Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Devices for protection for safety, isolation, switching, control and monitoring

IEC 60364-5-53:2019 Deals with general requirements for isolation, switching and control and with the requirements for selection and erection of the devices provided to fulfil such functions. This fourth edition cancels and replaces the third edition published in 2001, Amendment 1:2002 and Amendment 2:2015. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) revision of all clauses except 531 and 534;
b) introduction of a new Clause 537 Monitoring;
c) Clause 530 contains all normative references and all terms and definitions.

Installations électriques à basse tension - Partie 5-53: Choix et mise en œuvre des matériels électriques – Dispositifs de protection pour assurer la sécurité, le sectionnement, la coupure, la commande et la surveillance

L'IEC 60364-5-53:2019 traite des exigences relatives:
a) au sectionnement, à la coupure, à la commande et à la surveillance, et
b) au choix et à la mise en œuvre des:
1) dispositifs pour le sectionnement, la coupure, la commande et la surveillance, et
2) dispositifs pour assurer la conformité aux mesures de protection en vue de la sécurité.
Cette quatrième édition annule et remplace la troisième édition parue en 2001, l’Amendement 1:2002 et l’Amendement 2:2015. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) révision de tous les articles à l’exception des articles 521 et 534;
b) introduction d’un nouvel Article 537, Surveillance;
c) l’Article 530 contient toutes les références normatives et l’ensemble des termes et définitions.

General Information

Status
Published
Publication Date
20-Feb-2019
Current Stage
PPUB - Publication issued
Completion Date
21-Feb-2019
Ref Project

Buy Standard

Standard
IEC 60364-5-53:2019 - Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Devices for protection for safety, isolation, switching, control and monitoring
English and French language
152 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

IEC 60364-5-53
Edition 4.0 2019-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage electrical installations –
Part 5-53: Selection and erection of electrical equipment – Devices
for protection for safety, isolation, switching, control and monitoring
Installations électriques à basse tension –
Partie 5-53: Choix et mise en œuvre des matériels électriques – Dispositifs
de protection pour assurer la sécurité, le sectionnement, la coupure,
la commande et la surveillance
IEC 60364-5-53:2019-02(en-fr)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2019 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form

or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from

either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC

copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or

your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite

ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie

et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des

questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez

les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC

The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes

International Standards for all electrical, electronic and related technologies.
About IEC publications

The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the

latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org

The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,

variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English

committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.

and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary

details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and

once a month by email. French extracted from the Terms and Definitions clause of

IEC publications issued since 2002. Some entries have been

IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and

If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC

La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des

Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC

Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la

plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - Electropedia - www.electropedia.org

webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au

La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en

en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans

comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire

projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary

Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais

Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des

Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées

antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
---------------------- Page: 2 ----------------------
IEC 60364-5-53
Edition 4.0 2019-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage electrical installations –
Part 5-53: Selection and erection of electrical equipment – Devices
for protection for safety, isolation, switching, control and monitoring
Installations électriques à basse tension –
Partie 5-53: Choix et mise en œuvre des matériels électriques – Dispositifs
de protection pour assurer la sécurité, le sectionnement, la coupure,
la commande et la surveillance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.01; 91.140.50 ISBN 978-2-8322-7598-6

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
---------------------- Page: 3 ----------------------
– 2 – IEC 60364-5-53:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 6

530.1 Scope ..................................................................................................................... 8

530.2 Normative references .............................................................................................. 8

530.3 Terms and definitions ............................................................................................ 11

530.4 General and common requirements....................................................................... 14

530.5 Erection of equipment ........................................................................................... 14

531 Devices for protection against indirect contact by automatic disconnection of

supply............................................................................................................................ 14

531.1 Overcurrent protective devices .............................................................................. 14

531.1.1 TN systems ................................................................................................... 14

531.1.2 TT systems .................................................................................................... 14

531.1.3 IT systems ..................................................................................................... 15

531.2 Residual current protective devices....................................................................... 15

531.2.1 General conditions of installation ................................................................... 15

531.2.2 Selection of devices according to their method of application ........................ 15

531.2.3 TN systems ................................................................................................... 15

531.2.4 TT systems .................................................................................................... 16

531.2.5 IT systems ..................................................................................................... 16

531.3 Insulation monitoring devices ................................................................................ 16

532 Devices and precautions for protection against thermal effects ...................................... 16

532.1 General ................................................................................................................. 16

532.2 Locations with a particular risk of fire .................................................................... 16

532.2.1 General ......................................................................................................... 16

532.2.2 Locations with external influences BD2, BD3 or BD4 ..................................... 17

532.2.3 Locations with external influences BE2 .......................................................... 17

532.3 Selection of arc fault detection devices (AFDD) .................................................... 18

533 Devices for protection against overcurrent ..................................................................... 18

533.1 General requirements ........................................................................................... 18

