SIST EN IEC 60352-7:2021

Solderless connections - Part 7: Spring clamp connections - General requirements, test methods and practical guidance (IEC 60352-7:2020)

IEC 60352-7:2020 is available as IEC 60352-7:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC 60352-7:2020 is applicable to spring clamp connections made with stripped wire without further preparation:
- solid conductors of 0,32 mm to 3,7 mm nominal diameter (0,08 mm2 to 10 mm2 cross‑section), or
- 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.

Lötfreie Verbindungen - Teil 7: Federklemmverbindungen - Allgemeine Anforderungen, Prüfverfahren und Anwendungshinweise (IEC 60352-7:2020)

Connexions sans soudure - Partie 7: Connexions à ressort - Règles générales, méthodes d'essai et guide pratique (IEC 60352-7:2020)

IEC 60352-7:2020 est disponible sous forme de IEC 60352-7:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'�dition pr�c�dente.

Spoji brez spajke - 7. del: Objemka vzmetnih spojk - Splošne zahteve, preskusne metode in praktični napotki (IEC 60352-7:2020)

General Information

• Status: Published
• Publication Date: 15-Feb-2021
• ICS: 29.120.20 - Connecting devices
• ICS: 31.220.10 - Plug-and-socket devices. Connectors
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Feb-2021
• Due Date: 19-Apr-2021
• Completion Date: 16-Feb-2021
• Ref Project: EN IEC 60352-7:2021 - Solderless connections - Part 7: Spring clamp connections - General requirements, test methods and practical guidance

Relations

• Revised: SIST EN 60352-7:2003 - Solderless connections -- Part 7: Spring clamp connections - General requirements, test methods and practical guidance
• Effective Date: 14-Jan-2020
• Replaces: SIST EN 60352-7:2003 - Solderless connections -- Part 7: Spring clamp connections - General requirements, test methods and practical guidance
• Effective Date: 09-Feb-2021

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 60352-7:2021
01-april-2021
Nadomešča:
SIST EN 60352-7:2003
Spoji brez spajke - 7. del: Objemka vzmetnih spojk - Splošne zahteve, preskusne
metode in praktični napotki (IEC 60352-7:2020)
Solderless connections - Part 7: Spring clamp connections - General requirements, test
methods and practical guidance (IEC 60352-7:2020)
Lötfreie Verbindungen - Teil 7: Federklemmverbindungen - Allgemeine Anforderungen,
Prüfverfahren und Anwendungshinweise (IEC 60352-7:2020)
Connexions sans soudure - Partie 7: Connexions à ressort - Règles générales,
méthodes d'essai et guide pratique (IEC 60352-7:2020)
Ta slovenski standard je istoveten z: EN IEC 60352-7:2021
ICS:
29.120.20 Spojni elementi Connecting devices
SIST EN IEC 60352-7:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 60352-7:2021

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SIST EN IEC 60352-7:2021


EUROPEAN STANDARD EN IEC 60352-7

NORME EUROPÉENNE

EUROPÄISCHE NORM
February 2021
ICS 31.220.10 Supersedes EN 60352-7:2002 and all of its amendments
and corrigenda (if any)
English Version
Solderless connections - Part 7: Spring clamp connections -
General requirements, test methods and practical guidance
(IEC 60352-7:2020)
Connexions sans soudure - Partie 7: Connexions à ressort - Lötfreie Verbindungen - Teil 7: Federklemmverbindungen -
Règles générales, méthodes d'essai et guide pratique Allgemeine Anforderungen, Prüfverfahren und
(IEC 60352-7:2020) Anwendungshinweise
(IEC 60352-7:2020)
This European Standard was approved by CENELEC on 2021-01-20. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 60352-7:2021 E

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SIST EN IEC 60352-7:2021
EN IEC 60352-7:2021 (E)
European foreword
The text of document 48B/2823/CDV, future edition 2 of IEC 60352-7, prepared by SC 48B "Electrical
connectors" of IEC/TC 48 "Electrical connectors and mechanical structures for electrical and electronic
equipment" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
EN IEC 60352-7:2021.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2021-10-20
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2024-01-20
document have to be withdrawn
This document supersedes EN 60352-7:2002 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Endorsement notice
The text of the International Standard IEC 60352-7:2020 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60512-1-100 NOTE Harmonized as EN 60512-1-100
IEC 60512-9-5 NOTE Harmonized as EN IEC 60512-9-5
IEC 60947-7-1:2009 NOTE Harmonized as EN 60947-7-1:2009 (not modified)


2

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SIST EN IEC 60352-7:2021
EN IEC 60352-7:2021 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60068-1 2013 Environmental testing - Part 1: General EN 60068-1 2014
and guidance
IEC 60189-3 2007 Low-frequency cables and wires with PVC - -
insulation and PVC sheath - Part 3:
Equipment wires with solid or stranded
conductor wires, PVC insulated, in singles,
pairs and triples
IEC 60228 2004 Conductors of insulated cables EN 60228 2005
- -  + corrigendum May 2005
IEC 60512-1 -  Connectors for electrical and electronic EN IEC 60512-1 -
equipment - Tests and measurements -
Part 1: Generic specification
IEC 60512-1-1 -  Connectors for electronic equipment - EN 60512-1-1 -
Tests and measurements - Part 1-1:
General examination - Test 1a: Visual
examination
IEC 60512-1-2 -  Connectors for electronic equipment - EN 60512-1-2 -
Tests and measurements - Part 1-2:
General examination - Test 1b:
Examination of dimension and mass
IEC 60512-2-1 -  Connectors for electronic equipment - EN 60512-2-1 -
Tests and measurements - Part 2-1:
Electrical continuity and contact resistance
tests - Test 2a: Contact resistance -
Millivolt level method
IEC 60512-2-2 -  Connectors for electronic equipment - EN 60512-2-2 -
Tests and measurements - Part 2-2:
Electrical continuity and contact resistance
tests - Test 2b: Contact resistance -
Specified test current method
3

