SIST EN IEC 60947-6-2:2023

SLOVENSKI STANDARD
01-maj-2023
Nizkonapetostne stikalne in krmilne naprave - 6-2. del: Večfunkcijska oprema -
Krmilne in zaščitne stikalne naprave (ali oprema) (CPS) (IEC 60947-6-2:2020 +
COR1:2021)
Low-voltage switchgear and controlgear - Part 6-2: Multiple function equipment - Control
and protective switching devices (or equipment) (CPS) (IEC 60947-6-2:2020 +
COR1:2021)
Niederspannungsschaltgeräte - Teil 6-2: Mehrfunktions-Schaltgeräte - Steuer- und
Schutz-Schaltgeräte (CPS) (IEC 60947-6-2:2020 + COR1:2021)
Appareillage à basse tension - Partie 6-2: Matériels à fonctions multiples - Appareils (ou
matériel) de connexion de commande de protection (ACP) (IEC 60947-6-2:2020 +
COR1:2021)
Ta slovenski standard je istoveten z: EN IEC 60947-6-2:2023
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60947-6-2

NORME EUROPÉENNE
EUROPÄISCHE NORM March 2023
ICS 29.120.40; 29.130.20 Supersedes EN 60947-6-2:2003;
EN 60947-6-2:2003/A1:2007
English Version
Low-voltage switchgear and controlgear - Part 6-2: Multiple
function equipment - Control and protective switching devices (or
equipment) (CPS)
(IEC 60947-6-2:2020 + COR1:2021)
Appareillage à basse tension - Partie 6-2: Matériels à Niederspannungsschaltgeräte - Teil 6-2: Mehrfunktions-
fonctions multiples - Appareils (ou matériel) de connexion Schaltgeräte - Steuer- und Schutz-Schaltgeräte (CPS)
de commande de protection (ACP) (IEC 60947-6-2:2020 + COR1:2021)
(IEC 60947-6-2:2020 + COR1:2021)
This European Standard was approved by CENELEC on 2021-01-19. 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,
Türkiye 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
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60947-6-2:2023 E

