EN IEC 61204-7:2018

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

IEC 61204-7:2016 is available as IEC 61204-7:2016 EXV which includes the provisions of the general rules dealt with in IEC 62477-1:2012. 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".

Stromversorgungsgeräte für Niederspannung mit Gleichstromausgang - Teil 7: Sicherheitsanforderungen

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".

Nizkonapetostni stikalni napajalniki - 7. del: Varnostne zahteve (IEC 61204-7:2016)

Ta del standarda IEC 61204 določa varnostne zahteve za stikalne napajalnike (SMPS), napajane z največ 1000 V izvorne izmenične napetosti ali 1500 V enosmerne napetosti, ki zagotavljajo izmenični in/ali enosmerni izhod, razen izhod inverterja, ki zagotavlja izmenično napajanje (glej izjeme v točki 1.2).
OPOMBA 1: Ta dokument zajema pretvornike enosmernega v enosmerni tok.
OPOMBA 2: Napajalniki lahko zagotavljajo dodatne vtičnice z izmeničnim napajanjem, če so te napajane z izmenično napetostjo.
Ta standard za proizvode zajema tako samostojne kot komponentne stikalne napajalnike (SMPS), kot je določeno v tem dokumentu. Oprema za distribucijo in napajanje z enosmernim tokom, ki zagotavlja, distribuira, nadzoruje in upravlja dovajanje toka izoliranega sekundarnega tokokroga v drugo opremo, ki je običajno uporabljena za namestitev opreme informacijsko-komunikacijske tehnologije (glej dodatek AC).
Oprema v sklopu dodatka AC vključuje posamezne ali vse spodnje postavke:
– distribucijske plošče, električne plošče, prekinjevalniki in naprave za nadtokovno zaščito;
– krmilna in kontrolna oprema;
– sestavi iz stojal, polic in ohišij, ki bi lahko vsebovali katero koli od zgoraj naštetih komponent, medsebojno povezana strojna oprema, napajalniki (kot so razsmerniki,
pretvorniki in inverterji), baterije in druge povezane periferne naprave.
Če ustrezni standard ne obstaja, je mogoče ta dokument uporabiti tudi za druge potrebe.

General Information

• Status: Published
• Publication Date: 15-Mar-2018
• Withdrawal Date: 15-Mar-2021
• ICS: 29.200 - Rectifiers. Convertors. Stabilized power supply
• Technical Committee: CLC/TC 22X - Power electronics
• Drafting Committee: IEC/SC 22E - IEC_SC_22E
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 16-Mar-2018
• Completion Date: 16-Mar-2018
• Directive: 2006/95/EC - Directive 2006/95/EC of the European Parliament and of the Council of 12 December 2006 on the harmonisation of the laws of Member States relating to electrical equipment designed for use within certain voltage limits (codified version)
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: SIST EN IEC 61204-7:2018 - Low-voltage switch mode power supplies - Part 7: Safety requirements (IEC 61204-7:2016)

Relations

• Replaces: EN 61204-7:2006/A11:2009 - Low voltage power supplies, d.c. output - Part 7: Safety requirements
• Effective Date: 07-Jun-2022
• Replaces: EN 61204-7:2006 - Low voltage power supplies, d.c. output - Part 7: Safety requirements
• Effective Date: 20-Mar-2018

Overview

EN IEC 61204-7:2018 (IEC 61204-7:2016) specifies safety requirements for low-voltage switch mode power supplies (SMPS) and related DC power/distribution equipment. The standard applies to SMPS units fed from source voltages up to 1 000 V AC or 1 500 V DC, providing AC and/or DC outputs. It covers both stand‑alone and component SMPS used to supply isolated secondary circuits (for example in information and communication technology installations), but excludes inverter outputs that establish AC mains.

This edition adopts IEC 62477-1 as the general reference (replacing IEC 60950‑1) and updates the title to emphasize “switch mode” devices.

Key topics and technical requirements

The standard focuses on practical safety measures and testable requirements. Major technical topics include:

• Protection against electric shock - requirements for basic and fault protection, insulation, decisive voltage classification and compatibility with protective devices.
• Fault and abnormal condition management - guidance on applying faults and evaluating abnormal operating conditions.
• Short-circuit and overload protection - criteria for current-limiting, fusing and safe disruption of hazardous currents.
• Protection against fire and thermal hazards - component and enclosure fire risk, temperature limits and fire‑enclosure requirements.
• Energy-related and mechanical hazards - addressing stored energy, hot surfaces, and mechanical risks.
• Materials and components - requirements for suitable materials, capacitors and other parts that affect safety.
• Service and operator access - delineation of operator vs service areas and the protections required for each.
• Normative references and harmonization with other IEC/CENELEC documents (detailed normative list in Annex ZA).

Practical applications - who uses this standard

SIST EN IEC 61204-7 is essential for:

• SMPS manufacturers designing products to meet international safety requirements.
• Product safety engineers and design teams validating insulation, creepage, workforce exposure and thermal design.
• Test laboratories and certification bodies performing safety assessments and compliance testing.
• Compliance officers and CE marking applicants seeking presumption of conformity with the EU Low Voltage Directive (2014/35/EU) when the standard is cited in the Official Journal.
• Procurement and system integrators specifying safe power supplies for ICT racks, industrial control, telecom and DC distribution systems.

