protector to accurately and reliably sense the heat of the motor windings;thus, addressing the over-temperature protection due to motor overload conditions;• the ability of the thermal motor protector to accurately and reliably sense the current due to motor lockedrotorconditions; thus, reducing the response time and not being adversely affected by heat-sink at theassembly spot in the application;• the influence of the motor’s electromagnetic field on the switch behaviour of the thermal motor protector;particularly, affecting the arc direction between the contacts resulting in uneven wear of the contact materialand eventually leading to failure of operation.Requirements concerning the testing of the combination of sealed (hermetic and semihermetictype) motor-compressors and thermal motor protectors are given inIEC 60335-2-34.
Automatische elektrische Regel- und Steuergeräte für den Hausgebrauch und ähnliche Anwendungen - Teil 2-2: Besondere Anforderungen an thermisch wirkende Motorschutzeinrichtungen
Dispositifs de commande électrique automatiques à usage domestique et analogue - Partie 2-2: Règles particulières pour les dispositifs thermiques de protection des moteurs
L'IEC 60730-2-22:2014 s'applique à l'évaluation partielle des protecteurs thermiques tels que définis dans l'IEC 60730-1 pour usages domestiques et analogues, y compris pour le chauffage, l'air conditionné et applications analogues, ainsi qu'aux motocompresseurs étanches (de type hermétique et hermétique accessible). Un protecteur thermique est considéré comme un dispositif de commande intégrée, sa fonction de protection dépendant de son montage et de sa fixation correcte dans ou sur un moteur, et qui ne peut être complètement soumis à essai qu'en association avec le moteur concerné. Cette dépendance est illustrée par:
- l'aptitude du protecteur thermique à détecter de manière précise et fiable la chaleur des enroulements du moteur et donc à assurer, la protection contre la surchauffe en raison des conditions de surcharge du moteur;
- l'aptitude du protecteur thermique à détecter de manière précise et fiable le courant en raison de conditions de rotor bloqué et donc, à réduire le temps de réponse et à ne pas être affecté par le dissipateur thermique sur le lieu d'assemblage dans l'application;
- l'influence du champ électromagnétique du moteur sur le comportement du commutateur du protecteur thermique, affectant, en particulier, la direction d'arc entre les contacts résultant d'une usure inégale du matériau de contact, et donnant éventuellement lieu à une défaillance de fonctionnement. Les exigences relatives à l'essai de la combinaison des motocompresseurs étanches (de type hermétique et hermétique accessible) et des protecteurs thermiques sont données dans l'IEC 60335-2-34. La présente norme s'applique aux protecteurs thermiques utilisant des thermistances CTN ou CTP, dont les exigences supplémentaires sont contenues dans l'Annexe J.
Mots-clés: Thermique, Protecteurs thermiques, Commande intégrée
Avtomatske električne krmilne naprave - 2-22. del: Posebne zahteve za naprave za toplotno zaščito motorjev
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 60730-2-22:2020
01-maj-2020
Nadomešča:
SIST EN 60730-2-2:2002
SIST EN 60730-2-2:2002/A1:2006
SIST EN 60730-2-2:2002/A11:2005
SIST EN 60730-2-4:2008
Avtomatske električne krmilne naprave - 2-22. del: Posebne zahteve za naprave za
toplotno zaščito motorjev
Automatic electrical controls for household and similar use - Part 2-22: Particular
requirements for thermal motor protectors
Automatische elektrische Regel- und Steuergeräte für den Hausgebrauch und ähnliche
Anwendungen - Teil 2-2: Besondere Anforderungen an thermisch wirkende
Motorschutzeinrichtungen
Dispositifs de commande électrique automatiques à usage domestique et analogue -
Partie 2-2: Règles particulières pour les dispositifs thermiques de protection des moteurs
Ta slovenski standard je istoveten z: EN IEC 60730-2-22:2020
ICS:
97.120 Avtomatske krmilne naprave Automatic controls for
za dom household use
SIST EN IEC 60730-2-22:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 60730-2-22:2020
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SIST EN IEC 60730-2-22:2020
EUROPEAN STANDARD EN IEC 60730-2-22
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2020
ICS 97.120 Supersedes EN 60730-2-2:2002, EN 60730-2-4:2007
and all of their amendments and corrigenda (if any)
English Version
Automatic electrical controls - Part 2-22: Particular requirements
for thermal motor protectors
(IEC 60730-2-22:2014)
Dispositifs de commande électrique automatiques - Partie Automatische elektrische Regel- und Steuergeräte - Teil 2-
2-22: Exigences particulières pour les protecteurs 22: Besondere Anforderungen an thermisch wirkende
thermiques Motorschutzeinrichtungen
(IEC 60730-2-22:2014) (IEC 60730-2-22:2014)
This European Standard was approved by CENELEC on 2019-10-14. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60730-2-22:2020 E
