EN 60352-7:2002

SLOVENSKI STANDARD
01-oktober-2003
Solderless connections - Part 7: Spring clamp connections - General
requirements, test methods and practical guidance (IEC 60352-7:2002)
Solderless connections -- Part 7: Spring clamp connections - General requirements, test
methods and practical guidance
Lötfreie Verbindungen -- Teil 7: Federklemmverbindungen - Allgemeine Anforderungen,
Prüfverfahren und Anwendungshinweise
Connexions sans soudure -- Partie 7: Connexions à ressort - Règles générales,
méthodes d'essai et guide pratique
Ta slovenski standard je istoveten z: EN 60352-7:2002
ICS:
29.120.20 Spojni elementi Connecting devices
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60352-7
NORME EUROPÉENNE
EUROPÄISCHE NORM October 2002

ICS 31.220.10
English version
Solderless connections
Part 7: Spring clamp connections -
General requirements, test methods and practical guidance
(IEC 60352-7:2002)
Connexions sans soudure Lötfreie Verbindungen
Partie 7: Connexions à ressort - Teil 7: Federklemmverbindungen -
Règles générales, méthodes d'essai Allgemeine Anforderungen, Prüfverfahren
et guide pratique und Anwendungshinweise
(CEI 60352-7:2002) (IEC 60352-7:2002)

This European Standard was approved by CENELEC on 2002-10-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60352-7:2002 E
Foreword
The text of document 48B/1228/FDIS, future edition 1 of IEC 60352-7, prepared by SC 48B,
Connectors, of IEC TC 48, Electromechanical components and mechanical structures for electronic
equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 60352-7 on 2002-10-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-10-01
Annexes designated "normative" are part of the body of the standard.
In this standard, annex ZA is normative.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60352-7:2002 was approved by CENELEC as a European
Standard without any modification.
__________
- 3 - EN 60352-7:2002
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60050-581 1978 International Electrotechnical - -
A1 1998 Vocabulary (IEV)
Chapter 581: Electromechanical
components for electronic equipment

IEC 60068-1 1988 Environmental testing
+ corr. October 1988 Part 1: General and guidance
+ A1 1992 EN 60068-1 1994
IEC 60189-3 1988 Low-frequency cables and wires with - -
PVC insulation and PVC sheath
Part 3: Equipment wires with solid or
stranded conductor, PVC insulated, in
singles, pairs and triples
1)
IEC 60228 (mod) 1978 Conductors of insulated cables - First HD 383 S2 1986
A1 1993 supplement: Guide to the dimensional
limits of circular conductors
IEC 60512 Series Connectors for electronic equipment - EN 60512 Series
Tests and measurements
2) 3)
IEC 60512-1-100 - Connectors for electronic equipment - EN 60512-1-100 2001
Tests and measurements
Part 1-100: General - Applicable
publications
IEC 60884-1 1994 Plugs and socket-outlets for household - -
and similar purposes
Part 1: General requirements
1)
HD 383 S2 is based on IEC 60228:1978 + IEC 60228A:1982.
2)
Undated reference.
3)
Valid edition at date of issue.

NORME CEI
INTERNATIONALE IEC
60352-7
INTERNATIONAL
Première édition
STANDARD
First edition
2002-08
Connexions sans soudure –
Partie 7:
Connexions à ressort –
Règles générales, méthodes d'essai
et guide pratique
Solderless connections –
Part 7:
Spring clamp connections –
General requirements, test methods
and practical guidance
© IEC 2002 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch  Web: www.iec.ch
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Commission Electrotechnique Internationale PRICE CODE
International Electrotechnical Commission
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Pour prix, voir catalogue en vigueur
For price, see current catalogue

60352-7 © IEC:2003 – 3 –
CONTENTS
FOREWORD . 5
INTRODUCTION .7
1 Scope and object . 9
2 Normative references. 9
3 Definitions.11
4 Requirements .15
4.1 Workmanship.15
4.2 Tools .15
4.3 Spring-clamp terminations.15
4.4 Design features.15
4.5 Wires.15
4.6 Spring-clamp connections .17
5 Tests .17
5.1 Testing .17
5.2 Test methods and test requirements .19
5.3 Test schedules .33
6 Practical guidance.45
6.1 Current-carrying capacity .45
6.2 Tool information.45
6.3 Termination information .45
6.4 Wire information .47
6.5 Connection information .51
Figure 1 – Examples of spring-clamp connections.13
Figure 2 – Example of a spring-clamp terminal .13
Figure 3 – Information for the wire deflection test.25
Figure 4 – Test arrangement, vibration .25
Figure 5 – Test arrangement, current method .29
Figure 6 – Basic test schedule (see 5.3.2) .41
Figure 7 – Full test schedule (see 5.3.3) .43
Figure 8 – Correctly stripped wire .49
Figure 9 – Examples of stripping faults .49
Table 1 – Values of tensile strength .21
Table 2 – Values for wire deflection test.23
Table 3 – Vibration, test severities .27
Table 4 – Rated current of the wires, initial and final contact resistance .31
Table 5 – Number of specimens required.35