Related standards

Relevant cross‑references and harmonized documents include, among others:

• IEC 62477-1 (Safety requirements for power electronic converter systems) - now the primary reference.
• IEC 62368-1, IEC 61558 series and multiple IEC component standards cited in Annex ZA.

Keywords: Low-voltage switch mode power supplies, SMPS safety requirements, IEC 61204-7, EN IEC 61204-7:2018, SMPS compliance, Low Voltage Directive, product safety.

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61204-7:2018
01-junij-2018
1DGRPHãþD
SIST EN 61204-7:2007
SIST EN 61204-7:2007/A11:2009
Nizkonapetostni stikalni napajalniki - 7. del: Varnostne zahteve (IEC 61204-7:2016)
Low-voltage switch mode power supplies - Part 7: Safety requirements (IEC 61204-
7:2016)
Stromversorgungsgeräte für Niederspannung mit Gleichstromausgang - Teil 7:
Sicherheitsanforderungen (IEC 61204-7:2016)
Alimentations à découpage basse tension - Partie 7: Exigences de sécurité (IEC 61204-
7:2016)
Ta slovenski standard je istoveten z: EN IEC 61204-7:2018
ICS:
29.200 8VPHUQLNL3UHWYRUQLNL Rectifiers. Convertors.
6WDELOL]LUDQRHOHNWULþQR Stabilized power supply
QDSDMDQMH
SIST EN 61204-7:2018 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

