IEC 60364-5-53:2019
(Main)Low-voltage electrical installations - Part 5-53: Selection and erection of electrical equipment - Devices for protection for safety, isolation, switching, control and monitoring
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.
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IEC 60364-5-53 ®
Edition 4.0 2019-02
INTERNATIONAL
STANDARD
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
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
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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,
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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
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IEC 60364-5-53 ®
Edition 4.0 2019-02
INTERNATIONAL
STANDARD
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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.01; 91.140.50 ISBN 978-2-8322-6509-3
– 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
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
– 4 – IEC 60364-5-
...
IEC 60364-5-53 ®
Edition 4.2 2024-12
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
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Low-voltage electrical installations –
Part 5-53: Selection and erection of electrical equipment – Devices for protection
for safety, isolation, switching, control and monitoring
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
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International Standards for all electrical, electronic and related technologies.
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Edition 4.2 2024-12
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INTERNATIONAL
STANDARD
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Low-voltage electrical installations –
Part 5-53: Selection and erection of electrical equipment – Devices for protection
for safety, isolation, switching, control and monitoring
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.01, 91.140.50 ISBN 978-2-8327-0119-5
REDLINE VERSION – 2 – IEC 60364-5-53:2019+AMD1:2020
+AMD2:2024 CSV © IEC 2024
CONTENTS
FOREWORD . 7
530.1 Scope . 9
530.2 Normative references . 9
530.3 Terms and definitions . 12
530.4 General and common requirements. 15
530.5 Erection of equipment . 15
531 Devices for protection against indirect contact by automatic disconnection of
supply.
531.1 Overcurrent protective devices .
531.1.1 TN systems .
531.1.2 TT systems .
531.1.3 IT systems .
531.2 Residual current protective devices.
531.2.1 General conditions of installation .
531.2.2 Selection of devices according to their method of application .
531.2.3 TN systems .
531.2.4 TT systems .
531.2.5 IT systems .
531.3 Insulation monitoring devices .
531 Equipment for protection against electric shock . 17
531.1 General . 17
531.2 Devices for automatic disconnection of supply . 18
531.2.1 General . 18
531.2.2 Overcurrent protective devices . 18
531.2.3 Residual current protective devices . 20
531.3 Equipment for protection by double or reinforced insulation . 23
531.3.1 General . 23
531.4 Equipment for protection by electrical separation . 25
531.5 Equipment for protection by extra-low-voltage provided by SELV and PELV
systems . 25
531.5.1 Sources for SELV or PELV systems . 25
531.5.2 Selection of plugs and socket-outlets . 25
531.6 Devices for additional protection . 25
531.7 Monitoring devices . 26
532 Devices and precautions for protection against thermal effects . 26
532.1 General . 26
532.2 Locations with a particular risk of fire . 26
532.2.1 General . 26
532.2.2 Locations with external influences BD2, BD3 or BD4 . 26
532.2.3 Locations with external influences BE2 . 27
532.2.3.1 General . 27
532.2.3.2 Selection of residual current protective devices (RCD) . 27
532.2.3.3 Selection of residual current monitoring device (RCM) in IT systems . 27
532.2.3.4 Selection of insulation monitoring devices (IMDs) in IT systems . 27
532.3 Selection of arc fault detection devices (AFDD) . 27
533 Devices for protection against overcurrent . 28
533.1 General requirements . 28
+AMD2:2024 CSV © IEC 2024
533.1.1 General . 28
533.1.2 Compliance with standards . 28
533.1.2.1 General . 28
533.1.2.2 Applicability of devices . 28
533.1.3 Fuses . 29
533.2 Selection of devices for protection against overload current . 29
533.2.1 General . 29
533.2.2 Presence of harmonic currents . 30
533.2.3 Unequal current sharing between parallel conductors . 30
533.3 Selection of devices for protection against short-circuit current . 30
533.3.1 Thermal stresses . 30
533.3.1.1 Cables and insulated conductors . 30
533.3.1.2 Busbar trunking systems and powertracks . 30
533.3.2 Breaking capacity . 31
533.4 Positioning of overcurrent protection devices . 31
533.4.1 General . 31
533.4.2 Positioning of devices for overload protection . 31
533.4.3 Positioning of devices for short-circuit protection . 32
533.5 Co-ordination of overload and short-circuit protective functions. 33
533.5.1 Protective functions provided by one device . 33
533.5.2 Protective functions provided by separate devices . 33
534 Devices for protection against transient overvoltages . 33
534.1 General . 33
534.2 Void . 34
534.3 Void . 34
534.4 Selection and erection of SPDs . 34
534.4.1 SPD location and SPD test class . 34
534.4.2 Transient overvoltage protection requirements . 35
534.4.3 Connection types . 35
534.4.4 Selection of SPDs . 37
534.4.5 Protection of the SPD against overcurrent . 42
534.4.6 Fault protection . 44
534.4.7 SPDs installation in conjunction with RCDs. 45
534.4.8 Connections of the SPD . 45
534.4.9 Effective protective distance of SPDs . 47
534.4.10 Connecting conductors of SPDs . 48
535 Co-ordination of protective devices . 48
535.1 Selectivity between overcurrent protective devices . 48
535.1.1 General . 48
535.1.2 Partial selectivity . 49
535.1.3 Full selectivity . 49
535.1.4 Total selectivity . 49
535.1.5 Enhanced selectivity . 49
535.2 Co-ordination between residual current protective devices and OCPDs. 50
535.3 Selectivity between residual current protective devices . 50
535.4 Selectivity of RCD and OCPD . 50
535.5 Combined short-circuit protection of OCPDs . 50
536 Isolation and switching . 51
536.2 Isolation . 51
...
