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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
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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
...