IEC 61558-2-16:2009

IEC 61558-2-16 ®
Edition 1.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and similar products for
supply voltages up to 1 100 V –
Part 2-16: Particular requirements and tests for switch mode power supply units
and transformers for switch mode power supply units

Sécurité des transformateurs, bobines d’inductance, blocs d'alimentation et
produits analogues pour des tensions d’alimentation jusqu'à 1 100 V –
Partie 2-16: Règles particulières et essais pour les blocs d'alimentation à
découpage et les transformateurs pour blocs d'alimentation à découpage

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 la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: 0Hinmail@iec.ch
Web: 1Hwww.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.
ƒ Catalogue of IEC publications: 2Hwww.iec.ch/searchpub
The IEC on-line Catalogue enables you to search by a variety of criteria (reference number, text, technical committee,…).
It also gives information on projects, withdrawn and replaced publications.
ƒ IEC Just Published: 3Hwww.iec.ch/online_news/justpub
Stay up to date on all new IEC publications. Just Published details twice a month all new publications released. Available
on-line and also by email.
ƒ Electropedia: 4Hwww.electropedia.org
The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
ƒ Customer Service Centre: 5Hwww.iec.ch/webstore/custserv
If you wish to give us your feedback on this publication or need further assistance, please visit the Customer Service
Centre FAQ or contact us:
Email: 6Hcsc@iec.ch
Tel.: +41 22 919 02 11
Fax: +41 22 919 03 00
A propos de la CEI
La Commission Electrotechnique Internationale (CEI) 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 CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.
ƒ Catalogue des publications de la CEI: 7Hwww.iec.ch/searchpub/cur_fut-f.htm
Le Catalogue en-ligne de la CEI vous permet d’effectuer des recherches en utilisant différents critères (numéro de référence,
texte, comité d’études,…). Il donne aussi des informations sur les projets et les publications retirées ou remplacées.
ƒ Just Published CEI: 8Hwww.iec.ch/online_news/justpub
Restez informé sur les nouvelles publications de la CEI. Just Published détaille deux fois par mois les nouvelles
publications parues. Disponible en-ligne et aussi par email.
ƒ Electropedia: 9Hwww.electropedia.org
Le premier dictionnaire en ligne au monde de termes électroniques et électriques. Il contient plus de 20 000 termes et
définitions en anglais et en français, ainsi que les termes équivalents dans les langues additionnelles. Egalement appelé
Vocabulaire Electrotechnique International en ligne.
ƒ Service Clients: 10Hwww.iec.ch/webstore/custserv/custserv_entry-f.htm
Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions, visitez le FAQ du
Service clients ou contactez-nous:
Email: 11Hcsc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC 61558-2-16 ®
Edition 1.0 2009-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
GROUP SAFETY PUBLICATION
PUBLICATION GROUPÉE DE SÉCURITÉ
Safety of transformers, reactors, power supply units and similar products for
supply voltages up to 1 100 V –
Part 2-16: Particular requirements and tests for switch mode power supply units
and transformers for switch mode power supply units

Sécurité des transformateurs, bobines d’inductance, blocs d'alimentation et
produits analogues pour des tensions d’alimentation jusqu'à 1 100 V –
Partie 2-16: Règles particulières et essais pour les blocs d'alimentation à
découpage et les transformateurs pour blocs d'alimentation à découpage

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
V
CODE PRIX
ICS 29.180 ISBN 978-2-88910-543-4
– 2 – 61558-2-16 © IEC:2009
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references.8
3 Terms and definitions .9
4 General requirements .9
5 General notes on tests.9
6 Ratings.9
7 Classification .10
8 Marking and other information.10
9 Protection against electric shock.11
10 Change of input voltage setting .12
11 Output voltage and output current under load .12
12 No-load output voltage.12
13 Short circuit voltage .13
14 Heating.13
15 Short-circuit and overload protection .13
16 Mechanical strength.14
17 Protection against harmful ingress of dust, solid objects and moisture.14
18 Insulation resistance, dielectric strength and leakage current .14
19 Construction .14
20 Components .18
21 Internal wiring .18
22 Supply connection and other external flexible cables or cords.19
23 Terminals for external conductors .19
24 Provisions for protective earthing .19
25 Screws and connections .19
26 Creepage distances, clearances and distances through insulation .19
27 Resistance to heat, fire and tracking .32
28 Resistance to rusting .32
Annexes.33
Annex AA (informative) Partial discharge (PD) test .33
Annex BB (normative) Particular requirements for associated transformers for use in
switch mode power supplies with internal frequencies > 500 Hz .33

Figure 101 – Diagram for dimensioning of clearances.20
Figure 102 – Diagram of dimensioning creepage distances.24
Figure 103 – Permissible field strength for dimensioning of solid insulation according to
Equation (1) .32

Table 101 – Output voltages ratio.13
Table 102 – Values of clearances for frequencies > 30 kHz with approximately
homogeneous field condition according to 4.3 of IEC 60664-4 .21

61558-2-16 © IEC:2009 – 3 –
Table 103 – Values of clearances for transient overvoltages or recurring peak voltages
produced in the primary circuit of the SMPS for frequencies < 30 kHz.22
Table 104 – Minimum values of clearances in air for inhomogeneous field conditions for
frequency > 30 kHz .
Table 105 – Basic or supplementary insulation – Minimum values of creepage distances
for different frequency ranges (pollution degree 1).25
Table 106 – Basic or supplementary insulation – Minimum values of creepage distances
for different frequency ranges (pollution degree 2).26
Table 107 – Basic or supplementary insulation – Minimum values of creepage distances
for different frequency ranges (pollution degree 3).27
Table 108 – Double or reinforced insulation – Minimum values of creepage distances for
different frequency ranges (pollution degree 1) .28
Table 109 – Double or reinforced insulation – Minimum values of creepage distances for
different frequency ranges (pollution degree 2) .29
Table 110 – Double or reinforced insulation – Minimum values of creepage distances for
different frequency ranges (pollution degree 3) .30

– 4 – 61558-2-16 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SAFETY OF TRANSFORMERS, REACTORS, POWER SUPPLY UNITS
AND SIMILAR PRODUCTS FOR SUPPLY VOLTAGES UP TO 1 100 V –

Part 2-16: Particular requirements and tests for switch mode power supply
units and transformers for switch mode power supply units

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 hel
...