EN 60352-1:1997

Solderless connections - Part 1: Wrapped connections - General requirements, test methods and practical guidance

Determines the suitability of wrapped connections under specified mechanical, electrical and atmospheric conditions, and provides a means of comparing test results when the tools used to make the connections are of different design.

Lötfreie Verbindungen - Teil 1: Wickelverbindungen - Allgemeine Anforderungen, Prüfverfahren und Anwendungshinweise

Connexions sans soudure - Partie 1: Connexions enroulées - Règles générales, méthodes d'essai et guide pratique

Détermine la conformité des connexions enroulées dans des conditions mécaniques, électriques et atmosphériques spécifiées. Fournit un moyen de comparaison des résultats d'essai quand les outils utilisés pour faire les connexions sont de conception différente.

Solderless connections - Part 1: Wrapped connections - General requirements, test methods and practical guidance (IEC 60352-1:1997)

General Information

• Status: Published
• Publication Date: 31-Dec-1997
• Withdrawal Date: 30-Jun-1998
• ICS: 29.120.20 - Connecting devices
• Technical Committee: CLC/SR 48B - Connectors
• Drafting Committee: IEC/SC 48B - IEC_SC_48B
• Parallel Committee: IEC/SC 48B - IEC_SC_48B
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 15-Oct-1997
• Completion Date: 15-Oct-1997
• Ref Project: SIST EN 60352-1:2002 - Solderless connections -- Part 1: Wrapped connections - General requirements, test methods and practical guidance

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60352-1:2002
01-september-2002
Solderless connections - Part 1: Wrapped connections - General requirements,
test methods and practical guidance (IEC 60352-1:1997)

Solderless connections -- Part 1: Wrapped connections - General requirements, test

methods and practical guidance
Lötfreie Verbindungen -- Teil 1: Wickelverbindungen - Allgemeine Anforderungen,
Prüfverfahren und Anwendungshinweise
Connexions sans soudure -- Partie 1: Connexions enroulées - Règles générales,
méthodes d'essai et guide pratique
Ta slovenski standard je istoveten z: EN 60352-1:1997
ICS:
29.120.20 Spojni elementi Connecting devices
SIST EN 60352-1:2002 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60352-1:2002
---------------------- Page: 2 ----------------------
SIST EN 60352-1:2002
---------------------- Page: 3 ----------------------
SIST EN 60352-1:2002
---------------------- Page: 4 ----------------------
SIST EN 60352-1:2002
---------------------- Page: 5 ----------------------
SIST EN 60352-1:2002
---------------------- Page: 6 ----------------------
SIST EN 60352-1:2002
NORME
CEI
INTERNATIONALE
IEC
60352-1
INTERNATIONAL
Troisième édition
STANDARD
Third edition
1997-08
Connexions sans soudure –
Partie 1:
Connexions enroulées –
Règles générales, méthodes d'essai
et guide pratique
Solderless connections –
Part 1:
Wrapped connections –
General requirements, test methods
and practical guidance
 IEC 1997 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

utilisée sous quelque forme que ce soit et par aucun any form or by any means, electronic or mechanical,

procédé, électronique ou mécanique, y compris la photo- including photocopying and microfilm, without permission in

copie et les microfilms, sans l'accord écrit de l'éditeur. writing from the publisher.

International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: [phone] e-mail: [e-mail] IEC web site http: //www.iec.ch
CODE PRIX
Commission Electrotechnique Internationale
PRICE CODE
International Electrotechnical Commission
Pour prix, voir catalogue en vigueur
For price, see current catalogue
---------------------- Page: 7 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 3 –
CONTENTS
Page

FOREWORD ................................................................................................................................... 5

INTRODUCTION............................................................................................................................. 7

Clause

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 Posts ............................................................................................................................... 17

4.4 Wrapping wires................................................................................................................ 25

4.5 Wrapped connections ..................................................................................................... 27

5 Tests......................................................................................................................................... 31

5.1 Testing............................................................................................................................. 31

5.2 Type tests........................................................................................................................ 31

5.3 Test schedules ................................................................................................................ 37

6 Practical guidance.................................................................................................................... 47

6.1 Current-carrying capacity ................................................................................................47

6.2 Tool information............................................................................................................... 47

6.3 Post information .............................................................................................................. 51

6.4 Wire information.............................................................................................................. 59

6.5 Connection information ...................................................................................................61

---------------------- Page: 8 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
SOLDERLESS CONNECTIONS –
Part 1: Wrapped 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 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 60352-1 has been prepared by subcommittee 48B: Connectors, of

IEC technical committee 48: Electromechanical components and mechanical structures for

electronic equipment.