European foreword
The text of document 121A/384/FDIS, future edition 3 of IEC 60947-6-2, prepared by SC 121A "Low-
voltage switchgear and controlgear" of IEC/TC 121 "Switchgear and controlgear and their assemblies
for low voltage" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-12-03
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-03-03
document have to be withdrawn
This document supersedes EN 60947-6-2:2003 and all of its 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.
This document has been prepared under a Standardization Request given to CENELEC by the
European Commission and the European Free Trade Association.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60947-6-2:2020 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 standard indicated:
IEC 60034-12:2016 NOTE Approved as EN 60034-12:2017 (not modified)
IEC 60034-30-1 NOTE Approved as EN 60034-30-1
IEC 60068-2-2:2007 NOTE Approved as EN 60068-2-2:2007 (not modified)
IEC 60076-1:2011 NOTE Approved as EN 60076-1:2011 (not modified)
IEC 60079 (series) NOTE Approved as EN IEC 60079 (series)
IEC 60269-1:2006 NOTE Approved as EN 60269-1:2007 (not modified)
IEC 60269-2:2013 NOTE Approved as HD 60269-2:2013
IEC 60381-1:1982 NOTE Approved as HD 452.1 S1:1984 (not modified)
IEC 60664-1:2020 NOTE Approved as EN IEC 60664-1:2020 (not modified)
IEC 60947-4-1:2018 NOTE Approved as EN IEC 60947-4-1:2019 (not modified)
IEC 60990:2016 NOTE Approved as EN 60990:2016 (not modified)
IEC 61000-6-5 NOTE Approved as EN 61000-6-5
IEC 61032 NOTE Approved as EN 61032
IEC 61439 (series) NOTE Approved as EN IEC 61439 (series)
IEC 61649:2008 NOTE Approved as EN 61649:2008 (not modified)
IEC 62061 NOTE Approved as EN IEC 62061
IEC 62477-1:2012 NOTE Approved as EN 62477-1:2012 (not modified) +A11:2014
IEC 62683-1 NOTE Approved as EN 62683-1
IEC/TR 63201 NOTE Approved as CLC IEC/TR 63201
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 60034-1 2017 Rotating electrical machines - Part 1: - -
Rating and performance
IEC 60085 2007 Electrical insulation - Thermal evaluation EN 60085 2008
and designation
IEC 60417 - Graphical symbols for use on equipment - -
IEC 60617 - Graphical symbols for diagrams - -
IEC 60715 2017 Dimensions of low-voltage switchgear and EN 60715 2017
controlgear - Standardized mounting on
rails for mechanical support of switchgear,
controlgear and accessories
IEC 60730-1 - Automatic electrical controls - Part 1: EN 60730-1 -
General requirements
IEC 60947-1 2020 Low-voltage switchgear and controlgear - EN IEC 60947-1 2021
Part 1: General rules
IEC 60947-2 2016 Low-voltage switchgear and controlgear - EN 60947-2 2017
Part 2: Circuit-breakers
+ A1 2019  + A1 2020
IEC 60947-5-1 2016 Low-voltage switchgear and controlgear - EN 60947-5-1 2017
Part 5-1: Control circuit devices and
switching elements - Electromechanical
control circuit devices
IEC 61000-6-2 - Electromagnetic compatibility (EMC) - Part EN IEC 61000-6-2 -
6-2: Generic standards - Immunity
standard for industrial environments
IEC 61051-2 - Varistors for use in electronic equipment - EN IEC 61051-2 -
Part 2: Sectional specification for surge
suppression varistors
CISPR 11 2015 Industrial, scientific and medical equipment EN 55011 2016
- Radio-frequency disturbance
characteristics - Limits and methods of
measurement
+ A1 2016  + A1 2017
- -  + A11 2020
+ A2 2019  + A2 2021
CISPR 32 - Electromagnetic compatibility of multimedia EN 55032 -
equipment - Emission requirements
ISO 3864-2 - Graphical symbols - Safety colours and - -
safety signs - Part 2: Design principles for
product safety labels
IEC 60947-6-2 ®
Edition 3.0 2020-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear –

Part 6-2: Multiple function equipment – Control and protective switching devices

(or equipment) (CPS)
Appareillage à basse tension –

Partie 6-2: Matériels à fonctions multiples – Appareils (ou matériel) de connexion

de commande de protection (ACP)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.40; 29.130.20 ISBN 978-2-8322-9161-0

– 2 – IEC 60947-6-2:2020  IEC 2020
CONTENTS
FOREWORD . 7
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 11
3.1 General . 11
3.2 Terms and definitions related to the equipment . 12
3.3 Terms and definitions concerning characteristic quantities . 13
3.4 Terms and definitions concerning safety aspects . 14
4 Classification . 15
5 Characteristics . 15
5.1 Summary of characteristics . 15
5.2 Type of equipment . 15
5.2.1 Number of poles . 15
5.2.2 Kind of current (alternating current or direct current) . 15
5.2.3 Method of operation . 15
5.2.4 Method of control . 16
5.2.5 Method of resetting after overload . 16
5.2.6 Method of rearming after short-circuit . 16
5.3 Rated and limiting values of the main circuit . 16
5.3.1 Rated voltages . 16
5.3.2 Currents and powers . 16
5.3.3 Rated frequency . 16
5.3.4 Rated duties . 16
5.3.5 Normal load and overload characteristics – Rated making and breaking
capacities . 17
5.3.6 Short circuit characteristics – Rated service short-circuit breaking
capacity (I ) . 17
cs
5.3.7 Pole impedance of a CPS (Z) . 17
5.4 Utilization categories. 17
5.4.1 General . 17
5.4.2 Assignment of utilization categories based on the results of tests . 18
5.4.3 Application of utilization categories for motor control duty . 19
5.5 Control circuits . 19
5.6 Auxiliary circuits . 20
5.7 Relays or releases . 20
5.7.1 Summary of characteristics . 20
5.7.2 Types of relays or releases . 20
5.7.3 Characteristic values . 21
5.7.4 Designation and current setting of overload relays or releases . 21
5.7.5 Time-current characteristics of over current relays or releases . 21
5.7.6 Influence of ambient air temperature. 22
6 Product information . 22
6.1 Nature of information . 22
6.1.1 Identification . 22
6.1.2 Characteristics. 22
6.2 Marking . 23
6.3 Instructions for installation, operation and maintenance . 24