SIST EN 61204-7:2018
SIST EN 61204-7:2018
EUROPEAN STANDARD EN IEC 61204-7

NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 29.200 Supersedes EN 61204-7:2006
English Version
Low-voltage switch mode power supplies - Part 7: Safety
requirements
(IEC 61204-7:2016)
Alimentations à découpage basse tension - Partie 7: Stromversorgungsgeräte für Niederspannung mit
Exigences de sécurité Gleichstromausgang - Teil 7: Sicherheitsanforderungen
(IEC 61204-7:2016) (IEC 61204-7:2016)
This European Standard was approved by CENELEC on 2016-12-12. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61204-7:2018 E
SIST EN 61204-7:2018
European foreword
The text of document 22E/175/FDIS, future edition 2 of IEC 61204-7, prepared by IEC/SC 22E
"Stabilized power supplies" of IEC/TC 22 "Power electronic systems and equipment" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61204-7:2018.
The following dates are fixed:
(dop) 2018-09-16
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2021-03-16
• latest date by which the national standards conflicting with
the document have to be withdrawn
This document supersedes EN 61204-7:2006.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive 2014/35/EU, see informative Annex ZZ, which is an integral part
of this document.
Endorsement notice
The text of the International Standard IEC 61204-7:2016 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 60085 NOTE Harmonized in EN 60085.
IEC 61140 NOTE Harmonized in EN 61140.
IEC 60127 series NOTE Harmonized in EN 60127 series.
IEC 60146-1-1 NOTE Harmonized in EN 60146-1-1.
IEC 60317-43 NOTE Harmonized in EN 60317-43.
IEC 60364-4-41 NOTE Harmonized in HD 60364-4-41.
IEC 60747-5-1 NOTE Harmonized in EN 60747-5-1.
IEC 60747-5-2 NOTE Harmonized in EN 60747-5-2.
SIST EN 61204-7:2018
IEC 60950-1:2005 NOTE Harmonized in EN 60950-1:2006 (modified).
A1:2009 A1:2010 (modified)
A2:2013 A2:2013 (modified)
IEC 61032:1997 NOTE Harmonized in EN 61032:1998.
IEC 61180 series NOTE Harmonized in EN 61180 series.
IEC 61347-2-2 NOTE Harmonized in EN 61347-2-2.
IEC 61349-1:2011 NOTE Harmonized in EN 61349-1:2011.
IEC 61508 series NOTE Harmonized in EN 61508 series.
IEC 61558 series NOTE Harmonized in EN 61558 series.
IEC 61643-21 NOTE Harmonized in EN 61643-21.
IEC 61643-311 NOTE Harmonized in EN 61643-311.
IEC 61643-321 NOTE Harmonized in EN 61643-321.
IEC 61643-331 NOTE Harmonized in EN 61643-331.
IEC 62386 series NOTE Harmonized in EN 62386 series.
SIST EN 61204-7:2018
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 60227 series Polyvinyl chloride insulated cables of rated - series
voltages up to and including 450/750 V --
Part 1: General requirements
IEC 60245 series Rubber insulated cables - Rated voltages - series
up to and including 450/750 V -- Part 1:
General requirements
IEC 60320 series Appliance couplers for household and EN 60320 series
similar general purposes - Part 1: General
requirements
IEC 60384-14 2013 Fixed capacitors for use in electronic EN 60384-14 2013
equipment -- Part 14: Sectional
specification - Fixed capacitors for
electromagnetic interference suppression
and connection to the supply mains
IEC 60417 2002 Graphical symbols for use on equipment - -
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
- -  + corrigendum May 1993
IEC 60529 AMD 1 1999 Degrees of protection provided by - -
enclosures (IP_code); Amendment_1
IEC 60529 AMD 2 2013 Degrees of protection provided by - -
enclosures (IP_code); Amendment_2
IEC 60695-11-5 -  Fire hazard testing - Part 11-5: Test flames EN 60695-11-5 2017
- Needle-flame test method - Apparatus,
confirmatory test arrangement and
guidance
IEC 60695-11-20 1999 Fire hazard testing_- Part_11-20: Test - -
flames_- 500_W flame test methods
IEC 60730-1 2010 Automatic electrical controls for household EN 60730-1 2011
and similar use -- Part 1: General (mod)
requirements
SIST EN 61204-7:2018
IEC 60738-1 2006 Thermistors - Directly heated positive EN 60738-1 2006
temperature coefficient -- Part 1: Generic
specification
IEC 60747-5-5 2007 Semiconductor devices - Discrete devices -EN 60747-5-5 2011
- Part 5-5: Optoelectronic devices -
Photocouplers
IEC 60799 -  Electrical accessories - Cord sets and EN 60799 1998
interconnection cord sets
IEC 60851-3 2009 Winding wires - Test methods -- Part 3: EN 60851-3 2009
Mechanical properties
IEC 60851-5 2008 Winding wires - Test methods -- Part 5: EN 60851-5 2008
Electrical properties
IEC 60851-6 1996 Winding wires - Test methods -- Part 6: - -
Thermal properties
IEC 60947-1 -  Low-voltage switchgear and controlgear -- EN 60947-1 2007
Part 1: General rules
IEC 60947-3 -  Low-voltage switchgear and controlgear -- EN 60947-3 2009
Part 3: Switches, disconnectors, switch- +A1 2012
disconnectors and fuse-combination units +A2 2015
IEC 60990 1999 Methods of measurement of touch current EN 60990 1999
and protective conductor current
IEC 61010-1 2010 Safety requirements for electrical EN 61010-1 2010
equipment for measurement, control and
laboratory use -- Part 1: General
requirements
IEC 61058-1 2000 Switches for appliances -- Part 1: General - -
requirements
+ A1 2001  EN 61058-1 2002
+ A2 2007  + A2 2008
+ corrigendum Jan. 2009  - -
IEC 61293 1994 Marking of electrical equipment with ratings EN 61293 1994
related to electrical supply - Safety
requirements
IEC 61558-1 2005 Safety of power transformers, power EN 61558-1 2005
supplies, reactors and similar products --
Part 1: General requirements and tests
- -  + corrigendum Aug. 2006
+ A1 2009 + A1 2009
IEC 61558-2 series Safety of power transformers, power EN 61558-2 series
supplies, reactors and similar products --
Part 2-1: Particular requirements and tests
for separating transformers and power
supplies incorporating separating
transformers for general applications
IEC 61810-1 2008 Electromechanical elementary relays -- EN 61810-1 2008
Part 1: General requirements
SIST EN 61204-7:2018
IEC 62368-1 2014 Audio/video, information and EN 62368-1 2014
communication technology equipment -- (mod)
Part 1: Safety requirements
- -  + AC 2015
- -  + A11 2017
- -  + AC 2017-03
IEC 62477-1 2012 Safety requirements for power electronic EN 62477-1 2012
converter systems and equipment -- Part 1:
General
- -  + A11 2014
SIST EN 61204-7:2018
Annex ZZ
(informative)
Relationship between this European Standard and the safety objectives of
Directive 2014/35/EU [2014 OJ L96] aimed to be covered
This European Standard has been prepared under a Commission’s standardization request relating to
harmonized standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means
of conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the
Council of 26 February 2014 on the harmonization of the laws of the Member States relating to the
making available on the market of electrical equipment designed for use within certain voltage limits
[2014 OJ L96].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZZ.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding safety objectives of
that Directive, and associated EFTA regulations.
Table ZZ.1 – Correspondence between this European Standard
and Annex I of Directive 2014/35/EU [2014 OJ L96]
Safety objectives of Clause(s) / sub-clause(s) Remarks / Notes
Directive 2014/35/EU of this EN
(1)(a) 6
(1)(b) 6
Annex AC 5
(1)(c) Refer to 2a) to 2d) and 3a) to
3c) in this table.
Refer to standard clause 1, 6
Annex AC 5
(2)(a) 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, Hazards arising from electric,
4.8, 4.11, 4.12, 5.2, Annex A, magnetic, and electromagnetic

Annex D, Annex F, Annex AA, fields, other ionizing and non-

Annex AC ionizing radiation are covered in

separate standards.
(2)(b)
4.3, 4.4, 4.6, 4.10, 4.11, 4.12,

Annex AC
(2)(c)
4.7, 4.9, 4.11, 4.12, 5.2
(2)(d)
4.1 4.2, 4.11, 4.12, 5.2, Annex
D, Annex F, Annex AA, Annex
AC
(3)(a) 4.7, 4.9, 4.12, 5.2 Hazards arising from electric,
magnetic, and electromagnetic
fields, other ionizing and non-
(3)(b) 4.2, 4.9, 5.2
ionizing radiation are covered in

separate standards.
(3)(c) 4.1, 4.2, 4.3, 5.2, Annex AA,
Hazards arising from
Annex AC
unattended operation have
been duly considered.
SIST EN 61204-7:2018
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
SIST EN 61204-7:2018
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