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SIST EN IEC 60352-7:2021
EN IEC 60352-7:2021 (E)
Publication Year Title EN/HD Year
IEC 60512-2-5 -  Connectors for electronic equipment - EN 60512-2-5 -
Tests and measurements - Part 2-5:
Electrical continuity and contact resistance
tests - Test 2e: Contact disturbance
IEC 60512-6-4 -  Connectors for electronic equipment - EN 60512-6-4 -
Tests and measurements - Part 6-4:
Dynamic stress tests - Test 6d: Vibration
(sinusoidal)
IEC 60512-9-2 -  Connectors for electronic equipment - EN 60512-9-2 -
Tests and measurements - Part 9-2:
Endurance tests - Test 9b: Electrical load
and temperature
IEC 60512-11-1 -  Connectors for electrical and electronic EN IEC 60512-11-1 -
equipment - Tests and measurements -
Part 11-1: Climatic tests - Test 11a -
Climatic sequence
IEC 60512-11-4 -  Connectors for electronic equipment - EN 60512-11-4 -
Tests and measurements - Part 11-4:
Climatic tests - Test 11d: Rapid change of
temperature
IEC 60512-11-7 -  Connectors for electronic equipment - EN 60512-11-7 -
Tests and measurements - Part 11-7:
Climatic tests - Test 11g: Flowing mixed
gas corrosion test
IEC 60512-16-20 -  Electromechanical components for EN 60512-16-20 -
electronic equipment - Basic testing
procedures and measuring methods - Part
16: Mechanical tests on contacts and
terminations - Section 20: Test 16t:
Mechanical strength (wired termination of
solderless connections)


4

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SIST EN IEC 60352-7:2021



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




  Warning! Make sure that you obtained this publication from an authorized distributor.


® Registered trademark of the International Electrotechnical Commission

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SIST EN IEC 60352-7:2021
– 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

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SIST EN IEC 60352-7:2021
IEC 60352-7:2020 © IEC:2020 – 3 –
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

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SIST EN IEC 60352-7:2021
– 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 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 should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60352-7 has been prepared by subcommittee SC 48B: Electrical
connectors, of IEC technical committee 48: Electrical connectors and mechanical structures
for electrical and electronic equipment.
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,

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SIST EN IEC 60352-7:2021
IEC 60352-7:2020 © IEC:2020 – 5 –
d) clarification on conductor types with reference to classes defined in IEC 60228.
The text of this International Standard is based on the following documents:
FDIS Report on voting
48B/2823/CDV 48B/2851/RVC

Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
This document was drafted in accordance with ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60352 series, published under the general title Solderless
connections, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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SIST EN IEC 60352-7:2021
– 6 – IEC 60352-7:2020 © IEC:2020
INTRODUCTION
This part of IEC 60352 covers spring clamp connections and includes requirements, tests and
practical guidance information.
Two test schedules are provided.
a) The basic test schedule applies to spring clamp connections which conform to all
requirements of Clause 5. These requirements are derived from experience with
successful applications of such spring clamp connections.
b) The full test schedule applies to spring clamp connections which do not fully conform to all
requirements of Clause 5, for example which are manufactured using materials or finishes
not included in Clause 5.
This approach permits cost and time effective performance verification using a limited basic
test schedule for established spring clamp connections and an expanded full test schedule for
spring clamp connections requiring more extensive performance validation.
The values given in this document are minimum values, which are harmonized with other IEC
documents. Other standards may specify other values.

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SIST EN IEC 60352-7:2021
IEC 60352-7:2020 © IEC:2020 – 7 –
SOLDERLESS CONNECTIONS –

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



1 Scope
This part of IEC 60352 is applicable to spring clamp connections made with stripped wire
without further preparation:
2 2
– solid conductors of 0,32 mm to 3,7 mm nominal diameter (0,08 mm to 10 mm
cross‑section), or
2 2
– stranded conductors of 0,08 mm to 10 mm cross-section, or
2 2
– flexible conductors of 0,08 mm to 10 mm 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.
NOTE IEC Guide 109 advocates the need to minimize the impact of a product on the natural environment
throughout the product life cycle. It is understood that some of the materials permitted in this document can have a
negative environmental impact. As technological advances lead to acceptable alternatives for these materials, they
will be eliminated from this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60189-3:2007, Low-frequency cables and wires with PVC insulation and PVC sheath –
Part 3: Equipment wires with solid or stranded conductor wires, PVC insulated, in singles,
pairs and triples
IEC 60228:2004, Conductors of insulated cables
IEC 60512-1, Connectors for electrical and electronic equipment – Tests and measurements –
Part 1: Generic specification
IEC 60512-1-1, Connectors for electronic equipment – Tests and measurements – Part 1-1:
General examination – Test 1a: Visual examination
IEC 60512-1-2, Connectors for electronic equipment – Tests and measurements – Part 1-2:
General examination – Test 1b: Examination of dimension and mass

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IEC 60512-2-1, Connectors for electronic equipment – Tests and measurements – Part 2-1:
Electrical continuity and contact resistance tests – Test 2a: Contact resistance – Millivolt level
method
IEC 60512-2-2, Connectors for electronic equipment – Tests and measurements – Part 2-2:
Electrical continuity and contact resistance tests – Test 2b: Contact resistance – Specified
test current method
IEC 60512-2-5, Connectors for electronic equipment – Tests and measurements – Part 2-5:
Electrical
...