IEC 60664-5:2007

Insulation coordination for equipment within low-voltage systems - Part 5: Comprehensive method for determining clearances and creepage distances equal to or less than 2 mm

Specifies the dimensioning of clearances and creepage distances for spacings equal to or less than 2 mm for printed wiring board and equivalent constructions, where the clearance and the creepage distance are identical and are along the surface of solid insulation. The dimensioning in this standard is more precise than that provided by IEC 60664-1. However, if the precision provided by this standard is not required, IEC 60664-1 may be applied instead. This standard is based on the following criteria for dimensioning: - minimum clearances independent of the micro-environment; - minimum creepage distances for pollution degrees 1, 2 and 3 to avoid failure due to tracking; - minimum creepage distances to avoid flashover across the insulating surface. A test method is specified for allocating unclassified insulating material to the relevant water adsorption group. The following major technical changes are: - Amendment of Japanese mains conditions with regard to the rated impulse voltages, the rationalized voltages and the nominal voltages of supply systems for different modes of overvoltage control. - Amendment of dimensioning of clearances smaller than 0,01 mm. Alignment of the table and the corresponding formula regarding test voltages for verifying clearances at different altitudes. - Amendment of interpolation of the creepage distance values for functional insulation. - Revision of the former Clause 4 "Tests and measurements" (now Clause 6) to achieve a more detailed description of the tests and their purpose, the test equipment and possible alternatives. Has the status of a basic safety publication in accordance with IEC Guide 104.

Coordination de l'isolement des matériels dans les systèmes (réseaux) à basse tension - Partie 5: Méthode détaillée de détermination des distances d'isolement dans l'air et des lignes de fuite inférieures ou égales à 2 mm

Spécifie le dimensionnement des distances d'isolement et des lignes de fuite pour les espacements inférieurs ou égaux à 2 mm pour les cartes imprimées et constructions équivalentes, pour lesquelles les distances d'isolement et les lignes de fuite sont identiques et suivent les surfaces de l'isolation solide. Le dimensionnement dans la présente norme est plus précis que celui donné par la CEI 60664-1. Toutefois, si la précision apportée par la présente norme n'est pas nécessaire, il est autorisé d'utiliser à sa place la CEI 60664-1. La présente norme est basée sur les critères suivants pour le dimensionnement: - distances d'isolement minimales indépendamment du micro-environnement; - lignes de fuite minimales pour les degrés de pollution 1, 2 et 3 pour éviter toute défaillance due au cheminement; - lignes de fuite minimales pour éviter tout contournement pouvant apparaître à travers la surface isolante. Une méthode d'essai est spécifiée pour affecter les matériaux isolants non classés au groupe d'adsorption d'eau approprié. Les modifications techniques majeures suivantes sont : - Modification des conditions du réseau électrique au Japon en ce qui concerne les tensions assignées de tenue de choc, les tensions rationalisées et les tensions nominales des réseaux d'alimentation pour différents modes de contrôle des surtensions. - Modification du dimensionnement des distances d'isolement dans l'air inférieures à 0,01 mm. - Alignement du tableau et des formules correspondantes concernant les tensions d'essai pour la vérification des distances d'isolement dans l'air à différentes altitudes. - Modification de l'interpolation des valeurs de ligne de fuite pour l'isolation fonctionnelle. - Révision de l'ancien Article 4 "Essais et mesures" (désormais Article 6) pour obtenir une description plus détaillée des essais et de leur objet, du matériel d'essai et des alternatives existantes. A le statut de publication fondamentale de sécurité, conformément au Guide CEI 104.

General Information

• Status: Withdrawn
• Publication Date: 29-Jul-2007
• Withdrawal Date: 30-Dec-2014
• ICS: 29.080.30 - Insulation systems
• Technical Committee: TC 109 - Insulation co-ordination for low-voltage equipment
• Drafting Committee: MT 1 - TC 109/MT 1
• Current Stage: WPUB - Publication withdrawn
• Completion Date: 31-Dec-2014

