IEC 61204-7:2016

Low-voltage switch mode power supplies - Part 7: Safety requirements

IEC 61204-7:2016 specifies the safety requirements for switch mode power supply (SMPS) units supplied by source voltages up to 1 000 V AC or 1 500 V DC providing AC and/or DC output(s), except inverter output(s) establishing AC mains. This product standard covers both stand-alone and component SMPS as defined in this document. DC power and distribution equipment which provides, distributes, monitors, and controls isolated secondary circuit power to other equipment typically used in information and communication technology equipment installations. This edition includes the following significant technical changes with respect to the previous edition:
a) use of IEC 62477-1 as reference document, instead of IEC 60950-1;
b) modification of the title by deleting the wording "DC output-" and adding "switch mode".

Alimentations à découpage basse tension - Partie 7: Exigences de sécurité

L'IEC 61204-7:2016 spécifie les exigences de sécurité pour les alimentations à découpage (SMPS) alimentées par des sources ne dépassant pas 1 000 V en courant alternatif et 1 500 V en courant continu, fournissant un courant alternatif et/ou continu, à l'exception de la ou des sorties de l'onduleur alimentant le réseau en courant alternatif. Le présent document de produit couvre à la fois les SMPS autonomes et composants telles que définies dans le présent document. Les appareils d'alimentation et de distribution en courant continu fournissent, distribuent, surveillent et contrôlent l'alimentation isolée du circuit secondaire à d'autres appareils généralement utilisés dans les installations des équipements des technologies de l'information et de la communication. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) utilisation de l'IEC 62477-1 comme document de référence, en lieu et place de l'IEC 60950-1;
b) modification du titre avec la suppression des termes "sortie continue" et l'ajout des termes "à découpage".

General Information

• Status: Published
• Publication Date: 06-Nov-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• Technical Committee: SC 22E - Stabilized power supplies
• Drafting Committee: MT 7 - TC 22/SC 22E/MT 7
• Current Stage: PPUB - Publication issued
• Start Date: 30-Nov-2016
• Completion Date: 07-Nov-2016

Relations

• Revises: IEC 61204-7:2006 - Low-voltage power supplies, d.c. output - Part 7: Safety requirements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61204-7 ®
Edition 2.0 2016-11
EXTENDED VERSION
colour
inside
This Extended version of IEC 61204-7:2016 includes the provisions of the general rules of
IEC 62477-1:2012
Low-voltage switch mode power supplies –
Part 7: Safety requirements
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.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
IEC 61204-7 ®
Edition 2.0 2016-11
EXTENDED VERSION
colour
inside
This Extended version of IEC 61204-7:2016 includes the provisions of the general rules of

IEC 62477-1:2012
Low-voltage switch mode power supplies –

Part 7: Safety requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200 ISBN 978-2-8322-3751-9

– 2 – IEC 61204-7:2016 EXV  IEC 2016
CONTENTS
FOREWORD . 9
INTRODUCTION . 12
0 Principles of safety . 13
0.1 General . 13
0.2 Hazards . 14
0.2.1 General . 14
0.2.2 Electric shock . 14
0.2.3 Energy related hazards . 15
0.2.4 Fire . 15
0.2.5 Heat related hazards . 16
0.2.6 Mechanical hazards . 16
0.2.7 Chemical hazards . 16
0.3 Materials and components . 16
1 Scope . 17
1.1 Equipment covered by this document . 17
1.2 Exclusions . 17
1.3 Additional requirements . 18
2 Normative references . 18
3 Terms and definitions . 19
4 Protection against hazards . 29
4.1 General . 29
4.1.100 Constructions not specifically covered . 30
4.1.101 Orientation during transport and use . 30
4.2 Fault and abnormal conditions . 30
4.2.100 Application of faults and abnormal conditions . 31
4.3 Short circuit and overload protection . 32
4.3.1 General . 32
4.3.2 Specification of input short-circuit withstand strength and output short
circuit current ability . 33
4.3.3 Short-circuit coordination (backup protection) . 34
4.3.4 Protection by several devices . 34
4.4 Protection against electric shock . 34
4.4.1 General . 34
4.4.2 Decisive voltage class . 34
4.4.3 Provision for basic protection . 37
4.4.4 Provision for fault protection . 38
4.4.5 Enhanced protection . 44
4.4.6 Protective measures . 47
4.4.7 Insulation . 49
4.4.8 Compatibility with residual current-operated protective devices (RCD) . 67
4.4.9 Capacitor discharge . 67
4.5 Protection against electrical energy hazards . 68
4.5.1 Operator access areas. 68
4.5.2 Service access areas . 69
4.6 Protection against fire and thermal hazards . 69
4.6.1 Circuits representing a fire hazard . 69