IEC 60947-6-2:2020  IEC 2020 – 3 –
6.4 Environmental information . 24
7 Normal service, mounting and transport conditions . 24
8 Constructional and performance requirements . 25
8.1 Constructional requirements . 25
8.1.1 General . 25
8.1.2 Materials . 25
8.1.3 Current-carrying parts and their connections . 26
8.1.4 Clearances and creepage distances . 26
8.1.5 Actuator . 26
8.1.6 Indication of the contact position . 27
8.1.7 Additional requirements for equipment suitable for isolation . 27
8.1.8 Terminals . 27
8.1.9 Additional requirements for equipment provided with a neutral pole . 27
8.1.10 Provisions for protective earthing . 27
8.1.11 Enclosures for equipment . 27
8.1.12 Degrees of protection of enclosed equipment . 28
8.1.13 Conduit pull-out, torque and bending with metallic conduits . 28
8.1.14 Limited energy source . 28
8.1.15 Stored charge energy circuit . 30
8.1.16 Fault and abnormal conditions . 30
8.1.17 Short-circuit and overload protection of ports . 31
8.2 Performance requirements . 31
8.2.1 Operating conditions . 31
8.2.2 Temperature-rise . 37
8.2.3 Dielectric properties . 39
8.2.4 Performance under no load, normal load and overload conditions . 39
8.2.5 Ability to make, carry and break short-circuit currents . 45
8.2.6 Pole impedance . 46
8.2.7 Leakage currents of equipment suitable for isolation . 46
8.2.8 Coil power consumption . 46
8.2.9 Co-ordination between a CPS and another short-circuit protective
device . 46
8.3 Electromagnetic compatibility (EMC) . 46
8.3.1 General . 46
8.3.2 Immunity . 47
8.3.3 Emission . 47
9 Tests . 48
9.1 Kind of tests . 48
9.1.1 General . 48
9.1.2 Type test . 48
9.1.3 Routine tests . 48
9.1.4 Sampling tests . 48
9.1.5 Special tests . 48
9.2 Compliance with constructional requirements . 49
9.2.1 General . 49
9.2.2 Electrical performance of screwless-type clamping units . 49
9.2.3 Ageing test for screwless-type clamping units . 50
9.2.4 Limited energy source test . 50
9.2.5 Breakdown of components . 51

– 4 – IEC 60947-6-2:2020  IEC 2020
9.3 Compliance with performance requirements . 51
9.3.1 Test sequences . 51
9.3.2 General test conditions . 52
9.3.3 Performance under no load, normal load and overload conditions . 52
9.3.4 Performance under short-circuit conditions . 61
9.4 EMC tests . 63
9.4.1 General . 63
9.4.2 Immunity . 64
9.4.3 Emission . 69
9.5 Test sequences . 70
9.5.1 General . 70
9.5.2 Test sequence I: temperature-rise, operating limits, dielectric properties . 71
9.5.3 Test sequence II: performance under normal load and overload
conditions . 75
9.5.4 Test sequence III: operational performance before and after operating
sequences at conventional prospective current I and conventional
cr
prospective current "r" test . 76
9.5.5 Test sequence IV: operational performance before and after operating
sequences at I . 77
cs
9.5.6 Test sequence V: additional breaking capacity . 78
9.5.7 Test sequence VI: additional test sequence for four-pole CPS's. 78
9.5.8 Test sequence VII: additional test sequence for CPS's intended for use
in an individual enclosure . 79
9.5.9 Test sequence VIII: EMC . 79
9.6 Routine tests. 79
9.6.1 General . 79
9.6.2 Operation and operating limits . 80
9.6.3 Dielectric tests . 80
Annex A (normative) Special tests . 81
A.1 General . 81
A.2 Mechanical durability . 81
A.2.1 General . 81
A.2.2 Verification of mechanical durability . 81
A.3 Electrical durability . 83
Annex B (xxx) Vacant . 84
Annex C (normative) Marking and identification of CPS terminals . 85
C.1 General . 85
C.2 Marking and identification of terminals of main circuits . 85
C.2.1 General . 85
C.2.2 Marking and identification of terminals of auxiliary circuits . 85
Annex D (informative) Items subject to agreement between manufacturer and user . 86
Annex E (xxx) Vacant . 87
Annex F (normative) Requirements for auxiliary contact linked with power contact
(mirror contact) . 88
F.1 Application and object . 88
F.1.1 Application . 88
F.1.2 Object . 88
F.2 Terms and definitions . 88
F.3 Characteristics . 88