533.1.1 General ......................................................................................................... 18

533.1.2 Compliance with standards ............................................................................ 18

533.1.3 Fuses ............................................................................................................ 19

533.2 Selection of devices for protection against overload current .................................. 19

533.2.1 General ......................................................................................................... 19

533.2.2 Presence of harmonic currents ...................................................................... 20

533.2.3 Unequal current sharing between parallel conductors .................................... 20

533.3 Selection of devices for protection against short-circuit current ............................. 20

533.3.1 Thermal stresses ........................................................................................... 20

533.3.2 Breaking capacity .......................................................................................... 21

533.4 Positioning of overcurrent protection devices ........................................................ 21

533.4.1 General ......................................................................................................... 21

533.4.2 Positioning of devices for overload protection ................................................ 21

533.4.3 Positioning of devices for short-circuit protection ........................................... 22

533.5 Co-ordination of overload and short-circuit protective functions............................. 23

533.5.1 Protective functions provided by one device .................................................. 23

533.5.2 Protective functions provided by separate devices ......................................... 23

534 Devices for protection against transient overvoltages .................................................... 23

---------------------- Page: 4 ----------------------
IEC 60364-5-53:2019 © IEC 2019 – 3 –

534.1 General ................................................................................................................. 23

534.2 Void ...................................................................................................................... 24

534.3 Void ...................................................................................................................... 24

534.4 Selection and erection of SPDs ............................................................................. 24

534.4.1 SPD location and SPD test class ................................................................... 24

534.4.2 Transient overvoltage protection requirements .............................................. 25

534.4.3 Connection types ........................................................................................... 25

534.4.4 Selection of SPDs .......................................................................................... 27

534.4.5 Protection of the SPD against overcurrent ..................................................... 31

534.4.6 Fault protection ............................................................................................. 33

534.4.7 SPDs installation in conjunction with RCDs.................................................... 34

534.4.8 Connections of the SPD ................................................................................. 34

534.4.9 Effective protective distance of SPDs ............................................................ 36

534.4.10 Connecting conductors of SPDs .................................................................... 37

535 Co-ordination of protective devices ................................................................................ 37

535.1 Selectivity between overcurrent protective devices ............................................... 37

535.1.1 General ......................................................................................................... 37

535.1.2 Partial selectivity ........................................................................................... 38

535.1.3 Full selectivity ................................................................................................ 38

535.1.4 Total selectivity .............................................................................................. 38

535.1.5 Enhanced selectivity ...................................................................................... 38

535.2 Co-ordination between residual current protective devices and OCPDs................. 39

535.3 Selectivity between residual current protective devices ......................................... 39

535.4 Selectivity of RCD and OCPD ............................................................................... 39

535.5 Combined short-circuit protection of OCPDs ......................................................... 39

536 Isolation and switching .................................................................................................. 40

536.2 Isolation ................................................................................................................ 40

536.2.1 General ......................................................................................................... 40

536.2.2 Devices for isolation ...................................................................................... 41

536.3 Switching-off for mechanical maintenance ............................................................ 42

536.3.1 General ......................................................................................................... 42

536.3.2 Devices for switching-off for mechanical maintenance ................................... 42

536.4 Emergency switching ............................................................................................ 43

536.4.1 General ......................................................................................................... 43

536.4.2 Devices for emergency switching-off .............................................................. 43

536.4.3 Devices for emergency stopping .................................................................... 44

536.5 Functional switching (control) ................................................................................ 44

536.5.1 General ......................................................................................................... 44

536.5.2 Devices for functional switching ..................................................................... 44

537 Monitoring ..................................................................................................................... 45

537.1 General ................................................................................................................. 45

537.1.1 Monitoring devices ......................................................................................... 45

537.1.2 Selection of insulation monitoring devices (IMDs) .......................................... 45

537.1.3 Selection of residual current monitoring devices (RCMs) ............................... 45

537.2 IT systems for continuity of supply ........................................................................ 45

537.2.1 General ......................................................................................................... 45

537.2.2 Insulation monitoring devices (IMDs) ............................................................. 46

537.2.3 Installation of IMDs ........................................................................................ 46

537.3 IT public distribution system .................................................................................. 46

---------------------- Page: 5 ----------------------
– 4 – IEC 60364-5-53:2019 © IEC 2019

537.4 Off-line systems in TN, TT and IT systems ............................................................ 46

Annex A (informative) Position of devices for overload protection ........................................ 48

A.1 General ................................................................................................................. 48

A.2 Cases where overload protection need not be placed at the origin of the

branch circuit ........................................................................................................ 48

Annex B (informative) Position of devices for short-circuit protection ................................... 50

B.1 General ................................................................................................................. 50

B.2 Cases where short-circuit protection need not be placed at the origin of

branch circuit ........................................................................................................ 50