4.6.2 Components representing a fire hazard . 69
4.6.3 Fire enclosures . 70
4.6.4 Temperature limits . 74
4.6.5 Limited power sources . 78
4.7 Protection against mechanical hazards . 79
4.7.1 General . 79
4.7.2 Specific requirements for liquid cooled SMPS . 79
4.8 Equipment with multiple sources of supply . 81
4.9 Protection against environmental stresses . 81
4.10 Protection against sonic pressure hazards . 82
4.10.1 General . 82
4.10.2 Sonic pressure and sound level . 82
4.11 Wiring and connections . 83
4.11.1 General . 83
4.11.2 Routing . 83
4.11.3 Colour coding . 83
4.11.4 Splices and connections . 83
4.11.5 Accessible connections . 84
4.11.6 Interconnections between parts of the SMPS . 84
4.11.7 Supply connections. 84
4.11.8 Terminals . 84
4.12 Enclosures . 86
4.12.1 General . 86
4.12.2 Handles and manual controls . 86
4.12.3 Cast metal . 87
4.12.4 Sheet metal . 87
4.12.5 Stability test for enclosure . 90
5 Test requirements . 91
5.1 General . 91
5.1.1 Test objectives and classification . 91
5.1.2 Selection of test samples . 91
5.1.3 Sequence of tests . 91
5.1.4 Earthing conditions . 91
5.1.5 General conditions for tests . 91
5.1.6 Compliance . 93
5.1.7 Test overview . 93
5.2 Test specifications . 95
5.2.1 Visual inspections (type test, sample test and routine test) . 95
5.2.2 Mechanical tests . 96
5.2.3 Electrical tests . 100
5.2.4 Abnormal operation and simulated faults tests . 119
5.2.5 Material tests . 127
5.2.6 Environmental tests (type tests) . 130
5.2.7 Hydrostatic pressure test (type test and routine test) . 135
6 Information and marking requirements . 135
6.1 General . 135
6.2 Information for selection . 137
6.2.100 Additional marking requirem
...

IEC 61204-7 ®
Edition 2.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switch mode power supplies –
Part 7: Safety requirements
Alimentations à découpage basse tension –
Partie 7: Exigences de sécurité

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.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and

CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
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.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient 20 000 termes et définitions en anglais
Spécifications techniques, Rapports techniques et autres
et en français, ainsi que les termes équivalents dans 15
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.

Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
65 000 entrées terminologiques électrotechniques, en anglais
La recherche avancée permet de trouver des publications IEC
en utilisant différents critères (numéro de référence, texte, et en français, extraites des articles Termes et Définitions des
comité d’études,…). Elle donne aussi des informations sur les publications IEC parues depuis 2002. Plus certaines entrées
projets et les publications remplacées ou retirées. antérieures extraites des publications des CE 37, 77, 86 et

CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 61204-7 ®
Edition 2.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switch mode power supplies –

Part 7: Safety requirements
Alimentations à découpage basse tension –

Partie 7: Exigences de sécurité

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-3670-3

– 2 – IEC 61204-7:2016  IEC 2016
CONTENTS
FOREWORD . 7
INTRODUCTION . 10
0 Principles of safety . 11
0.1 General . 11
0.2 Hazards . 12
0.2.1 General . 12
0.2.2 Electric shock . 12
0.2.3 Energy related hazards . 13
0.2.4 Fire . 13
0.2.5 Heat related hazards . 14
0.2.6 Mechanical hazards . 14
0.2.7 Chemical hazards . 14
0.3 Materials and components . 14
1 Scope . 15
1.1 Equipment covered by this document . 15
1.2 Exclusions . 15
1.3 Additional requirements . 15
2 Normative references . 16
3 Terms and definitions . 17
3.100 General . 18
4 Protection against hazards . 20
4.1 General . 20
4.1.100 Constructions not specifically covered . 21
4.1.101 Orientation during transport and use . 21
4.2 Fault and abnormal conditions . 21
4.2.100 Application of faults and abnormal conditions . 22
4.3 Short circuit and overload protection . 22
4.4 Protection against electric shock . 23
4.4.1 General . 23
4.4.2 Decisive voltage class . 23
4.4.3 Provision for basic protection . 25
4.4.4 Provision for fault protection . 26
4.4.5 Enhanced protection . 27
4.4.6 Protective measures . 30
4.4.7 Insulation . 31
4.4.8 Compatibility with residual current-operated protective devices (RCD) . 37
4.4.9 Capacitor discharge . 37
4.5 Protection against electrical energy hazards . 38
4.5.1 Operator access areas. 38
4.5.2 Service access areas . 38
4.6 Protection against fire and thermal hazards . 38
4.6.1 Circuits representing a fire hazard . 38
4.6.2 Components representing a fire hazard . 38
4.6.3 Fire enclosures . 38
4.6.4 Temperature limits . 40
4.6.5 Limited power sources . 41

4.7 Protection against mechanical hazards . 41
4.7.1 General . 41
4.7.2 Specific requirements for liquid cooled SMPS . 41
4.8 Equipment with multiple sources of supply . 41
4.9 Protection against environmental stresses . 41
4.10 Protection against sonic pressure hazards . 41
4.11 Wiring and connections . 41
4.11.1 General . 41
4.11.2 Routing . 41
4.11.3 Colour coding . 41
4.11.4 Splices and connections . 41
4.11.5 Accessible connections . 41
4.11.6 Interconnections between parts of the SMPS . 42
4.11.7 Supply connections. 42
4.11.8 Terminals . 42
4.12 Enclosures . 42
4.12.1 General . 42
4.12.2 Handles and manual controls . 42
4.12.3 Cast metal . 43
4.12.4 Sheet metal . 43
4.12.5 Stability test for enclosure . 43
5 Test requirements . 43
5.1 General .
...