SIST EN 61204-7:2018
– 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

SIST EN 61204-7:2018
IEC 61204-7:2016  IEC 2016 – 3 –
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 . 43
5.1.1 Test objectives and classification . 43
5.1.2 Selection of test samples . 43
5.1.3 Sequence of tests . 43
5.1.4 Earthing conditions . 43
5.1.5 General conditions for tests . 43
5.1.6 Compliance . 44
5.1.7 Test overview . 44
5.2 Test specifications . 46
5.2.1 Visual inspections (type test, sample test and routine test) . 46
5.2.2 Mechanical tests . 46
5.2.3 Electrical tests . 48
5.2.4 Abnormal operation and simulated faults tests . 56
5.2.5 Material tests . 61
5.2.6 Environmental tests (type tests) . 61
5.2.7 Hydrostatic pressure test (type test and routine test) . 62
6 Information and marking requirements . 62
6.1 General . 62
6.2 Information for selection . 64
6.2.100 Additional marking requirements for SMPS . 64
6.2.101 Additional information for Component SMPS . 66
6.3 Information for installation and commissioning . 66
6.3.1 General . 66
6.3.2 Mechanical considerations . 66
6.3.3 Environment . 66
6.3.4 Handling and mounting . 66
6.3.5 Enclosure temperature. 66

SIST EN 61204-7:2018
– 4 – IEC 61204-7:2016  IEC 2016
6.3.6 Connections . 66
6.3.7 Protection requirements . 67
6.3.8 Commissioning . 69
6.4 Information for use . 69
6.4.1 General . 69
6.4.2 Adjustment . 69
6.4.3 Labels, signs and signals . 69
6.5 Information for maintenance . 69
6.5.1 General . 69
6.5.2 Capacitor discharge . 69
6.5.3 Auto restart/bypass connection . 69
6.5.4 Other hazards . 69
6.5.5 Equipment with multiple sources of supply . 69
6.5.100 Disconnect device external to permanently connected equipment . 70
6.5.101 Power cord acting as disconnecting device . 70
7 Components . 70
7.1 General . 70
7.2 Switches . 71
7.2.1 General . 71
7.2.2 Requirements for switches acting as disconnecting device . 71
7.2.3 Requirements for switches . 72
7.2.4 Test method and compliance criteria . 73
7.3 Overtemperature protection devices (thermal cut-offs or thermal links) . 73
7.4 PTC thermistors . 74
7.5 Overcurrent protective devices . 74
7.6 Protective devices not mentioned in 7.2 to 7.5 . 74
7.6.1 Other protective devices requirements . 74
7.6.2 Compliance and test method. 74
7.7 Transformers . 74
7.7.1 General . 74
7.7.2 Insulation . 75
7.8 Motors . 76
7.9 Mains supply cords . 76
7.9.1 General . 76
7.9.2 Fitting of non-detachable mains supply cords . 77
7.10 Surge Protective Devices (SPDs) . 79
7.10.1 Use of an SPD connected to reliable earthing . 79
7.10.2 Use of an SPD between mains and protective earth . 79
7.10.3 Bridging of supplementary, double or reinforced insulation by a SPD . 79
7.10.4 Circuits or components used as transient voltage limiting devices . 79
7.11 Wound components . 80
7.12 IC current limiters . 80
7.12.1 General . 80
7.12.2 Test program 1 . 81
7.12.3 Test program 2 . 81
7.12.4 Test program 3 . 81
7.13 Capacitors and RC units bridging insulation . 82
7.14 Optocouplers bridging insulation . 84
7.15 Relays . 84

SIST EN 61204-7:2018
IEC 61204-7:2016  IEC 2016 – 5 –
7.16 Electrolytic capacitors . 85
Annex A (normative) Additional information for protection against electric shock . 86
Annex B (informative) Considerations for the reduction of the pollution degree . 88
Annex C (informative) Symbols referred to in IEC 62477-1 . 89
Annex D (normative) Evaluation of clearance and creepage distances . 90
Annex E (informative) Altitude correction for clearances . 91
Annex F (normative) Clearance and creepage distance determination for frequencies
greater than 30 kHz . 92
Annex G (informative) Cross-sections of round conductors . 93
Annex H (informative) Guidelines for RCD compatibility . 94
Annex I (informative) Examples of overvoltage category reduction . 95
Annex J (informative) Burn thresholds for touchable surfaces . 96
Annex K (informative) Table of electrochemical potentials . 97
Annex L (informative) Measuring instrument for touch current measurements . 98
Annex M (informative) Test probes for determining access . 99
Annex AA (normative) Addition Insulated winding wires for use without interleaved
insulation . 100
Annex AB (informative) Minimum and maximum cross-section of copper conductors
suitable for connection to terminals for external conductors . 103
Annex AC (normative) DC power and distribution equipment . 104
Annex AD (informative) Addition Examples of protective measures according to
IEC 61204-7 clause 4.4.1 – 4.4.5 for protection against electrical shock . 119
Bibliography . 121

Figure 100 – Electric strength test instrument . 53
Figure 101 – Mandrel . 54
Figure 102 – Initial position of mandrel . 55
Figure 103 – Final position of mandrel . 55
Figure 104 – Position of metal foil on insulating material . 55
Figure 105 – Determination of arithmetic average temperature . 60
Figure 106 – Detachable mains supply cords and connections . 77
Figure AC.100 – Resistance and short circuit calculations . 107

