IEC 60947-7-4:2019
(Main)Low-voltage switchgear and controlgear - Part 7-4: Ancillary equipment - PCB terminal blocks for copper conductors
Low-voltage switchgear and controlgear - Part 7-4: Ancillary equipment - PCB terminal blocks for copper conductors
IEC 60947-7-4:2019 specifies requirements for PCB terminal blocks primarily intended for industrial or similar use. Mounting and fixing on the printed circuit board is made by soldering, press-in or equivalent methods to provide electrical and mechanical connection between copper conductors and the printed circuit board. This document applies to PCB terminal blocks intended to connect copper conductors, with or without special preparation, having a cross-section between 0,08 mm2 and 300 mm2 (AWG 28-600 kcmil), intended to be used in circuits of a rated voltage not exceeding 1 000 V AC up to 1 000 Hz or 1 500 V DC. This second edition cancels and replaces the first edition published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) additional test for PCB terminal blocks with clamping units, where contact pressure is transmitted through insulating materials;
b) tightening torques for screws now given in Table 4 of this document (previously given in Table 4 of IEC 60947-1:2007); tightening torques added for an additional type of screw;
c) new criteria for verification of contact resistance introduced;
d) clarification in the description of the temperature-rise test (current-temperature derating); corrections in the test sequence according to Figure 4.
Appareillage à basse tension - Partie 7-4: Matériels accessoires - Blocs de jonction pour cartes de circuits imprimés pour conducteurs en cuivre
L'IEC 60947-7-4:2018 spécifie les exigences concernant les blocs de jonction pour cartes de circuits imprimés destinés principalement à un usage industriel ou similaire. Le montage et la fixation sur la carte de circuits imprimés s'effectuent par brasage, insertion à force ou par des méthodes équivalentes afin d'assurer une connexion électrique et mécanique entre les conducteurs en cuivre et la carte de circuits imprimés. Le présent document s'applique aux blocs de jonction pour cartes de circuits imprimés destinés à connecter les conducteurs en cuivre, avec ou sans préparation spéciale, dont la section est comprise entre 0,08 mm2 et 300 mm2 (AWG 28-600 kcmil), destinés à être utilisés dans les circuits dont la tension assignée ne dépasse pas 1 000 V en courant alternatif jusqu'à 1 000 Hz ou 1 500 V en courant continu au maximum. Cette deuxième édition annule et remplace la première édition parue en 2013. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) essai complémentaire pour les blocs de jonction pour cartes de circuits imprimés à organes de serrage pour lesquels la pression de contact est transmise par des matériaux isolants;
b) les couples de serrage des vis sont désormais présentés dans le Tableau 4 du présent document (ils étaient précédemment donnés dans le Tableau 4 de l'IEC 60947-1:2007); les couples de serrage sont donnés pour un type supplémentaire de vis;
c) ajout de nouveaux critères pour la vérification de la résistance de contact;
d) clarification de la description de l'essai d'échauffement (taux de réduction de l'intensité en fonction de la température); corrections de la séquence d'essais conformément à la Figure 4.
General Information
Relations
Buy Standard
Standards Content (Sample)
IEC 60947-7-4 ®
Edition 2.0 2019-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear –
Part 7-4: Ancillary equipment – PCB terminal blocks for copper conductors
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.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60947-7-4 ®
Edition 2.0 2019-01
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Low-voltage switchgear and controlgear –
Part 7-4: Ancillary equipment – PCB terminal blocks for copper conductors
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.130.20 ISBN 978-2-8322-6451-5
– 2 – IEC 60947-7-4:2019 RLV IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Classification . 10
5 Characteristics . 10
5.1 Summary of characteristics . 10
5.2 Type of PCB terminal block . 10
5.3 Rated and limiting values . 11
5.3.1 Rated voltages . 11
5.3.2 Rated current . 11
5.3.3 Standard cross-sections . 11
5.3.4 Maximum cross-section . 12
5.3.5 Connecting capacity . 12
6 Product information . 13
6.1 Marking . 13
6.2 Additional information . 14
7 Normal service, mounting and transport conditions . 14
8 Constructional and performance requirements . 14
8.1 Constructional requirements . 14
8.1.1 Clamping units . 14
8.1.2 Mounting and installation . 15
8.1.3 Clearances and creepage distances . 15
8.1.4 Terminal identification and marking . 15
8.1.5 Resistance to abnormal heat and fire . 16
8.1.6 Maximum cross-section and connecting capacity . 16
8.2 Performance requirements . 16
8.2.1 Temperature-rise (current-temperature derating) . 16
8.2.2 Dielectric properties . 16
8.2.3 Short-time withstand current . 16
8.2.4 Contact resistance . 17
8.2.5 Ageing tests . 17
8.3 Electromagnetic compatibility (EMC) . 17
9 Tests . 17
9.1 Kinds of test . 17
9.2 General . 17
9.3 Verification of mechanical characteristics . 18
9.3.1 General . 18
9.3.2 Attachment of the PCB terminal block on its support . 18
9.3.3 Vacant . 19
9.3.4 Verification of the maximum cross-section and connecting capacity . 19
9.3.5 Verification of maximum cross-section (special test with gauges) . 19
9.4 Verification of electrical characteristics . 20
9.4.1 General . 20
9.4.2 Verification of clearances and creepage distances . 20
9.4.3 Dielectric tests . 20
9.4.4 Verification of contact resistance . 21
9.4.5 Temperature-rise test (current-temperature derating) . 23
9.4.6 Short-time withstand current test . 25
9.4.7 Ageing tests . 26
9.5 Verification of thermal characteristics. 30
9.6 Verification of EMC characteristics . 31
9.6.1 General . 31
9.6.2 Immunity . 31
9.6.3 Emission . 31
