IEC TR 60664-2-1:2011
(Main)Insulation coordination for equipment within low-voltage systems - Part 2-1: Application guide - Explanation of the application of the IEC 60664 series, dimensioning examples and dielectric testing
Insulation coordination for equipment within low-voltage systems - Part 2-1: Application guide - Explanation of the application of the IEC 60664 series, dimensioning examples and dielectric testing
IEC/TR 60664-2-1:2011, which is a technical report, serves as an application guide for technical committees and manufacturers specifying dimensioning requirements for products in accordance with the IEC 60664 series. The significant items for consideration are as follows:
a) nominal system voltage(s) or rated insulation voltage(s);
b) overvoltage category of the products (OV cat.);
c) any type of overvoltages;
d) frequency of the voltage;
e) characteristics of the solid insulating material;
f) pollution degree and humidity levels.
The main changes with respect to the previous edition are listed below:
- the previous edition was only an application guide for IEC 60664-1. This second edition takes into account not only IEC 60664-1 but also the other parts IEC 60664-3, IEC 60664-4, and IEC 60664-5 and their interrelation;
- principles of the IEC 60664 series for insulation dimensioning of LV equipment are explained and examples of practical application are provided together with some background information;
- Annex A provides an overview of clauses of IEC 60664-1 requiring decisions by technical committees, or specification of options, or requiring activities of the manufacturer;
- Annex B provides an overview of such clauses of IEC 60664-4;
- Annex C provides an overview of such clauses of IEC 60664-5;
- Annex D amends the tables of Annex F of IEC 60664-1:2007 with rated impulse voltages for voltages line to neutral derived from nominal d.c. voltages up to and including 1 500 V.
The contents of the corrigendum of October 2011 have been included in this copy.
Coordination de l'isolement des matériels dans les systèmes (réseaux) à basse tension - Partie 2-1: Guide d'application - Explication de l'application de la série CEI 60664, exemples de dimensionnement et d'essais diélectriques
La CEI/TR 60664-2-1:2011 qui est un rapport technique, sert comme guide d'application aux comités d'études et aux fabricants en spécifiant les exigences en matière de dimensionnement des produits conformes à la série CEI 60664. Les éléments significatifs à prendre en compte sont les suivants:
a) la/les tension(s) nominale(s) du réseau ou la/les tension(s) assignée(s) d'isolement;
b) la catégorie de surtension des produits (cat. OV);
c) tous les types de surtension;
d) la fréquence de la tension;
e) les caractéristiques du matériau isolant solide;
f) le degré de pollution et les niveaux d'humidité.
Les modifications principles par rapport à l'édition précédente sont les suivantes:
- l'édition précédente n'était qu'un guide d'application pour la CEI 60664-1. Cette deuxième édition prend en compte non seulement la CEI 60664-1 mais également les autres parties qui sont les CEI 60664-3, CEI 60664-4, et CEI 60664-5 et leurs relations mutuelles;
- les principes de la série 60664 concernant le dimensionnement de l'isolement des appareils basse tension sont expliqués et des exemples d'application pratiques sont fournis avec des informations de base;
- l'Annexe A fournit une vue d'ensemble des articles de la CEI 60664-1 nécessitant des décisions des comités techniques, ou des spécifications des options, ou nécessitant les activités du fabricant;
- l'Annexe B fournit une vue d'ensemble de tels articles de la CEI 60664-4;
- l'Annexe C fournit une vue d'ensemble de tels articles de la CEI 60664-5;
- l'Annexe D amende les tableaux de l'Annexe F de la CEI 60664-1:2007 avec des tensions d'impulsion assignées concernant les tensions phase-neutre dérivées des tensions nominales en courant continu allant jusqu'à 1 500 V inclus.
Le contenu du corrigendum d'octobre 2011 a été pris en considération dans cet exemplaire.
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IEC/TR 60664-2-1 ®
Edition 2.0 2011-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Insulation coordination for equipment within low-voltage systems –
Part 2-1: Application guide – Explanation of the application of
the IEC 60664 series, dimensioning examples and dielectric testing
Coordination de l'isolement des matériels dans les systèmes (réseaux) à basse
tension –
Partie 2-1: Guide d'application – Explication de l’application de la série
CEI 60664, exemples de dimensionnement et d’essais diélectriques
IEC/TR 60664-2-1:2011
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.
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Email: inmail@iec.ch
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.
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Vocabulary online.
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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.
Catalogue des publications de la CEI: www.iec.ch/searchpub/cur_fut-f.htm
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Vocabulaire Electrotechnique International en ligne.
