IEC 60352-7:2020

Solderless connections - Part 7: Spring clamp connections - General requirements, test methods and practical guidance

IEC 60352-7:2020 is applicable to spring clamp connections made with stripped wire without further preparation:
- stranded conductors of 0,08 mm2 to 10 mm2 cross-section, or
- flexible conductors of 0,08 mm2 to 10 mm2 cross-section,
according to IEC 60228 or IEC 60189-3 for use in electrical and electronic equipment and components.
Information on materials and data from industrial experience is included in addition to the test procedures to provide electrically stable connections under prescribed environmental conditions. The object of this document is to determine the suitability of spring clamp connections under specified mechanical, electrical and atmospheric conditions. This second edition cancels and replaces the first edition of IEC 60352-7, published in 2002. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) correction of the two flow charts in Figure 6 and Figure 7,
b) split the content into more clauses for better separation between full test schedule and basic test schedule,
c) relocating the content of former Clause 6 Practical guidance into an informative Annex A, as now common in the IEC 60352 series for solderless connections,
d) clarification on conductor types with reference to classes defined in IEC 60228.

Connexions sans soudure - Partie 7: Connexions à ressort - Règles générales, méthodes d’essai et guide pratique

IEC 60352-7:2020 s’applique aux connexions à ressort réalisées avec du fil dénudé sans autre préparation:
– sur des âmes massives de 0,32 mm à 3,7 mm de diamètre nominal (section: 0,08 mm2 à 10 mm2), ou
– sur des âmes câblées de section: 0,08 mm2 à 10 mm2, ou
– sur des âmes souples de section: 0,08 mm2 à 10 mm2,
conformément à l’IEC 60228 ou l’IEC 60189-3, utilisées dans les équipements et composants électriques et électroniques.
Des informations sur les matières et des résultats provenant de l’expérience industrielle y sont inclus en supplément aux procédures d’essai, pour assurer des connexions électriquement stables dans les conditions d’environnement prescrites.
L’objet du présent document est de déterminer la conformité des connexions à ressort dans des conditions mécaniques, électriques et atmosphériques spécifiées.
Cette deuxième édition de l'IEC 60352-7 annule et remplace la première édition parue en 2003. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) correction des deux tableaux synoptiques représentés à la Figure 6 et à la Figure 7;
b) répartition du contenu selon un plus grand nombre de paragraphes pour une meilleure distinction entre programme d’essais complet et programme d’essais de base;
c) déplacement du contenu de l’ancien Article 6, Guide pratique, dans une Annexe A informative, comme il est désormais d’usage dans la série IEC 60352 pour les connexions sans soudure;
d) clarification des types d’âmes en faisant référence aux classes définies dans l’IEC 60228.
La présente version bilingue (2021-08) correspond à la version anglaise monolingue publiée en 2020-12.

General Information

• Status: Published
• Publication Date: 15-Dec-2020
• ICS: 31.220.10 - Plug-and-socket devices. Connectors
• Technical Committee: SC 48B - Electrical connectors
• Drafting Committee: WG 6 - TC 48/SC 48B/WG 6
• Current Stage: PPUB - Publication issued
• Start Date: 19-Jan-2021
• Completion Date: 16-Dec-2020

Relations

• Revises: IEC 60352-7:2002 - Solderless connections - Part 7: Spring clamp connections - General requirements, test methods and practical guidance
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60352-7 ®
Edition 2.0 2020-12
INTERNATIONAL
STANDARD
Solderless connections –
Part 7: Spring clamp connections – General requirements, test methods and
practical guidance
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.: [phone]
3, rue de Varembé [e-mail]
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
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IEC 60352-7 ®
Edition 2.0 2020-12
INTERNATIONAL
STANDARD
Solderless connections –
Part 7: Spring clamp connections – General requirements, test methods and

practical guidance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.220.10 ISBN 978-2-8322-9181-8

– 2 – IEC 60352-7:2020 © IEC:2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements . 10
4.1 Workmanship . 10
4.2 Tools . 10
5 Pre-requisites for basic test schedule . 10
5.1 Spring clamp terminations . 10
5.1.1 Materials . 10
5.1.2 Surface finishes . 11
5.1.3 Design features . 11
5.1.4 Dimensions . 11
5.2 Wires . 11
5.2.1 General . 11
5.2.2 Materials . 11
5.2.3 Dimensions . 11
5.2.4 Surface finishes . 11
5.2.5 Wire insulation . 12
5.3 Spring clamp connections . 12
6 Testing . 12
6.1 General . 12
6.2 Standard conditions for testing . 12
6.3 Preconditioning . 12
6.4 Recovery . 12
6.5 Mounting of specimen . 12
7 Tests . 13
7.1 General examination . 13
7.2 Mechanical tests . 13
7.2.1 Tensile strength . 13
7.2.2 Wire deflection. 13
7.2.3 Vibration . 16
7.2.4 Repeated connections and disconnections . 17
7.3 Electrical tests . 18
7.3.1 Contact resistance . 18
7.3.2 Electrical load and temperature . 19
7.4 Climatic tests . 19
7.4.1 General . 19
7.4.2 Rapid change of temperature . 19
7.4.3 Climatic sequence . 19
7.4.4 Flowing mixed gas corrosion test . 20
8 Test schedules . 20
8.1 General . 20
8.2 Basic test schedule . 21

