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IEC 60947-7-4 Edition 1.0 2013-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-voltage switchgear and controlgear Part 7-4: Ancillary equipment PCB terminal blocks for copper conductors Appareillage basse tension Partie 7-4: Matriels accessoires Blocs de jonction pour cartes de circuits imprims pour conducteurs en cuivre IEC 60947-7-4:2013 colour inside Copyright International Electrotechnical Commission Provided by IHS under license with IEC Not for Resale, 02/20/2016 21:01:09 MSTNo reproduction or networking permitted without license from IHS -,-,- THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland 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 IECs 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 rservs. Sauf indication contraire, aucune partie de cette publication ne peut tre reproduite ni utilise sous quelque forme que ce soit et par aucun procd, lectronique ou mcanique, y compris la photocopie et les microfilms, sans laccord crit de la CEI ou du Comit national de la CEI du pays du demandeur. Si vous avez des questions sur le copyright de la CEI ou si vous dsirez obtenir des droits supplmentaires sur cette publication, utilisez les coordonnes ci-aprs ou contactez le Comit national de la CEI de votre pays de rsidence. IEC Central Office Tel.: +41 22 919 02 11 3, rue de Varemb Fax: +41 22 919 03 00 CH-1211 Geneva 20 infoiec.ch Switzerland www.iec.ch About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. Useful links: IEC publications search - www.iec.ch/searchpub The advanced search enables you to find IEC publications by a variety of criteria (reference number, text, technical committee,). It also gives information on projects, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published details all new publications released. Available on-line and also once a month by email. Electropedia - The worlds leading online dictionary of electronic and electrical terms containing more than 30 000 terms and definitions in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical Vocabulary (IEV) on-line. Customer Service Centre - webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: csciec.ch. A propos de la CEI La Commission Electrotechnique Internationale (CEI) est la premire organisation mondiale qui labore et publie des Normes internationales pour tout ce qui a trait llectricit, llectronique et aux technologies apparentes. A propos des publications CEI Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possdez ldition la plus rcente, un corrigendum ou amendement peut avoir t publi. Liens utiles: Recherche de publications CEI - www.iec.ch/searchpub La recherche avance vous permet de trouver des publications CEI en utilisant diffrents critres (numro de rfrence, texte, comit dtudes,). Elle donne aussi des informations sur les projets et les publications remplaces ou retires. Just Published CEI - webstore.iec.ch/justpublished Restez inform sur les nouvelles publications de la CEI. Just Published dtaille les nouvelles publications parues. Disponible en ligne et aussi une fois par mois par email. Electropedia - Le premier dictionnaire en ligne au monde de termes lectroniques et lectriques. Il contient plus de 30 000 termes et dfinitions en anglais et en franais, ainsi que les termes quivalents dans les langues additionnelles. Egalement appel Vocabulaire Electrotechnique International (VEI) en ligne. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. Copyright International Electrotechnical Commission Provided by IHS under license with IEC Not for Resale, 02/20/2016 21:01:09 MSTNo reproduction or networking permitted without license from IHS -,-,- IEC 60947-7-4 Edition 1.0 2013-08 INTERNATIONAL STANDARD NORME INTERNATIONALE Low-voltage switchgear and controlgear Part 7-4: Ancillary equipment PCB terminal blocks for copper conductors Appareillage basse tension Partie 7-4: Matriels accessoires Blocs de jonction pour cartes de circuits imprims pour conducteurs en cuivre INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE U ICS 29.130.20 PRICE CODE CODE PRIX ISBN 978-2-8322-1029-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside Copyright International Electrotechnical Commission Provided by IHS under license with IEC Not for Resale, 02/20/2016 21:01:09 MSTNo reproduction or networking permitted without license from IHS -,-,- 2 60947-7-4 IEC:2013 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 General . 