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EN IEC 60730-2-22:2020 (E)
European foreword
The text of document 72/941/FDIS, future edition 1 of IEC 60730-2-22, prepared by IEC/TC 72
"Automatic electrical controls" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60730-2-22:2020.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-08-14
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2023-02-14
document have to be withdrawn
This document supersedes EN 60730-2-4:2007 and EN 60730-2-2:2002 and all of their amendments
and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60730-2-22:2014 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60034-11:2004 NOTE Harmonized as EN 60034-11:2004 (not modified)
IEC 60335 (series) NOTE Harmonized as EN 60335 (series)
IEC 60730 (series) NOTE Harmonized as EN IEC 60730 (series)
IEC 60730-2-9:2008 NOTE Harmonized as EN 60730-2-9:2010 (modified)
2
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EN IEC 60730-2-22:2020 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60269-3 - Low-voltage fuses - Part 3: Supplementary HD 60269-3 -
requirements for fuses for use by unskilled
persons (fuses mainly for household or
similar applications) - Examples of
standardized systems of fuses A to F
IEC 60335-2-34 2012 Household and similar electrical appliances EN 60335-2-34 2013
- Safety - Part 2-34: Particular
requirements for motor-compressors
3
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SIST EN IEC 60730-2-22:2020
IEC 60730-2-22
®
Edition 1.0 2014-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Automatic electrical controls – Part 2-22: Particular requirements for thermal
motor protectors
Dispositifs de commande électrique automatiques –
Partie 2-22: Exigences particulières pour les protecteurs thermiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX U
ICS 97.120 ISBN 978-2-8322-1577-7
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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CONTENTS
FOREWORD . 4
1 Scope and normative references . 7
2 Definitions . 8
3 General requirements . 8
4 General notes on tests . 8
5 Rating. 8
6 Classification . 9
7 Information . 10
8 Protection against electric shock . 10
9 Provision for protective earthing . 11
10 Terminals and terminations . 11
11 Constructional requirements . 11
12 Moisture and dust resistance . 11
13 Electric strength and insulation resistance . 12
14 Heating . 12
15 Manufacturing deviation and drift . 12
16 Environmental stress . 12
17 Endurance . 12
18 Mechanical strength . 14
19 Threaded parts and connections . 15
20 Creepage distances, clearances and distances through solid insulation . 15
21 Resistance to heat, fire and tracking . 15
22 Resistance to corrosion . 15
23 Electromagnetic compatibility (EMC) requirements – emission . 16
24 Components . 16
25 Normal operation . 16
26 Electromagnetic compatibility (EMC) requirements – immunity . 16
27 Abnormal operation . 16
28 Guidance on the use of electronic disconnection . 16
Annexes . 17
Annex E (normative) Circuit for measuring leakage current . 17
Annex AA (informative) Endurance test for thermal motor protectors as components,
i.e. not installed on a motor . 18
Annex BB (informative) Testing of the combination of motor and thermal motor
protectors (not applicable to sealed motor-compressors) . 20
Annex CC (informative) Additional information on the application of motor protectors
in pollution degree 1, 2 and 3 . 27
Bibliography . 28
Figure 101 – Limited short circuit test scheme . 14
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Table 1 . 10
Table 101 – Limited short-circuit capacity (applicable in Canada and the USA) . 13
Table BB.101 – Additional required information and methods of providing information . 21
Table BB.201 – Maximum allowable temperatures on running loads . 23
Table BB.202 – Maximum continuous running overload current permitted by thermal
protector as percentage of nominal full load motor current . 23
Table BB.203 – Maximum allowable temperatures for locked rotor conditions . 24
Table CC.1 . 27
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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
AUTOMATIC ELECTRICAL CONTROLS–
Part 2-22: Particular requirements for thermal motor protectors
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 60730-22 has been prepared by IEC technical committee 72:
Automatic electrical controls.
The text of this standard is based on the following documents:
FDIS Report on voting
72/941/FDIS 72/950/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 publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
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IEC 60730-2-22:2014 © IEC 2014 – 5 –
This Part 2-22 is intended to be used in conjunction with IEC 60730-1. It was established on
1
the basis of the fourth edition (2010) of that standard . Consideration may be given to future
editions of, or amendments to, IEC 60730-1.