60352-7 © IEC:2003 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SOLDERLESS CONNECTIONS –
Part 7: Spring clamp connections – General requirements,
test methods and practical guidance
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60352-7 has been prepared by subcommittee 48B: Connectors, of
IEC technical committee 48: Electromechanical components and mechanical structures for
electronic equipment.
This bilingual version (2003-01) replaces the English version.
The text of this standard is based on the following documents:
FDIS Report on voting
48B/1228/FDIS 48B/1243/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
The French version of this standard has not been voted upon.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until 2007.
At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
60352-7 © IEC:2003 – 7 –
INTRODUCTION
This part of IEC 60352 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 require-
ments of clause 4. 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 4, for example which are manufactured using materials or finishes
not included in clause 4. 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 specification are minimum values, which are harmonized with other
IEC documents. Other standards may specify other values.

60352-7 © IEC:2003 – 9 –
SOLDERLESS CONNECTIONS –
Part 7: Spring clamp connections – General requirements,
test methods and practical guidance
1 Scope and object
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 telecommunication equipment and in
electronic devices employing similar techniques.
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 part of IEC 60352 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 standard may have a
negative environmental impact. As technological advances lead to acceptable alternatives for these materials, they
will be eliminated from this standard.
2 Normative references
The following referenced documents are indispensable for the application 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 60050(581):1978, International Electrotechnical Vocabulary (IEV) – Chapter 581: Electro-
mechanical components for electronic equipment
Amendment 1 (1998)
IEC 60068-1:1988, Environmental testing – Part 1: General and guidance
Amendment 1 (1992)
IEC 60189-3:1988, Low frequency cables and wires with PVC insulation and PVC sheath –
Part 3: Equipment wires with solid or stranded conductor, PVC insulated, in singles,
pairs and triples
IEC 60228:1978, Conductors of insulated cables
Amendment 1 (1993)
IEC 60512 (all parts), Connectors for electronic equipment – Tests and measurements

60352-7 © IEC:2003 – 11 –
IEC 60512-1-100, Connectors for electronic equipment – Tests and measurements – Part 1-100:
General – Applicable publications
IEC 60884-1:1994, Plug and socket-outlets for household and similar purposes – Part 1:
General requirements
3 Definitions
For the purpose of this part of IEC 60352, the terms and definitions of IEC 60050(581) and
IEC 60512-1 and the following additional terms and definitions apply:
3.1
spring-clamp termination
part of the contact or terminal to which one single conductor only is connected by means
of a spring
3.1.1
universal spring-clamp termination
spring-clamp termination intended to accept solid, stranded and flexible unprepared conductors
3.1.2
non-universal spring-clamp termination
spring-clamp termination intended to accept conductors of one class only, for example
solid conductors only, or conductors of two classes only, for example solid and stranded
but not flexible
3.1.3
push-in spring-clamp termination
non-universal spring-clamp termination in which the connection is made by pushing in a solid
or stranded conductor
3.2
spring-clamp connection
solderless connection achieved by clamping a conductor with a spring-clamp termination,
see figure 1
IEC  1988/02
Figure 1a – Spring-clamp connection, operated without a tool
IEC  1989/02
Figure 1b – Spring-clamp connection, operated with a tool

60352-7 © IEC:2003 – 13 –
IEC  1990/02
Figure 1c – Spring-clamp connection, operated with an actuating element
IEC  1991/02
Figure 1d – Spring-clamp connections, with a push-in
spring-clamp termination, with solid wires
Figure 1 – Examples of spring-clamp connections
3.3
spring-clamp terminal
terminal designed to accept a conductor for the purpose of establishing a spring-clamp
connection, see figure 2
IEC  1992/02
Figure 2 – Example of a spring-clamp terminal
3.4
spring-clamp connecting device
device for the electrical connection of one or more conductors comprising one or more spring-
clamp terminations and, if necessary, insulation and/or auxiliary parts
3.5
actuating element
part of a spring-clamp termination or terminal to which an external force is to be applied.
Movement of the actuating element provides a means for activating or deactivating the spring.
[IEV 581-11-09, modified]
60352-7 © IEC:2003 – 15 –
4 Requirements
4.1 Workmanship
The connection shall be processed in a careful and workmanlike manner, in accordance with
good current practice.
4.2 Tools
Tools, if necessary, shall be used and inspected according to the instructions given by the
manufacturer.
4.3 Spring-clamp terminations
4.3.1 Materials
– Materials for the current-carrying parts:
suitable grades of copper or copper alloy shall be used.
– Materials for the spring-clamp parts:
suitable grades of copper alloy or steel shall be used.
4.3.2 Surface finishes
The contact area of the current-carrying parts shall be plated with tin or tin-alloy.
The surface shall be free of detrimental contamination or corrosion.
4.4 Design features
Spring-clamp terminations shall be designed so that the spring-clamp parts establish a
sufficient force to produce a reliable connection.
In a spring-clamp connecting device, each conductor shall be clamped individually.
The openings for use of a tool intended to assist the insertion or withdrawal of the conductor
shall be clearly distinguishable from the conductors entry hole.
Dimensions
The suitability of a spring clamp connection depends on the dimensions of the termination
together with the characteristics of the materials used.
The dimensions shall be chosen so as to be suitable for the wire or the range of wires for which
the termination is designed.
The suitability is verified by applying the test schedules given in clause 5.
4.5 Wires
Wires with solid, stranded and flexible conductors according to IEC 60228 or IEC 60189-3 shall
be used depending on the type of spring-clamp terminations.
4.5.1 Materials
The conductor used shall be made of annealed copper.