IEC 60947-6-2:2020  IEC 2020 – 5 –
F.4 Product information . 88
F.5 Normal service, mounting and transport conditions . 89
F.6 Constructional and performance requirements . 89
F.7 Tests . 89
F.7.1 General . 89
F.7.2 Tests on products in a new condition . 89
F.7.3 Test after conventional operational performance (defined under Table 10) . 90
Annex G (normative) Test sequence for CPS’s for IT systems . 91
G.1 General . 91
G.2 Individual pole short circuit . 91
G.3 Verification of dielectric withstand . 92
G.4 Verification of overload releases . 92
G.5 Marking . 92
Annex H (xxx) Vacant . 93
Annex I (informative) Glossary of symbols and graphical representation of
characteristics . 94
Annex J (xxx) Vacant . 95
Annex K (normative) Procedure to determine data for electromechanical CPS used in
functional safety applications . 96
K.1 General . 96
K.2 Test requirements . 96
K.3 Characterization of a failure mode . 96
K.4 Failure ratios of a CPS . 96
Annex L (xxx) Vacant . 98
Annex M (informative) Load monitoring indicators . 99
M.1 General . 99
M.2 Indicators list . 99
M.3 Uncertainty . 101
M.4 Tests . 102
M.4.1 Routine tests . 102
M.4.2 Type tests . 102
Annex N (normative) Additional requirements and tests for equipment with protective
separation . 104
N.1 General . 104
N.2 Terms and definitions . 104
N.3 Requirements . 104
N.3.1 Test method for implementing protective impedance . 104
N.3.2 Touch current measurement . 105
Bibliography . 107

Figure 1 – Multiple of current setting limits for ambient air temperature time-delay
overload relays or releases (see 8.2.1.5.1) . 34
Figure 2 – Thermal memory test . 36
Figure 3 – Voltage drop measurement at contact point of the clamping terminal . 50
Figure 4 – Example of a pole impedance measurement for a three-pole CPS . 59
Figure 5 – Representation of test current produced by back-to-back thyristors . 67
Figure 6 – Test current for the verification of the influence of the current dips and
interruptions. 68

– 6 – IEC 60947-6-2:2020  IEC 2020
Figure F.1 – Mirror contact . 89
Figure M.1 – Example of quantification of a process change . 101
Figure N.1 – Protection by means of protective impedance . 105
Figure N.2 – Measuring instrument . 106