This Part 2-22 supplements or modifies the corresponding clauses in IEC 60730-1 so as to
convert that publication into the IEC standard: Safety requirements for automatic electrical
thermal motor protectors.
Where this Part 2-22 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 2-22 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 practice are contained in the
following subclauses:
– 7.2.6 (Canada, USA)
– 12.2 (Canada, Japan, USA)
– 17.101.2.1.2 (Canada, USA)
– 18.1.3.101.2 (Canada, USA)
– BB17.205.1.2 (Canada, USA)
In this publication:
1) The following print types are used:
– Requirements proper: in roman type;
– Test specifications: in italic type;
– Explanatory matter; 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, under the general title Automatic electrical controls
for household and similar use, can be found on the IEC website.
___________
1
A fifth edition of IEC 60730-1 was published in 2013.
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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.
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AUTOMATIC ELECTRICAL CONTROLS–
Part 2-22: Particular requirements for thermal motor protectors
1 Scope and normative references
2
This clause of Part 1 is applicable except as follows:
1.1 Replacement:
This part of IEC 60730 applies to the partial evaluation of thermal motor protectors as
defined in IEC 60730-1 for household and similar use, including heating, air conditioning and
similar applications as well as for sealed (hermetic and semi-hermetic type) motor-
compressors.
NOTE A thermal motor protector is considered an integrated control since its protective functionality is
dependent on the correct mounting and fixing in or on a motor and which can only be fully tested in combination
with the relevant motor. This dependency is illustrated by:
• the ability of the thermal motor protector to accurately and reliably sense the heat of the motor windings;
thus, addressing the over-temperature protection due to motor overload conditions;
• the ability of the thermal motor protector to accurately and reliably sense the current due to motor locked-
rotor conditions; thus, reducing the response time and not being adversely affected by heat-sink at the
assembly spot in the application;
• the influence of the motor’s electromagnetic field on the switch behaviour of the thermal motor protector;
particularly, affecting the arc direction between the contacts resulting in uneven wear of the contact material
and eventually leading to failure of operation.
Requirements concerning the testing of the combination of sealed (hermetic and semi-
hermetic type) motor-compressors and thermal motor protectors are given in
IEC 60335-2-34.
This standard applies to thermal motor protectors using NTC or PTC thermistors, additional
requirements for which are contained in Annex J.
1.1.1 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 thermal motor protectors used in or on household or similar equipment as well
as sealed (hermetic and semi-hermetic type) motor-compressors.
This standard applies to thermal motor protectors for appliances within, but not limited to,
the scope of IEC 60335-1 and its Part 2’s.
NOTE Throughout this standard, the word “equipment” means “appliance and equipment”.
Thermal motor protectors 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 standard.
This standard does not apply to thermal motor protectors designed exclusively for industrial
applications.
1.1.2 This standard does not apply to other means of motor protection.
___________
2
References to "Part 1" in this document pertain to the fourth edition of IEC 60730-1 published in 2010.
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1.1.3 This standard does not apply to a manual device for opening the circuit.
1.5 Normative references
Addition:
IEC 60269-3, Low-voltage fuses – Part 3: Supplementary requirements for fuses for use by
unskilled persons (fuses mainly for household and similar applications) – Examples of
standardized systems of fuses A to F
IEC 60335-2-34:2012, Household and similar electrical appliances – Safety – Part 2-34:
Particular requirements for motor-compressors
2 Definitions
This clause of Part 1 is applicable except as follows:
2.6 Definitions of type of automatic action of a control according to test procedure
Additional definition:
2.6.101
type 3 action
automatic action for which reliability of the operating characteristics can only be evaluated in
terms of measurements made on the protected motor or motor compressor
2.13 Miscellaneous definitions
Additional definition:
2.13.101
sealed motor-compressor
mechanical compressor (of a hermetic or semi-hermetic type) consisting of a compressor and
a motor, both of which are enclosed in the same sealed housing with no external shaft seals,
the motor operating in a refrigerant atmosphere
Note 1 to entry: The enclosure may be permanently sealed by welding or brazing (hermetic compressor) or may
be sealed by one or more gasketed joints (semi-hermetic compressor).
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:
4.3.1.1 and 4.3.1.2 Not applicable.
4.3.2 Not applicable.
5 Rating
This clause of Part 1 is applicable.