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
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
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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.
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and withdrawn publications. Also known as the International Electrotechnical Vocabulary
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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
– 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
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 .
...
IEC 60364-5-53 ®
Edition 4.1 2020-12
CONSOLIDATED VERSION
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 oeuvre des matériels électriques – Dispositifs
de protection pour assurer la sécurité, le sectionnement, la coupure,
la commande et la surveillance
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.
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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.
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IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
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need further assistance, please contact the Customer Service
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IEC 60364-5-53 ®
Edition 4.1 2020-12
CONSOLIDATED VERSION
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 oeuvre 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 978-2-8322-9201-3
IEC 60364-5-53 ®
Edition 4.1 2020-12
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
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 oeuvre des matériels électriques – Dispositifs
de protection pour assurer la sécurité, le sectionnement, la coupure,
la commande et la surveillance
– 2 – IEC 60364-5-53:2019+AMD1:2020 CSV
© IEC 2020
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.
531.1 Overcurrent protective devices .
531.1.1 TN systems .
531.1.2 TT systems .
531.1.3 IT systems .
531.2 Residual current protective devices.
531.2.1 General conditions of installation .
531.2.2 Selection of devices according to their method of application .
531.2.3 TN systems .
531.2.4 TT systems .
531.2.5 IT systems .
531.3 Insulation monitoring devices .
531 Equipment for protection against electric shock . 16
531.1 General . 16
531.2 Devices for automatic disconnection of supply . 17
531.2.1 General . 17
531.2.2 Overcurrent protective devices . 17
531.2.3 Residual current protective devices . 19
531.3 Equipment for protection by double or reinforced insulation . 22
531.4 Equipment for protection by electrical separation . 24
531.5 Equipment for protection by extra-low-voltage provided by SELV and PELV
systems . 24
531.5.1 Sources for SELV or PELV systems . 24
531.5.2 Selection of plugs and socket-outlets . 24
531.6 Devices for additional protection . 24
531.7 Monitoring devices . 25
532 Devices and precautions for protection against thermal effects . 25
532.1 General . 25
532.2 Locations with a particular risk of fire . 25
532.2.1 General . 25
532.2.2 Locations with external influences BD2, BD3 or BD4 . 25
532.2.3 Locations with external influences BE2 . 26
532.3 Selection of arc fault detection devices (AFDD) . 26
533 Devices for protection against overcurrent . 27
533.1 General requirements . 27
533.1.1 General . 27
533.1.2 Compliance with standards . 27
533.1.3 Fuses . 28
533.2 Selection of devices for protection against overload current . 28
© IEC 2020
533.2.1 General . 28
533.2.2 Presence of harmonic currents . 29
533.2.3 Unequal current sharing between parallel conductors . 29
533.3 Selection of devices for protection against short-circuit current . 29
533.3.1 Thermal stresses . 29
533.3.2 Breaking capacity . 30
533.4 Positioning of overcurrent protection devices . 30
533.4.1 General . 30
533.4.2 Positioning of devices for overload protection . 30
533.4.3 Positioning of devices for short-circuit protection . 31
533.5 Co-ordination of overload and short-circuit protective functions. 32
533.5.1 Protective functions provided by one device . 32
533.5.2 Protective functions provided by separate devices . 32
534 Devices for protection against transient overvoltages . 32
534.1 General . 32
534.2 Void . 33
534.3 Void . 33
534.4 Selection and erection of SPDs .
...
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