Annex A (informative) Structure of a PCB terminal block . 32
Annex B (informative) Additional information to be specified between the manufacturer
and the user . 33
B.1 Additional information available on request of the user . 33
B.2 Information for testing in addition to those mentioned above . 33
Annex C (informative) Examples of PCBs and PCB terminal blocks for high-current
application . 34
C.1 Layout of high-current PCBs (schematic diagram) . 34
C.2 High-current PCB terminal blocks . 35
Bibliography . 36
Figure 1 – Test assembly for the measurement of contact resistance and temperature-rise . 23
Figure 2 – Example of wiring structure of a multi-tier PCB terminal block . 24
Figure 3 – Test assembly for the measurement of short-time withstand current . 26
Figure 4 – Test sequence . 27
Figure 5 – Test sequence for PCB terminal blocks with contact pressure via insulating
material . 28
Figure 6 – Current cycling ageing test procedure . 30
Figure A.1 – Structure of a PCB terminal block . 32
Figure C.1 – Structure of a high current PCB . 34
Figure C.2 – PCB terminal block with soldered connection to the PCB . 35
Figure C.3 – PCB terminal block with screwed connection to the PCB . 35
Table 1 – Standard cross-sections of copper conductors . 12
Table 2 – Relationship between maximum cross-section and connecting capacity of
PCB terminal blocks. 13
Table 3 – Standards for clamping units and connecting methods . 14
Table 4 – Tightening torques for PCB terminal blocks with screw-type clamping units . 19
Table 5 – Impulse withstand test voltages . 21
Table 6 – Dielectric test voltages corresponding to the rated insulation voltage . 21
Table 7 – Length of connectable conductors and conductor loops . 24
Table 8 – Examples of cross-sectional distribution of interconnections on printed
circuit boards . 25
– 4 – IEC 60947-7-4:2019 RLV IEC 2019
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 w
...
IEC 60947-7-4 ®
Edition 2.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –
Part 7-4: Ancillary equipment – PCB terminal blocks for copper conductors
Appareillage à basse tension –
Partie 7-4: Matériels accessoires – Blocs de jonction pour cartes de circuits
imprimés pour conducteurs en cuivre
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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) 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 IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.
IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées
antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 60947-7-4 ®
Edition 2.0 2019-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Low-voltage switchgear and controlgear –
Part 7-4: Ancillary equipment – PCB terminal blocks for copper conductors
Appareillage à basse tension –
Partie 7-4: Matériels accessoires – Blocs de jonction pour cartes de circuits
imprimés pour conducteurs en cuivre
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20 ISBN 978-2-8322-6402-7
– 2 – IEC 60947-7-4:2019 IEC 2019
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
4 Classification . 10
5 Characteristics . 10
5.1 Summary of characteristics . 10
5.2 Type of PCB terminal block . 10
5.3 Rated and limiting values . 10
5.3.1 Rated voltages . 10
5.3.2 Rated current . 11
5.3.3 Standard cross-sections . 11
5.3.4 Maximum cross-section . 12
5.3.5 Connecting capacity . 12
6 Product information . 13
6.1 Marking . 13
6.2 Additional information . 13
7 Normal service, mounting and transport conditions . 13
8 Constructional and performance requirements . 13
8.1 Constructional requirements . 13
8.1.1 Clamping units . 13
8.1.2 Mounting and installation . 14
8.1.3 Clearances and creepage distances . 14
8.1.4 Terminal identification and marking . 14
8.1.5 Resistance to abnormal heat and fire . 15
8.1.6 Maximum cross-section and connecting capacity . 15
8.2 Performance requirements . 15
8.2.1 Temperature-rise (current-temperature derating) . 15
8.2.2 Dielectric properties . 15
8.2.3 Short-time withstand current . 15
8.2.4 Contact resistance . 16
8.2.5 Ageing tests . 16
8.3 Electromagnetic compatibility (EMC) . 16
9 Tests . 16
9.1 Kinds of test . 16
9.2 General . 16
9.3 Verification of mechanical characteristics . 17
9.3.1 General . 17
9.3.2 Attachment of the PCB terminal block on its support . 17
9.3.3 Vacant . 18
9.3.4 Verification of the maximum cross-section and connecting capacity . 18
9.3.5 Verification of maximum cross-section (special test with gauges) . 18
9.4 Verification of electrical characteristics . 19
9.4.1 General . 19
9.4.2 Verification of clearances and creepage distances . 19
9.4.3 Dielectric tests . 19
9.4.4 Verification of contact resistance . 20
9.4.5 Temperature-rise test (current-temperature derating) . 22
9.4.6 Short-time withstand current test . 24
9.4.7 Ageing tests . 25
9.5 Verification of thermal characteristics. 29
9.6 Verification of EMC characteristics . 30
9.6.1 General . 30
9.6.2 Immunity . 30
9.6.3 Emission . 30
Annex A (informative) Structure of a PCB terminal block . 31
Annex B (informative) Additional information to be specified between the manufacturer
and the user . 32
B.1 Additional information available on request of the user . 32
B.2 Information for testing in addition to those mentioned above . 32
Annex C (informative) Examples of PCBs and PCB terminal blocks for high-current
application . 33
C.1 Layout of high-current PCBs (schematic diagram) . 33
C.2 High-current PCB terminal blocks . 34
Bibliography . 35
Figure 1 – Test assembly for the measurement of contact resistance and temperature-rise . 22
Figure 2 – Example of wiring structure of a multi-tier PCB terminal block . 23
Figure 3 – Test assembly for the measurement of short-time withstand current . 25
Figure 4 – Test sequence . 26
Figure 5 – Test sequence for PCB terminal blocks with contact pressure via insulating
material . 27
Figure 6 – Current cycling ageing test procedure .
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.