Relations

• Revises: IEC 60664-5:2003 - Insulation coordination for equipment within low-voltage systems - Part 5: A comprehensive method for determining clearances and creepage distances equal to or less than 2 mm
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
CEI
60664-5
NORME
Second edition
INTERNATIONALE
Deuxième édition
2007-07
PUBLICATION FONDAMENTALE DE SÉCURITÉ
BASIC SAFETY PUBLICATION
Insulation coordination for equipment within
low-voltage systems –
Part 5:
Comprehensive method for determining
clearances and creepage distances equal to
or less than 2 mm
Coordination de l'isolement des matériels
dans les systèmes (réseaux) à basse tension –
Partie 5:
Méthode détaillée de détermination des distances
d’isolement dans l’air et des lignes de fuite
inférieures ou égales à 2 mm
Reference number
Numéro de référence
IEC/CEI 60664-5:2007
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: [e-mail]
Web: 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.
ƒ Catalogue of IEC publications: www.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: www.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 Customer Service Centre: www.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: [e-mail]
Tel.: [phone]
Fax: [phone]
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: www.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: www.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 Service Clients: www.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: [e-mail]
Tél.: [phone]
Fax: [phone]
INTERNATIONAL IEC
STANDARD
CEI
60664-5
NORME
Second edition
INTERNATIONALE
Deuxième édition
2007-07
PUBLICATION FONDAMENTALE DE SÉCURITÉ
BASIC SAFETY PUBLICATION
Insulation coordination for equipment within
low-voltage systems –
Part 5:
Comprehensive method for determining
clearances and creepage distances equal to
or less than 2 mm
Coordination de l'isolement des matériels
dans les systèmes (réseaux) à basse tension –
Partie 5:
Méthode détaillée de détermination des distances
d’isolement dans l’air et des lignes de fuite
inférieures ou égales à 2 mm
PRICE CODE
X
CODE PRIX
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur

– 2 – 60664-5 © IEC:2007
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope and object .7
2 Normative references.7
3 Terms and definitions .8
4 Fundamentals of clearance and creepage distance dimensioning .8
4.1 Introductory remark .8
4.2 Basic principles .8
4.3 Voltages and voltage ratings .9
4.4 Frequency .11
4.5 Time under voltage stress.11
4.6 Pollution .11
4.7 Information supplied with the equipment .12
4.8 Insulating material .12
5 Requirements and dimensioning procedures .14
5.1 General .14
5.2 Dimensioning of clearances .14
5.3 Dimensioning of creepage distances .18
5.4 Requirements for design of solid insulation .23
6 Tests and measurements.26
6.1 Tests.26
6.2 Measurement of creepage distances and clearances.33

Annex A (informative) Dimensioning to maintain minimum insulation resistance.34
Annex B (normative) Water adsorption test.36
Annex C (informative) Dimensioning diagrams.40
Annex D (informative) Withstand voltage test for creepage distance under humid
conditions .43

Bibliography .44

Figure 1 – Test voltages.32
Figure B.1 – Layout of the test sample.37
Figure B.2 – Test circuit .38
Figure B.3 – Critical relative humidity of insulating materials .39
Figure C.1 – Diagram for dimensioning clearances for circuits directly connected to the
supply mains.40
Figure C.2 – Diagram for dimensioning clearances for circuits not directly connected to
the supply mains .41
Figure C.3 – Diagram for dimensioning of creepage distances .42
Figure D.1 – The arrangement for the withstand voltage test.43

60664-5 © IEC:2007 – 3 –
Table 1 – Relation between the humidity levels and macro-environmental classes .12
Table 2 – Clearances to withstand transient overvoltages .15
Table 3 – Clearances to withstand steady-state voltages, temporary overvoltages or
recurring peak voltages .16
Table 4 – Creepage distances to avoid failure due to tracking.20
Table 5 – Creepage distances to avoid flashover .21
Table A.1 – Minimum insulation resistance .34
Table A.2 – Creepage distances to maintain minimum insulation resistance.35

– 4 – 60664-5 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
INSULATION COORDINATION FOR EQUIPMENT
WITHIN LOW-VOLTAGE SYSTEMS –
Part 5: Comprehensive method for determining clearances
and creepage distances equal to or less than 2 mm

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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 60664-5 has been prepared by IEC technical committee 109:
Insulation coordination for low-voltage equipment.
This second edition cancels and replaces the first edition, published in 2003 and constitutes a
technical revision.
The revision of Part 1 of IEC 60664 also required a revision of Part 5 of IEC 60664, as Part 5 is
closely linked to Part 1. In addition to a number of editorial improvements, the following major
technical changes made in Part 1 also apply for Part 5:
• Am
...