60352-7 © IEC:2003 – 17 –
4.5.2 Dimensions
Wires with the following dimensions shall be used:
2 2
– solid wires of 0,32 mm to 3,7 mm nominal diameter (0,08 mm to 10 mm cross-section), or
2 2
– stranded wires of 0,08 mm to 10 mm cross-section, or
2 2
– flexible wires of 0,08 mm to 10 mm cross-section.
4.5.3 Surface finishes
The conductor shall be unplated or plated with tin or tin-alloy.
The conductor surface shall be free of contamination and corrosion which degrades
performance.
4.5.4 Wire insulation
The insulation shall be capable of being readily stripped from the conductor without changing
the physical characteristics of the conductor or strands.
4.6 Spring-clamp connections
a) The combination of wire and spring-clamp termination shall be compatible.
b) The wire shall be stripped to the correct length specified by the manufacturer. The stripped
part of the conductor shall not be damaged and shall be clean and free from particles
of insulation.
c) The conductor shall be correctly located in the spring-clamp termination at the correct
depth specified by the manufacturer.
All strands of the wire shall be within the spring-clamp termination.
5 Tests
5.1 Testing
5.1.1 General
As explained in the introduction, there are two test schedules which shall be applied according
to the following conditions:
– spring-clamp connections which conform to all the requirements of clause 4 shall be tested
in accordance with and meet the requirements of the basic test schedule, see 5.3.2;
– spring-clamp connections which do not fully conform to all the requirements of clause 4, for
example which are made with different wire types and/or termination sizes and/or materials,
shall be tested and meet the requirements of the full test schedule given in 5.3.3.
5.1.2 Standard conditions for testing
Unless otherwise specified, all tests shall be carried out under standard conditions for testing
as specified in IEC 60512-1.
The ambient temperature and the relative humidity at which the measurements are made shall
be stated in the test report.
60352-7 © IEC:2003 – 19 –
In case of dispute about test results, the test shall be repeated at one of the referred conditions
of IEC 60068-1.
5.1.3 Preconditioning
Where specified, the connections shall be preconditioned under standard conditions for testing
for a period of 24 h, in accordance with IEC 60512-1.
5.1.4 Recovery
Where specified, the specimen shall be allowed to recover under standard conditions for
testing for a period of 1 h to 2 h, after conditioning.
5.1.5 Mounting of specimen
a) When mounting is required in a test, the specimens shall be mounted using the normal
mounting method, unless otherwise specified.
b) Each test specimen shall consist of one spring-clamp connection prepared as required in
the test schedules.
NOTE When more test specimens are required, they may be part of the same multipole spring-clamp
connecting devices.
5.2 Test methods and test requirements
NOTE As far as test methods are described in this standard, it is intended that the description will be replaced by
a reference to the appropriate part of IEC 60512 as soon as the relevant test method is included in IEC 60512.
IEC 60512-1-100 contains a list of test methods and the relevant parts of the IEC 60512 series.
5.2.1 General examination
The examination shall be carried out in accordance with Test 1a: Visual examination, of
IEC 60512, and Test 1b: Examination of dimension and mass, of IEC 60512. The visual
examination test may be carried out with magnification up to approximately five times.
All spring-clamp terminations and wires shall be examined to ensure that the applicable
requirements of 4.3 to 4.6 have been met.
5.2.2 Mechanical tests
5.2.2.1 Tensile strength
The test shall be carried out in accordance with Test 16t: Mechanical strength (wired
terminations of solderless connections), method A, of IEC 60512.
Requirement:
The tensile strength of spring-clamp connections shall be not less than specified in table 1,
unless otherwise specified by the detail specification.

60352-7 © IEC:2003 – 21 –
Table 1 – Values of tensile strength
Conductor cross-section Values of tensile strength
mm N min.
≥0,08 4
0,22
0,34
0,5 20
0,75 30
1,0
1,5
2,5 50
4,0 60
6,0
10,0
5.2.2.2 Wire deflection
NOTE This test method is in accordance with the deflection test of IEC 60884-1.
Spring clamp terminations shall be so designed that the inserted solid conductor remains
clamped, even when the conductor has been deflected during normal installation, for example,
during mounting in a box, and the deflecting stress is transferred to the spring-clamp
termination.
Compliance is checked by the following test which is made on specimens which have not been
used for any other test.
a) Test apparatus
The test apparatus, the principle of which is shown in figure 3, shall be so constructed that:
– a specified conductor, properly inserted into a terminal, is allowed to be
...