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IEC/TR 60664-2-1 ®
Edition 2.0 2011-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Insulation coordination for equipment within low-voltage systems –
Part 2-1: Application guide – Explanation of the application of
the IEC 60664 series, dimensioning examples and dielectric testing
Coordination de l'isolement des matériels dans les systèmes (réseaux) à basse
tension –
Partie 2-1: Guide d'application – Explication de l’application de la série
CEI 60664, exemples de dimensionnement et d’essais diélectriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XB
ICS 29.080.30 ISBN 978-2-88912-351-3
– 2 – TR 60664-2-1 IEC:2011
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Principles and practical application of the IEC 60664 series for insulation
dimensioning of LV equipment . 17
4.1 Basic principles . 17
4.2 Coordination of overvoltage categories inside equipment . 17
4.3 Practical use of the IEC 60664 series for the dimensioning of clearances . 18
4.3.1 General . 18
4.3.2 Practical use of Tables F.2 and F.7 of IEC 60664-1:2007 for the
dimensioning of clearances . 18
4.3.3 Practical use of Tables 2 and 3 of IEC 60664-5:2007 for the
dimensioning of clearances . 20
4.4 Practical use of the IEC 60664 series for the dimensioning of creepage
distances . 20
4.4.1 General . 20
4.4.2 Practical use of Table F.4 of IEC 60664-1:2007 and Table 4 of
IEC 60664-5:2007 for the dimensioning of creepage distances . 21
4.4.3 Practical use of Table 5 in IEC 60664-5:2007 for dimensioning of
creepage distances . 22
4.4.4 Practical use of IEC 60664-1:2007 for checking the dimensioning of
creepage distances with regard to time under voltage stress . 22
4.4.5 Practical use of IEC 60664-3:2003 for the reduction of micro-
environmental conditions for the dimensioning of creepage distances . 23
4.5 Practical use of the IEC 60664 series for the dimensioning of solid insulation . 23
4.5.1 General . 23
4.5.2 Coordination of clearances and solid insulation . 24
4.5.3 Practical information for checking the correct dimensioning of solid
insulation . 25
4.6 Practical use of the IEC 60664 series for designing functional insulation . 31
4.6.1 General . 31
4.6.2 Dimensioning and testing of functional isolation compared to basic
insulation . 31
4.7 Practical use of the IEC 60664 series for dimensioning with respect to the
influence of the frequency of the voltage . 32
4.7.1 General influence of the frequency on withstand characteristics . 32
4.7.2 Influence of the frequency on the withstand characteristics of
clearances . 32
4.7.3 Influence of frequency on the withstand characteristics of creepage
distances . 32
4.7.4 Influence of frequency on the withstand characteristics of solid
insulation . 33
5 Four examples showing appropriate dimensioning of insulation within equipment . 34
5.1 General . 34
5.2 Examples for the dimensioning of clearances for class I equipment according
to IEC 60664-1 . 36
TR 60664-2-1 IEC:2011 – 3 –
5.3 Examples for the dimensioning of clearances for class II equipment
according to IEC 60664-1 . 37
5.4 Examples for the dimensioning of clearances for class II equipment
according to IEC 60664-5 . 39
6 Practical application of the IEC 60664 series with regards to particular questions . 40
6.1 General . 40
6.2 Testing complete equipment in case of components bridging the basic
insulation. 40
6.3 Testing complete equipment in case of components bridging the functional
insulation. 41
6.3.1 General . 41
6.3.2 Verification of clearances and creepage distances . 41
6.3.3 Verification of components bridging the insulation . 42
6.4 Dimensioning of insulation distances for parts of equipment which can have
isolation capability . 42
6.4.1 General . 42
6.4.2 Dimensioning for device associated with an equipment declared
suitable for isolation . 42
6.4.3 Dimensioning for device associated with an equipment not declared
suitable for isolation . 42
6.5 Testing with respect to high-frequency voltage stress . 43
6.6 Practical information in case of substitution an impulse withstand test by an
AC or DC test . 43
6.6.1 General . 43
6.6.2 Characteristics of the a.c. voltage substituted to an impulse
withstand test for dielectric test . 43
6.6.3 Characteristics of the d.c. voltage substituted to an impulse
withstand test for dielectric test . 44
7 Examples of a dimensioning worksheet (based on case A as described in
IEC 60664-1:2007) . 44
7.1 Use of IEC 60664-1:2007, for circuits in equipment either directly or not
directly connected to the mains supply . 44
7.2 Use of IEC 60664-5:2007, for circuits in equipment either directly or not
directly connected to the mains supply . 45
7.3 Use of IEC 60664-4:2005, for circuits in equipment either directly or not
directly connected to the mains supply . 46
7.4 Examples comparing the dimensioning of clearances and creepage
distances according to IEC 60664-1 and IEC 60664-5 based on case A
condition (basic insulation, for equipment up to 2 000 m altitude) . 48
7.4.1 Circuits not directly connected to mains supply . 48
7.4.2 Circuits n
...
IEC/TR 60664-2-1 ®
Edition 2.0 2011-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Insulation coordination for equipment within low-voltage systems –
Part 2-1: Application guide – Explanation of the application of
the IEC 60664 series, dimensioning examples and dielectric testing
Coordination de l'isolement des matériels dans les systèmes (réseaux) à basse
tension –
Partie 2-1: Guide d'application – Explication de l’application de la série
CEI 60664, exemples de dimensionnement et d’essais diélectriques
IEC/TR 60664-2-1:2011
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: inmail@iec.ch
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.
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.
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.
Electropedia: www.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.
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: csc@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.
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.
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.
Electropedia: www.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.