Table 5 – Voltage limits . 24
Table 6 – Separation requirements for circuit under consideration . 25
Table 100 – Limits for access of current . 29
Table 101 – Tests for insulation in non-separable layers . 36
Table 22 – Test overview . 45
Table 102 – Temperature limits for transformer windings . 60
Table 36 – Information requirements . 63
Table 103 – Component requirements . 71
Table 104 – Peak surge current . 73
Table 105 – Strain relief test force . 78
Table 106 – Capacitor ratings according to IEC 60384-14 . 83

SIST EN 61204-7:2018
– 6 – IEC 61204-7:2016  IEC 2016
Table C.100 – Symbols . 89
Table AA.1 – Mandrel diameter . 101
Table AA.2 – Oven temperature . 101
Table AB.1 – Cross-section of copper conductors suitable for connection to terminals
for external conductors (extract from IEC 61439-1) . 103
Table AC.101 – AC and DC field wiring spacings . 111
Table AC.102 – Minimum acceptable spacings for uninsulated bus bars . 112
Table AC.103 – Temperature limits . 113
Table AC.104 – Switch test sequences . 115

SIST EN 61204-7:2018
IEC 61204-7:2016  IEC 2016 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCH MODE POWER SUPPLIES –

Part 7: Safety requirements
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 61204-7 has been prepared by subcommittee 22E: Stabilized
power supplies, of IEC technical committee 22: Power electronic systems and equipment.
This second edition cancels and replaces the first edition published in 2006. This edition
constitutes a complete technical revision.
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”.
IEC 61204-7 has the status of a product standard.

SIST EN 61204-7:2018
– 8 – IEC 61204-7:2016  IEC 2016
The text of this document is based on the following documents:
FDIS Report on voting
22E/175/FDIS 22E/177/RVD
Full information on the voting for the approval of this document can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61204 series, published under the general title Low-voltage power
supplies, d.c. output, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
This International Standard is to be read in conjunction with IEC 62477-1:2012.
NOTE A consolidated version is under consideration.
The provisions of the general rules dealt with in IEC 62477-1:2012 are only applicable to this
document insofar as they are specifically cited. Clauses and subclauses of IEC 62477-1:2012
that are applicable in this document are identified by reference to the reference document, for
example, 4.3 of IEC 62477-1:2012.
Subclauses that are numbered starting from 100 are additional to those in IEC 62477-1:2012.
Additional tables and figures in this document are numbered starting from 100.
New annexes in this document are lettered AA, AB, AC, etc.
Wherever the word PECS (power electronic converter system) occurs in this reference
document, this means SMPS.
The wordings SMPS and "power supply" are considered to be identical throughout this
document.
References of the reference document to clauses or tables, which have been modified in this
document, shall be read as reference to the relevant clauses or tables of this document.
Refer to 3.100 for further information on how to read this document.
In this document, the following print types are used:
– Requirements proper and normative annexes: in roman type.
– Notes and other informative matter: in smaller roman type.
– Normative conditions within tables: in smaller roman type.
– Terms that are defined in clause 3 or IEC 62477-1:2012: Bold Italic.

SIST EN 61204-7:2018
IEC 61204-7:2016  IEC 2016 – 9 –
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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 document using a
colour printer.
SIST EN 61204-7:2018
– 10 – IEC 61204-7:2016  IEC 2016
INTRODUCTION
I
...

SLOVENSKI STANDARD
01-junij-2018
Nadomešča:
SIST EN 61204-7:2007
SIST EN 61204-7:2007/A11:2009
Nizkonapetostni stikalni napajalniki - 7. del: Varnostne zahteve (IEC 61204-7:2016)
Low-voltage switch mode power supplies - Part 7: Safety requirements (IEC 61204-
7:2016)
Stromversorgungsgeräte für Niederspannung mit Gleichstromausgang - Teil 7:
Sicherheitsanforderungen (IEC 61204-7:2016)
Alimentations à découpage basse tension - Partie 7: Exigences de sécurité (IEC 61204-
7:2016)
Ta slovenski standard je istoveten z: EN IEC 61204-7:2018
ICS:
29.200 Usmerniki. Pretvorniki. Rectifiers. Convertors.
Stabilizirano električno Stabilized power supply
napajanje
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61204-7

NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2018
ICS 29.200 Supersedes EN 61204-7:2006
English Version
Low-voltage switch mode power supplies - Part 7: Safety
requirements
(IEC 61204-7:2016)
Alimentations à découpage basse tension - Partie 7: Stromversorgungsgeräte für Niederspannung mit
Exigences de sécurité Gleichstromausgang - Teil 7: Sicherheitsanforderungen
(IEC 61204-7:2016) (IEC 61204-7:2016)
This European Standard was approved by CENELEC on 2016-12-12. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 61204-7:2018 E
European foreword
The text of document 22E/175/FDIS, future edition 2 of IEC 61204-7, prepared by IEC/SC 22E
"Stabilized power supplies" of IEC/TC 22 "Power electronic systems and equipment" was submitted to
the IEC-CENELEC parallel vote and approved by CENELEC as EN IEC 61204-7:2018.
The following dates are fixed:
(dop) 2018-09-16
• latest date by which the document has to be implemented at
national level by publication of an identical national
standard or by endorsement
(dow) 2021-03-16
• latest date by which the national standards conflicting with
the document have to be withdrawn
This document supersedes EN 61204-7:2006.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
This document has been prepared under a mandate given to CENELEC by the European Commission
and the European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive 2014/35/EU, see informative Annex ZZ, which is an integral part
of this document.
Endorsement notice
The text of the International Standard IEC 61204-7:2016 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 60085 NOTE Harmonized in EN 60085.
IEC 61140 NOTE Harmonized in EN 61140.
IEC 60127 series NOTE Harmonized in EN 60127 series.
IEC 60146-1-1 NOTE Harmonized in EN 60146-1-1.
IEC 60317-43 NOTE Harmonized in EN 60317-43.
IEC 60364-4-41 NOTE Harmonized in HD 60364-4-41.
IEC 60747-5-1 NOTE Harmonized in EN 60747-5-1.
IEC 60747-5-2 NOTE Harmonized in EN 60747-5-2.
IEC 60950-1:2005 NOTE Harmonized in EN 60950-1:2006 (modified).
A1:2009 A1:2010 (modified)
A2:2013 A2:2013 (modified)
IEC 61032:1997 NOTE Harmonized in EN 61032:1998.
IEC 61180 series NOTE Harmonized in EN 61180 series.
IEC 61347-2-2 NOTE Harmonized in EN 61347-2-2.
IEC 61349-1:2011 NOTE Harmonized in EN 61349-1:2011.
IEC 61508 series NOTE Harmonized in EN 61508 series.
IEC 61558 series NOTE Harmonized in EN 61558 series.
IEC 61643-21 NOTE Harmonized in EN 61643-21.
IEC 61643-311 NOTE Harmonized in EN 61643-311.
IEC 61643-321 NOTE Harmonized in EN 61643-321.
IEC 61643-331 NOTE Harmonized in EN 61643-331.
IEC 62386 series NOTE Harmonized in EN 62386 series.
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 60227 series Polyvinyl chloride insulated cables of rated - series
voltages up to and including 450/750 V --
Part 1: General requirements
IEC 60245 series Rubber insulated cables - Rated voltages - series
up to and including 450/750 V -- Part 1:
General requirements
IEC 60320 series Appliance couplers for household and EN 60320 series
similar general purposes - Part 1: General
requirements
IEC 60384-14 2013 Fixed capacitors for use in electronic EN 60384-14 2013
equipment -- Part 14: Sectional
specification - Fixed capacitors for
electromagnetic interference suppression
and connection to the supply mains
IEC 60417 2002 Graphical symbols for use on equipment - -
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code)
- -  + corrigendum May 1993
IEC 60529 AMD 1 1999 Degrees of protection provided by - -
enclosures (IP_code); Amendment_1
IEC 60529 AMD 2 2013 Degrees of protection provided by - -
enclosures (IP_code); Amendment_2
IEC 60695-11-5 -  Fire hazard testing - Part 11-5: Test flames EN 60695-11-5 2017
- Needle-flame test method - Apparatus,
confirmatory test arrangement and
guidance
IEC 60695-11-20 1999 Fire hazard testing_- Part_11-20: Test - -
flames_- 500_W flame test methods
IEC 60730-1 2010 Automatic electrical controls for household EN 60730-1 2011
and similar use -- Part 1: General (mod)
requirements
IEC 60738-1 2006 Thermistors - Directly heated positive EN 60738-1 2006
temperature coefficient -- Part 1: Generic
specification
IEC 60747-5-5 2007 Semiconductor devices - Discrete devices -EN 60747-5-5 2011
- Part 5-5: Optoelectronic devices -
Photocouplers
IEC 60799 -  Electrical accessories - Cord sets and EN 60799 1998
interconnection cord sets
IEC 60851-3 2009 Winding wires - Test methods -- Part 3: EN 60851-3 2009
Mechanical properties
IEC 60851-5 2008 Winding wires - Test methods -- Part 5: EN 60851-5 2008
Electrical properties
IEC 60851-6 1996 Winding wires - Test methods -- Part 6: - -
Thermal properties
IEC 60947-1 -  Low-voltage switchgear and controlgear -- EN 60947-1 2007
Part 1: General rules
IEC 60947-3 -  Low-voltage switchgear and controlgear -- EN 60947-3 2009
Part 3: Switches, disconnectors, switch- +A1 2012
disconnectors and fuse-combination units +A2 2015
IEC 60990 1999 Methods of measurement of touch current EN 60990 1999
and protective conductor current
IEC 61010-1 2010 Safety requirements for electrical EN 61010-1 2010
equipment for measurement, control and
laboratory use -- Part 1: General
requirements
IEC 61058-1 2000 Switches for appliances -- Part 1: General - -
requirements
+ A1 2001  EN 61058-1 2002
+ A2 2007  + A2 2008
+ corrigendum Jan. 2009  - -
IEC 61293 1994 Marking of electrical equipment with ratings EN 61293 1994
related to electrical supply - Safety
requirements
IEC 61558-1 2005 Safety of power transformers, power EN 61558-1 2005
supplies, reactors and similar products --
Part 1: General requirements and tests
- -  + corrigendum Aug. 2006
+ A1 2009 + A1 2009
IEC 61558-2 series Safety of power transformers, power EN 61558-2 series
supplies, reactors and similar products --
Part 2-1: Particular requirements and tests
for separating transformers and power
supplies incorporating separating
transformers for general applications
IEC 61810-1 2008 Electromechanical elementary relays -- EN 61810-1 2008
Part 1: General requirements
IEC 62368-1 2014 Audio/video, information and EN 62368-1 2014
communication technology equipment -- (mod)
Part 1: Safety requirements
- -  + AC 2015
- -  + A11 2017
- -  + AC 2017-03
IEC 62477-1 2012 Safety requirements for power electronic EN 62477-1 2012
converter systems and equipment -- Part 1:
General
- -  + A11 2014
Annex ZZ
(informative)
Relationship between this European Standard and the safety objectives of
Directive 2014/35/EU [2014 OJ L96] aimed to be covered
This European Standard has been prepared under a Commission’s standardization request relating to
harmonized standards in the field of the Low Voltage Directive, M/511, to provide one voluntary means
of conforming to safety objectives of Directive 2014/35/EU of the European Parliament and of the
Council of 26 February 2014 on the harmonization of the laws of the Member States relating to the
making available on the market of electrical equipment designed for use within certain voltage limits
[2014 OJ L96].
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZZ.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding safety objectives of
that Directive, and associated EFTA regulations.
Table ZZ.1 – Correspondence between this European Standard
and Annex I of Directive 2014/35/EU [2014 OJ L96]
Safety objectives of Clause(s) / sub-clause(s) Remarks / Notes
Directive 2014/35/EU of this EN
(1)(a) 6
(1)(b) 6
Annex AC 5
(1)(c) Refer to 2a) to 2d) and 3a) to
3c) in this table.
Refer to standard clause 1, 6
Annex AC 5
(2)(a) 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, Hazards arising from electric,
4.8, 4.11, 4.12, 5.2, Annex A, magnetic, and electromagnetic