8.2.1 General . 21
8.2.2 Initial examination . 21
8.2.3 Testing of spring clamp connections with spring clamp terminations with
and without a specified wire range . 21
8.3 Full test schedule . 22
8.3.1 General . 22
8.3.2 Initial examination . 22
8.3.3 Testing of spring clamp connections with and without a specified wire
range . 22
8.4 Flow charts . 23
Annex A (informative)  Practical guidance . 26
A.1 Current-carrying capacity . 26
A.2 Tool information . 26
A.3 Termination information . 26
A.3.1 General . 26
A.3.2 Design features . 26
A.3.3 Materials . 27
A.3.4 Surface finishes . 27
A.4 Wire information. 27
A.4.1 General . 27
A.4.2 Materials . 28
A.4.3 Surface finishes . 28
A.4.4 Stripping information . 28
A.5 Connection information . 29
Bibliography . 30

Figure 1 – Examples of spring clamp connections . 9
Figure 2 – Example of a spring clamp terminal . 10
Figure 3 – Information for the wire deflection test. 16
Figure 4 – Test arrangement, vibration . 17
Figure 5 – Test arrangement, current method . 18
Figure 6 – Basic test schedule (see 8.2) . 24
Figure 7 – Full test schedule (see 8.3) . 25
Figure A.1 – Correctly stripped wire . 28
Figure A.2 – Examples of stripping faults . 29

Table 1 – Values of tensile strength . 13
Table 2 – Value of force for wire deflection test . 15
Table 3 – Vibration, test severities . 17
Table 4 – Rated current of the wires, initial and final contact resistance . 19
Table 5 – Number of specimens required . 21
Table 6 – Test group P1 . 21
Table 7 – Test group P2 . 22
Table 8 – Test group A . 22
Table 9 – Test group B . 23
Table 10 – Test group C . 23
Table 11 – Test group D . 23

– 4 – IEC 60352-7:2020 © IEC:2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SOLDERLESS CONNECTIONS –
Part 7: Spring clamp connections – General requirements,
test methods and practical guidance

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwi
...

IEC 60352-7 ®
Edition 2.0 2020-12
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Solderless connections –
Part 7: Spring clamp connections – General requirements, test methods and

practical guidance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 31.220.10 ISBN 978-2-8322-9214-3

– 2 – IEC 60352-7:2020 RLV © IEC:2020
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope and object . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Requirements . 12
4.1 Workmanship . 12
4.2 Tools . 12
5 Pre-requisites for basic test schedule . 12
5.1 Spring clamp terminations . 12
5.1.1 Materials . 12
5.1.2 Surface finishes . 13
5.1.3 Design features . 13
5.1.4 Dimensions . 13
5.2 Wires . 13
5.2.1 General . 13
5.2.2 Materials . 13
5.2.3 Dimensions . 13
5.2.4 Surface finishes . 13
5.2.5 Wire insulation . 13
5.3 Spring clamp connections . 14
6 Tests Testing . 14
6.1 General . 14
Test methods and test requirements .
6.2 Standard conditions for testing . 14
6.3 Preconditioning . 14
6.4 Recovery . 14
6.5 Mounting of specimen . 14
7 Tests . 15
7.1 General examination . 15
7.2 Mechanical tests . 15
7.2.1 Tensile strength . 15
7.2.2 Wire deflection. 16
7.2.3 Vibration . 19
7.2.4 Repeated connections and disconnections . 20
7.3 Electrical tests . 21
7.3.1 Contact resistance . 21
7.3.2 Electrical load and temperature . 22
7.4 Climatic tests . 23
7.4.1 General . 23
7.4.2 Rapid change of temperature . 23
7.4.3 Climatic sequence . 23
7.4.4 Flowing mixed gas corrosion test . 23
8 Test schedules . 23
8.1 General . 23