7 1.1 Scope . 7 1.2 Normative references . 7 2 Terms and definitions . 9 3 Classification . 10 4 Characteristics . 10 4.1 Summary of characteristics . 10 4.2 Type of PCB terminal block . 10 4.3 Rated and limiting values . 10 4.3.1 Rated voltages . 10 4.3.2 Rated current . 10 4.3.3 Standard cross-sections . 10 4.3.4 Maximum cross-section . 11 4.3.5 Connecting capacity . 11 5 Product information . 12 5.1 Marking . 12 5.2 Additional information . 13 6 Normal service, mounting and transport conditions . 13 7 Constructional and performance requirements . 13 7.1 Constructional requirements . 13 7.1.1 Clamping units . 13 7.1.2 Mounting and installation . 14 7.1.3 Clearances and creepage distances . 14 7.1.4 Terminal identification and marking . 14 7.1.5 Resistance to abnormal heat and fire . 15 7.1.6 Maximum cross-section and connecting capacity . 15 7.2 Performance requirements . 15 7.2.1 Temperature rise . 15 7.2.2 Dielectric properties . 15 7.2.3 Short-time withstand current . 15 7.2.4 Contact resistance . 16 7.2.5 Ageing test (climatic sequence and corrosion test) . 16 7.3 Electromagnetic compatibility (EMC) . 16 8 Tests . 16 8.1 Kinds of test . 16 8.2 General . 16 8.3 Verification of mechanical characteristics . 17 8.3.1 General . 17 8.3.2 Attachment of the PCB terminal block on its support . 17 8.3.3 Vacant . 17 8.3.4 Verification of the maximum cross-section and connecting capacity . 17 8.3.5 Verification of maximum cross-section (special test with gauges) . 17 8.4 Verification of electrical characteristics . 17 8.4.1 General . 17 Copyright International Electrotechnical Commission Provided by IHS under license with IEC Not for Resale, 02/20/2016 21:01:09 MSTNo reproduction or networking permitted without license from IHS -,-,- 60947-7-4 IEC:2013 3 8.4.2 Verification of clearances and creepage distances. 18 8.4.3 Dielectric tests . 18 8.4.4 Verification of contact resistance . 19 8.4.5 Temperature rise test . 20 8.4.6 Short-time withstand current test . 22 8.4.7 Ageing test (climatic sequence and corrosion test) . 23 8.5 Verification of thermal characteristics . 24 8.6 Verification of EMC characteristics . 25 8.6.1 General . 25 8.6.2 Immunity. 25 8.6.3 Emission. 25 Annex A (informative) Structure of a PCB terminal block . 26 Annex B (informative) Additional Information to be specified between manufacturer and user . 27 Annex C (informative) Examples of PCBs and PCB terminal blocks for high current application . 28 Bibliography . 30 Figure 1 Test assembly for the measurement of contact resistance and temperature rise . 20 Figure 2 Example of wiring structure of a multi-tier PCB terminal block . 21 Figure 3 Test assembly for the measurement of short-time withstand current . 23 Figure 4 Test sequence . 24 Figure A.1 Structure of a PCB terminal block . 26 Figure C.1 Structure of a high current PCB . 28 Figure C.2 PCB terminal block with soldered connection to the PCB . 28 Figure C.3 PCB terminal block with screwed connection to the PCB . 29 Table 1 Standard cross-sections of copper conductors . 11 Table 2 Relationship between maximum cross-section and connecting capacity of PCB terminal blocks. 12 Table 3 Standards for clamping units and connecting methods . 14 Table 4 Impulse withstand test voltages . 19 Table 5 Dielectric test voltages corresponding to the rated insulation voltage . 19 Table 6 Length of connectable conductors and conductor loops . 21 Table 7 Examples of cross-sectional distribution of interconnections on printed circuit boards . 22 Copyright International Electrotechnical Commission Provided by IHS under license with IEC Not for Resale, 02/20/2016 21:01:09 MSTNo reproduction or networking permitted without license from IHS -,-,- 4 60947-7-4 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR Part 7-4: Ancillary equipment PCB terminal blocks for copper conductors 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 sh

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