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6 Classification
This clause of Part 1 is applicable except as follows:
6.4 According to features of automatic action
6.4.1 Not applicable.
6.4.2 Replacement:
– Type 3 action.
6.4.3 Replacement:
Type 3 actions are further classified according to one or more of the following constructional
or operational features:
NOTE 1 These further classifications are only applicable if the relevant declarations have been made and any
appropriate tests completed.
NOTE 2 An action providing more than one feature is classified by a combination of the appropriate letters, for
example, Type 3.C.L.
NOTE 3 A manual action is not classified according to 6.4.3.
6.4.3.1 Void
6.4.3.2 – micro-disconnection on operation (Type 3.B);
6.4.3.3 – micro-interruption on operation (Type 3.C);
6.4.3.4 Void
6.4.3.5 Void
6.4.3.6 Void
6.4.3.7 Void
6.4.3.8 – a trip-free mechanism in which the contacts cannot be prevented from opening and
which may automatically be reset to the “closed” position after normal operation conditions
have been restored if the reset means is held in the “reset” position (Type 3.H);
6.4.3.101 Thermal motor protectors are further classified according to the following
constructional or operational features:
– non-self-resetting (Type 3.B.H);
– self-resetting (Type 3.C).
Additional subclause:
6.101 According to limited short-circuit capability
NOTE For limited short-circuit test details, refer to 17.101.
Not all designs of devices are capable of sustaining or interrupting the short-circuit current
without introducing a fire hazard. There is definite evidence that a short circuit in an
unprotected motor by itself may not necessarily introduce a fire hazard because the circuit is
safely de-energized by the opening of the mains overcurrent device. But if there is a thermal
protector in the path of the fault current, a fire may result from an arcing disturbance when
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this protector attempts to clear the fault. Such disturbances can and do occur before the
mains overcurrent device has an opportunity to open. The tests of 17.101 are designed to
assess the operation of a thermal motor protector under these conditions.
7 Information
This clause of Part 1 is applicable except as follows:
7.2.6 Replacement:
For thermal motor protectors, information shall be provided as indicated in Table 1.
7.2.9 Replacement of the existing Table 1 by the following new table:
Table 1
Information Clause or subclause Method
1 Manufacturer’s name or trade mark 7.2.6 C
a
2 Unique type reference 2.11.1, 2.13.1, 7.2.6 C
3 Rated voltage or rated voltage range in volts (V) 2.1.2 D
6 Purpose of control 4.3.5, 6.3 X
30 PTI of materials used for insulation 6.13 X
31 Method of mounting control 11.6 X
31a Method of providing earthing of control 7.4.3, 9 D
b
43 Reset characteristics for cut-out action 6.4, 11.4 X
49 Control pollution degree 6.5.3 X
51 Heat and fire resistance category 21 X
77 Temperature for the ball pressure test 21.2.1, 21.2.2, D
21.2.3 and 21.2.4
101 Limited short-circuit capability in terms of prospective current, 6.101, 17.101 X
c
voltage and rated current and characteristic of fuse, if declared
d
102 Features of automatic actions 6.4 D
103 Maximum pressure for controls located within the sealed 18.1.3.101.1 D
e
compressor enclosure
a
The unique type reference shall be such that, when it is quoted in full, the manufacturer of the control can
supply a replacement which will be fully interchangeable with the original electrically, mechanically,
dimensionally and functionally.
It may comprise a series type reference with other marking, such as voltage rating or an ambient temperature
marking, which together provide a unique type reference.
b
Manufacturers may declare a lower ambient temperature than that specified in 11.4.102.
c
Applicable in Canada and the USA.
d
Thermal motor protectors are classified as Type 3.B.H and Type 3.C.
e
The test pressure depends on the intended refrigerant and the location of the protector inside the compressor
(high side or low side). Values can be taken from 22.7 of IEC 60335-2-34:2012.
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 Not applicable.
10.2 Terminals and terminations for internal conductors
Addition:
NOTE For the purpose of this standard, internal conductors are considered as integrated conductors.
11 Constructional requirements
This clause of Part 1 is applicable except as follows:
11.3.4 Setting by the manufacturer
Addition:
NOTE Sealing compounds, lock nuts and the like are deemed adequate for this purpose.
11.4 Actions
Additional subclauses:
11.4.101 A Type 3.B.H action shall operate to provide the electric strength requirements
specified for micro-disconnection.
Compliance is checked by the tests of Clause 13 and the relevant requirements of Clause 20.
11.4.102 A Type 3.B.H action shall be so designed that the contacts cannot be prevented
from ope
...
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