Annex D, Annex F, Annex AA, fields, other ionizing and non-

Annex AC ionizing radiation are covered in

separate standards.
(2)(b)
4.3, 4.4, 4.6, 4.10, 4.11, 4.12,

Annex AC
(2)(c)
4.7, 4.9, 4.11, 4.12, 5.2
(2)(d)
4.1 4.2, 4.11, 4.12, 5.2, Annex
D, Annex F, Annex AA, Annex
AC
(3)(a) 4.7, 4.9, 4.12, 5.2 Hazards arising from electric,
magnetic, and electromagnetic
fields, other ionizing and non-
(3)(b) 4.2, 4.9, 5.2
ionizing radiation are covered in

separate standards.
(3)(c) 4.1, 4.2, 4.3, 5.2, Annex AA,
Hazards arising from
Annex AC
unattended operation have
been duly considered.
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
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

IEC 61204-7:2016  IEC 2016 – 3 –
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 . 43
5.1.1 Test objectives and classification . 43
5.1.2 Selection of test samples . 43
5.1.3 Sequence of tests . 43
5.1.4 Earthing conditions . 43
5.1.5 General conditions for tests . 43
5.1.6 Compliance . 44
5.1.7 Test overview . 44
5.2 Test specifications . 46
5.2.1 Visual inspections (type test, sample test and routine test) . 46
5.2.2 Mechanical tests . 46
5.2.3 Electrical tests . 48
5.2.4 Abnormal operation and simulated faults tests . 56
5.2.5 Material tests . 61
5.2.6 Environmental tests (type tests) . 61
5.2.7 Hydrostatic pressure test (type test and routine test) . 62
6 Information and marking requirements . 62
6.1 General . 62
6.2 Information for selection . 64
6.2.100 Additional marking requirements for SMPS . 64
6.2.101 Additional information for Component SMPS . 66
6.3 Information for installation and commissioning . 66
6.3.1 General . 66
6.3.2 Mechanical considerations . 66
6.3.3 Environment . 66
6.3.4 Handling and mounting . 66
6.3.5 Enclosure temperature. 66

– 4 – IEC 61204-7:2016  IEC 2016
6.3.6 Connections . 66
6.3.7 Protection requirements . 67
6.3.8 Commissioning . 69
6.4 Information for use . 69
6.4.1 General . 69
6.4.2 Adjustment . 69
6.4.3 Labels, signs and signals . 69
6.5 Information for maintenance . 69
6.5.1 General . 69
6.5.2 Capacitor discharge . 69
6.5.3 Auto restart/bypass connection . 69
6.5.4 Other hazards . 69
6.5.5 Equipment with multiple sources of supply . 69
6.5.100 Disconnect device external to permanently connected equipment . 70
6.5.101 Power cord acting as disconnecting device . 70
7 Components . 70
7.1 General . 70
7.2 Switches . 71
7.2.1 General . 71
7.2.2 Requirements for switches acting as disconnecting device . 71
7.2.3 Requirements for switches . 72
7.2.4 Test method and compliance criteria . 73
7.3 Overtemperature protection devices (thermal cut-offs or thermal links) . 73
7.4 PTC thermistors . 74
7.5 Overcurrent protective devices . 74
7.6 Protective devices not mentioned in 7.2 to 7.5 . 74
7.6.1 Other protective devices requirements . 74
7.6.2 Compliance and test method. 74
7.7 Transformers . 74
7.7.1 General . 74
7.7.2 Insulation . 75
7.8 Motors . 76
7.9 Mains supply cords . 76
7.9.1 General . 76
7.9.2 Fitting of non-detachable mains supply cords . 77
7.10 Surge Protective Devices (SPDs) . 79
7.10.1 Use of an SPD connected to reliable earthing . 79
7.10.2 Use of an SPD between mains and protective earth . 79
7.10.3 Bridging of supplementary, double or reinforced insulation by a SPD . 79
7.10.4 Circuits or components used as transient voltage limiting devices . 79
7.11 Wound components . 80
7.12 IC current limiters . 80
7.12.1 General . 80
7.12.2 Test program 1 . 81
7.12.3 Test program 2 . 81
7.12.4 Test program 3 . 81
7.13 Capacitors and RC units bridging insulation . 82
7.14 Optocouplers bridging insulation . 84
7.15 Relays . 84