Table 1 – Utilization categories . 18
Table 20 – Limits for limited energy sources without an over-current protective device . 29
Table 21 – Limits for limited energy sources with an over-current protective device . 29
Table 22 – Limits for limited energy source with current limiting impedance . 30
Table 2 – Limits of operation of inverse time-delay overload relays or releases when
energized on all poles . 33
Table 3 – Trip classes of overload relays or releases for utilization categories AC-2,
AC-3, AC-3e, AC-4, DC-3, DC-5 . 34
Table 4 – Limits of operation of three-pole inverse time-delay overload relays or
releases when energized on two poles only . 35
Table 5 – Temperature-rise limits of terminals . 37
Table 6 – Temperature-rise limits for insulated coils in air . 38
Table 7 – Intermittent duty test cycle data . 38
Table 8 – Rated making and breaking capacities – Making and breaking conditions
corresponding to the utilization categories . 40
Table 9 – Relationship between current broken I and OFF-time for the verification of
c
rated making and breaking capacities . 41
Table 10 – Conventional operational performance after making/breaking capacity tests
– Making and breaking conditions according to utilization category . 43
Table 11 – Operational performance before and after short-circuit tests at I and I –
cr cs
Making and breaking conditions according to utilization category . 44
Table 12 – Value of the prospective test current according to the rated operational
current . 45
Table 13 – Value of the prospective test current according to the rated operational
current (harmonized table) . 46
Table 14 – Performance criteria when EM disturbances are present . 47
Table 15 – EMC immunity tests . 64
Table 16 – Test parameters for harmonics and interruptions . 68
Table 17 – Terminal disturbance voltage limits for conducted radio-frequency emission
(for mains ports) . 69
Table 18 – Radiated emission test limits . 70
Table 19 – Test sequences . 70
Table F.1 – Test voltage according to altitude . 90
Table G.1 – Individual pole . 91
Table K.1 – Failure mode of CPS . 96
Table K.2 – Typical failure ratios for CPS. 97
Table M.1 – AC monitoring indicators list . 100
Table M.2 – Different possibilities authorized for verification of indicators . 102
Table M.3 – Reference for verification conditions . 103
Table M.4 – Harmonic levels . 103

IEC 60947-6-2:2020  IEC 2020 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 6-2: Multiple function equipment –
Control and protective switching devices (or equipment) (CPS)

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,
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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
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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 60947-6-2 has been prepared by subcommittee 121A: Low-voltage
switchgear and controlgear, of IEC technical committee 121: Switchgear and controlgear and
their assemblies for low-voltage.
This third edition cancels and replaces the second edition published in 2002 and its
Amendment 1:2007. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• editorial changes according to ISO/IEC directives Part 2,
• alignments with IEC 60947-1:2020:
– markings ("s", "sol", "r" or "f");
– constructional requirements including material requirements;
– requirements for screwless terminals;

– 8 – IEC 60947-6-2:2020  IEC 2020
– measurement method of the pole impedance;
– EMC requirement and testing;
– procedure to determine data for electromechanical CPS’s used in functional safety
applications;
• harmonisation with IEC 60947-2:2016:
– operation tests of under-voltage relays and shunt releases;
– CPS for IT systems (Annex G);
– coordination with other short-circuit protective devices;
• alignments with IEC 60947-4-1:2018:
– test at the rated conditional short-circuit current I of protected switching devices;
q
– short-circuit tests harmonisation with North America;
– reliability data for functional safety applications (new Annex K);
– safety aspects related to electronic circuits and protective impedance (new Annex N);
– introduction of provisions covering the impact of higher locked rotor current to achieve
high efficiency class;
– mention of dedicated wiring accessories;
– definitions and measurement method of the power consumption of the control circuit
during holding and pick-up operations;
– load monitoring indicators (new Annex M).
The text of this International Standard is based on the following documents:
FDIS Report on voting
121A/384/FDIS 121A/392/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.
A list of all the parts in the IEC 60947 series, under the general title Low-voltage switchgear
and controlgear, can be found on the IEC website.
This document shall be read in conjunction with IEC 60947-1, Low voltage switchgear and
controlgear – Part 1: General rules.
The provisions of the general rules are applicable to this part of IEC 60947-6, where specifically
called for. General rules clauses and subclauses thus applicable as well as tables, figures and
annexes are identified by reference to IEC 60947-1, for example, 1.2.3, Table 4, or Annex A of
IEC 60947-1:2020.
IEC 60947-6-2:2020  IEC 2020 – 9 –
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.
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 docume
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