Annex C (informative) SPD installation – Examples of installation diagrams according

to system configurations ....................................................................................................... 52

C.1 TT system – 3 phase supply plus neutral .............................................................. 52

C.2 TN-C and TN-C-S systems – 3 phase supply ........................................................ 56

C.3 TN-S system – 3 phase supply plus neutral ........................................................... 60

C.4 IT system – 3 phase supply with or without neutral ............................................... 62

Annex D (informative) Installation supplied by overhead lines .............................................. 65

Annex E (normative) Reference standards for devices for isolation and switching ................ 66

Annex F (informative) List of notes concerning certain countries .......................................... 68

Bibliography .......................................................................................................................... 75

Figure 1 – Example of installation of class I, class II and class III tested SPDs ..................... 25

Figure 2 – Connection type CT1 (4+0-configuration) for a three-phase system with

neutral .................................................................................................................................. 26

Figure 3 – Connection type CT1 (3+0-configuration) for a three-phase system ...................... 26

Figure 4 – Connection type CT2 (e.g. 3+1-configuration) for a three-phase system with

neutral .................................................................................................................................. 27

Figure 5 – Connection points of an SPD assembly ................................................................ 31

Figure 6 – Example of overcurrent protection in the SPD branch by using a dedicated

external overcurrent protective device................................................................................... 32

Figure 7 – Protective device, which is a part of the installation, also used to protect the

SPD ...................................................................................................................................... 33

Figure 8 – Connection of the SPD ......................................................................................... 35

Figure 9 – Example of installation of an SPD in order to decrease lead length of SPD

supply conductors ................................................................................................................. 36

Figure 10 – Example of selectivity ......................................................................................... 38

Figure 11 – Example of currents and their correlation to selectivity ....................................... 39

Figure 12 – Example of combined short-circuit protection of OCPDs ..................................... 40

Figure A.1 – Overload protective device (P ) not at the origin of branch circuit (B) ............... 48

Figure A.2 – Overload protective device (P ) installed within 3 m of the origin of the

branch circuit (B) .................................................................................................................. 49

Figure B.1 – Limited change of position of short-circuit protective device (P ) on a

branch circuit ........................................................................................................................ 50

Figure B.2 – Short-circuit protective device P installed at a point on the supply side

of the origin of a branch circuit .............................................................................................. 51

Figure C.1 – Example of SPDA installation with connexion type CT2 on the supply side

(upstream) of the main RCD in TT system............................................................................. 52

Figure C.2 – Example of SPD installation with connexion type CT2 on the supply side

(upstream) of the main RCD in TT system............................................................................. 53

---------------------- Page: 6 ----------------------
IEC 60364-5-53:2019 © IEC 2019 – 5 –

Figure C.3 – Example of SPDA installation on the load side (downstream) of the main

RCD in TT system ................................................................................................................. 54

Figure C.4 – Example of SPD installation on the load side (downstream) of the RCD in

TT system ............................................................................................................................. 55

Figure C.5 – Example of SPDA installation in TN-C system .................................................. 56

Figure C.6 – Example of SPD installation with connexion type CT1 in TN-C system .............. 57

Figure C.7 – Example of SPD installation in TN-C-S system where the PEN is

separated into PE and N at the origin of the installation (upstream of the SPD) .................... 58

Figure C.8 – Example of SPDs installation in TN-C-S in different distribution boards ............ 59

Figure C.9 – Example of SPDA installation in TN-S system ................................................... 60

Figure C.10 – Example of SPDs installation in TN-S ............................................................. 61

Figure C.11 – Example of SPDA installation in IT system with neutral ................................... 62

Figure C.12 – Example of SPD installation in IT system without neutral ................................ 63

Figure C.13 – Example of SPD installation in IT system with neutral ..................................... 64

Figure F.1 – Single user ........................................................................................................ 71

Figure F.2 – Several users .................................................................................................... 71

Figure F.3 – Lamp control circuit with switching in the neutral conductor .............................. 73

Table 1 – Required rated impulse voltage of equipment ........................................................ 28

Table 2 – U of the SPD dependent on supply system configuration ..................................... 29

Table 3 – Nominal discharge current (I ) in kA depending on supply system and

connection type .................................................................................................................... 30

Table 4 – Selection of impulse discharge current (I ) where the building is protected

imp

against direct lightning strike ................................................................................................ 30

Table 5 – Connection of the SPD dependent on supply system ............................................. 34

Table D.1 – Selection of impulse discharge current (I ) .................................................... 65

imp

Table E.1 – Devices for isolation and switching..................................................................... 66

---------------------- Page: 7 ----------------------
– 6 – IEC 60364-5-53:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE ELECTRICAL INSTALLATIONS –
Part 5-53: Selection and erection of electrical equipment – Devices for
protection for safety, isolation, switching, control and monitoring
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 60364 has been prepared by IEC technical committee 64:

Electrical installations and
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.