IEC 61204-7:2016  IEC 2016 – 5 –
7.16 Electrolytic capacitors . 85
Annex A (normative) Additional information for protection against electric shock . 86
Annex B (informative) Considerations for the reduction of the pollution degree . 88
Annex C (informative) Symbols referred to in IEC 62477-1 . 89
Annex D (normative) Evaluation of clearance and creepage distances . 90
Annex E (informative) Altitude correction for clearances . 91
Annex F (normative) Clearance and creepage distance determination for frequencies
greater than 30 kHz . 92
Annex G (informative) Cross-sections of round conductors . 93
Annex H (informative) Guidelines for RCD compatibility . 94
Annex I (informative) Examples of overvoltage category reduction . 95
Annex J (informative) Burn thresholds for touchable surfaces . 96
Annex K (informative) Table of electrochemical potentials . 97
Annex L (informative) Measuring instrument for touch current measurements . 98
Annex M (informative) Test probes for determining access . 99
Annex AA (normative) Addition Insulated winding wires for use without interleaved
insulation . 100
Annex AB (informative) Minimum and maximum cross-section of copper conductors
suitable for connection to terminals for external conductors . 103
Annex AC (normative) DC power and distribution equipment . 104
Annex AD (informative) Addition Examples of protective measures according to
IEC 61204-7 clause 4.4.1 – 4.4.5 for protection against electrical shock . 119
Bibliography . 121

Figure 100 – Electric strength test instrument . 53
Figure 101 – Mandrel . 54
Figure 102 – Initial position of mandrel . 55
Figure 103 – Final position of mandrel . 55
Figure 104 – Position of metal foil on insulating material . 55
Figure 105 – Determination of arithmetic average temperature . 60
Figure 106 – Detachable mains supply cords and connections . 77
Figure AC.100 – Resistance and short circuit calculations . 107

Table 5 – Voltage limits . 24
Table 6 – Separation requirements for circuit under consideration . 25
Table 100 – Limits for access of current . 29
Table 101 – Tests for insulation in non-separable layers . 36
Table 22 – Test overview . 45
Table 102 – Temperature limits for transformer windings . 60
Table 36 – Information requirements . 63
Table 103 – Component requirements . 71
Table 104 – Peak surge current . 73
Table 105 – Strain relief test force . 78
Table 106 – Capacitor ratings according to IEC 60384-14 . 83

– 6 – IEC 61204-7:2016  IEC 2016
Table C.100 – Symbols . 89
Table AA.1 – Mandrel diameter . 101
Table AA.2 – Oven temperature . 101
Table AB.1 – Cross-section of copper conductors suitable for connection to terminals
for external conductors (extract from IEC 61439-1) . 103
Table AC.101 – AC and DC field wiring spacings . 111
Table AC.102 – Minimum acceptable spacings for uninsulated bus bars . 112
Table AC.103 – Temperature limits . 113
Table AC.104 – Switch test sequences . 115

IEC 61204-7:2016  IEC 2016 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCH MODE POWER SUPPLIES –

Part 7: Safety requirements
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,
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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
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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
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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 61204-7 has been prepared by subcommittee 22E: Stabilized
power supplies, of IEC technical committee 22: Power electronic systems and equipment.
This second edition cancels and replaces the first edition published in 2006. This edition
constitutes a complete technical revision.
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”.
IEC 61204-7 has the status of a product standard.

– 8 – IEC 61204-7:2016  IEC 2016
The text of this document is based on the following documents:
FDIS Report on voting
22E/175/FDIS 22E/177/RVD
Full information on the voting for the approval of this document can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 61204 series, published under the general title Low-voltage power
supplies, d.c. output, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
This International Standard is to be read in conjunction with IEC 62477-1:2012.
NOTE A consolidated version is under consideration.
The provisions of the general rules dealt with in IEC 62477-1:2012 are only applicable to this
document insofar as they are specifically cited. Clauses and subclauses of IEC 62477-1:2012
that are applicable in this document are identified by reference to the reference document, for
example, 4.3 of IEC 62477-1:2012.
Subclauses that are numbered starting from 100 are additional to those in IEC 62477-1:2012.
Additional tables and figures in this document are numbered starting from 100.
New annexes in this document are lettered AA, AB, AC, etc.
Wherever the word PECS (power electronic converter system) occurs in this reference
document, this means SMPS.
The wordings SMPS and "power supply" are considered to be identical throughout this
document.
References of the reference document to clauses or tables, which have been modified in this
document, shall be read as reference to the relevant clauses or tables of this document.
Refer to 3.100 for further information on how to read this document.
In this document, the following print types are used:
– Requirements proper and normative annexes: in roman type.
– Notes and other informative matter: in smaller roman type.
– Normative conditions within tables: in smaller roman type.
– Terms that are defined in clause 3 or IEC 62477-1:2012: Bold Italic.

IEC 61204-7:2016  IEC 2016 – 9 –
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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 document using a
colour printer.
– 10
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