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: csc@iec.ch
Tél.: +41 22 919 02 11
Fax: +41 22 919 03 00
IEC/TR 60664-2-1 ®
Edition 2.0 2011-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
colour
inside
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Insulation coordination for equipment within low-voltage systems –
Part 2-1: Application guide – Explanation of the application of
the IEC 60664 series, dimensioning examples and dielectric testing
Coordination de l'isolement des matériels dans les systèmes (réseaux) à basse
tension –
Partie 2-1: Guide d'application – Explication de l’application de la série
CEI 60664, exemples de dimensionnement et d’essais diélectriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX XB
ICS 29.080.30 ISBN 978-2-88912-351-3
– 2 – TR 60664-2-1 IEC:2011
CONTENTS
FOREWORD . 6
INTRODUCTION . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions . 10
4 Principles and practical application of the IEC 60664 series for insulation
dimensioning of LV equipment . 17
4.1 Basic principles . 17
4.2 Coordination of overvoltage categories inside equipment . 17
4.3 Practical use of the IEC 60664 series for the dimensioning of clearances . 18
4.3.1 General . 18
4.3.2 Practical use of Tables F.2 and F.7 of IEC 60664-1:2007 for the
dimensioning of clearances . 18
4.3.3 Practical use of Tables 2 and 3 of IEC 60664-5:2007 for the
dimensioning of clearances . 20
4.4 Practical use of the IEC 60664 series for the dimensioning of creepage
distances . 20
4.4.1 General . 20
4.4.2 Practical use of Table F.4 of IEC 60664-1:2007 and Table 4 of
IEC 60664-5:2007 for the dimensioning of creepage distances . 21
4.4.3 Practical use of Table 5 in IEC 60664-5:2007 for dimensioning of
creepage distances . 22
4.4.4 Practical use of IEC 60664-1:2007 for checking the dimensioning of
creepage distances with regard to time under voltage stress . 22
4.4.5 Practical use of IEC 60664-3:2003 for the reduction of micro-
environmental conditions for the dimensioning of creepage distances . 23
4.5 Practical use of the IEC 60664 series for the dimensioning of solid insulation . 23
4.5.1 General . 23
4.5.2 Coordination of clearances and solid insulation . 24
4.5.3 Practical information for checking the correct dimensioning of solid
insulation . 25
4.6 Practical use of the IEC 60664 series for designing functional insulation . 31
4.6.1 General . 31
4.6.2 Dimensioning and testing of functional isolation compared to basic
insulation . 31
4.7 Practical use of the IEC 60664 series for dimensioning with respect to the
influence of the frequency of the voltage . 32
4.7.1 General influence of the frequency on withstand characteristics . 32
4.7.2 Influence of the frequency on the withstand characteristics of
clearances . 32
4.7.3 Influence of frequency on the withstand characteristics of creepage
distances . 32
4.7.4 Influence of frequency on the withstand characteristics of solid
insulation . 33
5 Four examples showing appropriate dimensioning of insulation within equipment . 34
5.1 General . 34
5.2 Examples for the dimensioning of clearances for class I equipment according
to IEC 60664-1 . 36
TR 60664-2-1 IEC:2011 – 3 –
5.3 Examples for the dimensioning of clearances for class II equipment
according to IEC 60664-1 . 37
5.4 Examples for the dimensioning of clearances for class II equipment
according to IEC 60664-5 . 39
6 Practical application of the IEC 60664 series with regards to particular questions . 40
6.1 General . 40
6.2 Testing complete equipment in case of components bridging the basic
insulation. 40
6.3 Testing complete equipment in case of components bridging the functional
insulation. 41
6.3.1 General . 41
6.3.2 Verification of clearances and creepage distances . 41
6.3.3 Verification of components bridging the insulation . 42
6.4 Dimensioning of insulation distances for parts of equipment which can have
isolation capability . 42
6.4.1 General . 42
6.4.2 Dimensioning for device associated with an equipment declared
suitable for isolation . 42
6.4.3 Dimensioning for device associated with an equipment not declared
suitable for isolation . 42
6.5 Testing with respect to high-frequency voltage stress . 43
6.6 Practical information in case of substitution an impulse withstand test by an
AC or DC test . 43
6.6.1 General . 43
6.6.2 Characteristics of the a.c. voltage substituted to an impulse
withstand test for dielectric test . 43
6.6.3 Characteristics of the d.c. voltage substituted to an impulse
withstand test for dielectric test . 44
7 Examples of a dimensioning worksheet (based on case A as described in
IEC 60664-1:2007) . 44
7.1 Use of IEC 60664-1:2007, for circuits in equipment either directly or not
directly connected to the mains supply . 44
7.2 Use of IEC 60664-5:2007, for circuits in equipment either directly or not
directly connected to the mains supply . 45
7.3 Use of IEC 60664-4:2005, for circuits in equipment either directly or not
directly connected to the mains supply . 46
7.4 Examples comparing the dimensioning of clearances and creepage
distances according to IEC 60664-1 and IEC 60664-5 based on case A
condition (basic insulation, for equipment up to 2 000 m altitude) . 48
7.4.1 Circuits not directly connected to mains supply . 48
7.4.2 Circuits n
...
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