8.2 Basic test schedule . 24
8.2.1 General . 24
8.2.2 Initial examination . 24
8.2.3 Testing of spring clamp connections with spring clamp terminations with
and without a specified wire range . 24
8.3 Full test schedule . 25
8.3.1 General . 25
8.3.2 Initial examination . 25
8.3.3 Testing of spring clamp connections with and without a specified wire
range . 25
8.4 Flow charts . 27
Annex A (informative) Practical guidance . 32
A.1 Current-carrying capacity . 32
A.2 Tool information . 32
A.3 Termination information . 32
A.3.1 General . 32
A.3.2 Design features . 32
A.3.3 Materials . 33
A.3.4 Surface finishes . 33
A.4 Wire information. 33
A.4.1 General . 33
A.4.2 Materials . 34
A.4.3 Surface finishes . 34
A.4.4 Stripping information . 34
A.5 Connection information . 35
Bibliography . 36

Figure 1 – Examples of spring clamp connections . 11
Figure 2 – Example of a spring clamp terminal . 12
Figure 3 – Information for the wire deflection test. 19
Figure 4 – Test arrangement, vibration . 20
Figure 5 – Test arrangement, current method . 21
Figure 6 – Basic test schedule (see 8.2) . 29
Figure 7 – Full test schedule (see 8.3) . 31
Figure A.1 – Correctly stripped wire . 34
Figure A.2 – Examples of stripping faults . 35

Table 1 – Values of tensile strength . 16
Table 2 – Values of force for wire deflection test . 18
Table 3 – Vibration, test severities . 20
Table 4 – Rated current of the wires, initial and final contact resistance . 22
Table 5 – Number of specimens required . 24
Table 6 – Test group P1 . 25
Table 7 – Test group P2 . 25
Table 8 – Test group A . 26
Table 9 – Test group B . 26
Table 10 – Test group C . 26

– 4 – IEC 60352-7:2020 RLV © IEC:2020
Table 11 – Test group D . 27

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SOLDERLESS CONNECTIONS –
Part 7: Spring clamp connections – General requirements,
test methods and practical guidance

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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...

IEC 60352-7 ®
Edition 2.0 2020-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Solderless connections –
Part 7: Spring clamp connections – General requirements, test methods and
practical guidance
Connexions sans soudure –
Partie 7: Connexions à ressort – Règles générales, méthodes d’essai et guide
pratique
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
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International Standards for all electrical, electronic and related technologies.

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IEC 60352-7 ®
Edition 2.0 2020-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Solderless connections –
Part 7: Spring clamp connections – General requirements, test methods and

practical guidance
Connexions sans soudure –
Partie 7: Connexions à ressort – Règles générales, méthodes d’essai et guide

pratique
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 31.220.10 ISBN 978-2-8322-9957-9

– 2 – IEC 60352-7:2020 © IEC:2020
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements . 10
4.1 Workmanship . 10
4.2 Tools . 10
5 Pre-requisites for basic test schedule . 10
5.1 Spring clamp terminations . 10
5.1.1 Materials . 10
5.1.2 Surface finishes . 11
5.1.3 Design features . 11
5.1.4 Dimensions . 11
5.2 Wires . 11
5.2.1 General . 11
5.2.2 Materials . 11
5.2.3 Dimensions . 11
5.2.4 Surface finishes . 11
5.2.5 Wire insulation . 12
5.3 Spring clamp connections . 12
6 Testing . 12
6.1 General . 12
6.2 Standard conditions for testing . 12
6.3 Preconditioning . 12
6.4 Recovery . 12
6.5 Mounting of specimen . 12
7 Tests . 13
7.1 General examination . 13
7.2 Mechanical tests . 13
7.2.1 Tensile strength . 13
7.2.2 Wire deflection. 13
7.2.3 Vibration . 16
7.2.4 Repeated connections and disconnections . 17
7.3 Electrical tests . 18
7.3.1 Contact resistance . 18
7.3.2 Electrical load and temperature . 19
7.4 Climatic tests . 19
7.4.1 General . 19
7.4.2 Rapid change of temperature . 19
7.4.3 Climatic sequence . 19
7.4.4 Flowing mixed gas corrosion test . 20
8 Test schedules . 20
8.1 General . 20
8.2 Basic test schedule . 21

8.2.1 General . 21
8.2.2 Initial examination . 21
8.2.3 Testing of spring clamp connections with spring clamp terminations with
and without a specified wire range . 21
8.3 Full test schedule . 22
8.3.1 General . 22
8.3.2 Initial examination . 22
8.3.3 Testing of spring clamp connections with and without a specified wire
range . 22
8.4 Flow charts . 23
Annex A (informative)  Practical guidance . 26
A.1 Current-carrying capacity . 26
A.2 Tool information . 26
A.3 Termination information . 26
A.3.1 General . 26
A.3.2 Design features . 26
A.3.3 Materials . 27
A.3.4 Surface finishes . 27
A.4 Wire information. 27
A.4.1 General . 27
A.4.2 Materials . 28
A.4.3 Surface finishes . 28
A.4.4 Stripping information . 28
A.5 Connection information . 29
Bibliography . 30

Figure 1 – Examples of spring clamp connections . 9
Figure 2 – Example of a spring clamp terminal
...