This third edition cancels and replaces the second edition published in 1983, of which it

constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
48B/590/FDIS 48B/635/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 contents of the corrigendum of October 1998 have been included in this copy.
---------------------- Page: 9 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 7 –
INTRODUCTION

This part of IEC 60352 includes requirements, tests and practical guidance information.

Two test schedules are provided.

The basic test schedule applies to wrapped connections which conform to all the requirements

of clause 4.

These requirements are derived from experience with successful applications of such wrapped

connections.

The full test schedule applies to wrapped connections which do not fully conform to all the

requirements of clause 4, for example those 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 wrapped connections and an expanded full test schedule for

wrapped connections requiring more extensive performance validation.
---------------------- Page: 10 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 9 –
SOLDERLESS CONNECTIONS –
Part 1: Wrapped connections –
General requirements, test methods and practical guidance
1 Scope and object

This part of IEC 60352 is applicable to wrapped connections made with single solid round wires

with nominal diameters of 0,16 mm minimum and appropriately designed posts for use in

telecommunications equipment and in electronic devices employing similar techniques.

Information on materials and data from industrial experience are included in addition to the test

procedures to provide electrically stable connections under prescribed environmental conditions.

The object of this standard is to determine the suitability of wrapped connections under

specified mechanical, electrical and atmospheric conditions, and to provide a means of

comparing test results when the tools used to make the connections are of different design or

manufacture.
2 Normative references

The following normative documents contain provisions which, through reference in this text,

constitute provisions of this part of IEC 60352. At the time of publication, the editions indicated

were valid. All normative documents are subject to revision, and parties to agreements based

on this part of IEC 60352 are encouraged to investigate the possibility of applying the most

recent editions of the normative documents indicated below. Members of IEC and ISO maintain

registers of currently valid International Standards.

IEC 60050(581): 1978, International Electrotechnical Vocabulary (IEV) – Chapter 581: Electro-

mechanical components for electronic equipment
IEC 60068-1: 1988, Environmental testing – Part 1: General and guidance
Amendment 1 (1992)

IEC 60352-5: 1995, Solderless connections – Part 5: Solderless press-in connections –

General requirements, test methods and practical guidance

IEC 60512-1: 1994, Electromechanical components for electronic equipment – Basic testing

procedures and measuring methods – Part 1: General

IEC 60512-2: 1985, Electromechanical components for electronic equipment; basic testing

procedures and measuring methods – Part 2: General examination, electrical continuity and

contact resistance tests, insulation tests and voltage stress tests
Amendment 1 (1994)

IEC 60512-6: 1984, Electromechanical components for electronic equipment; basic testing

procedures and measuring methods – Part 6: Climatic tests and soldering tests

IEC 60512-8: 1993, Electromechanical components for electronic equipment; basic testing

procedures and measuring methods – Part 8: Connector tests (mechanical) and mechanical

tests on contacts and terminations
IEC 60979: 1989, Wires for wire wrapping applications

ISO 468: 1982, Surface roughness – Parameters, their values and general rules for specifying

requirements

ISO 1337: 1980, Wrought coppers (having minimum copper contents of 99,85 %) – Chemical

composition and forms of wrought products

ISO 6507-1: 1982, Metallic materials – Hardness test – Vickers test – Part 1: HV 5 to HV 100

---------------------- Page: 11 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 11 –
3 Definitions

For the purpose of this part of IEC 60352, the terms and definitions included in IEC 60050(581)

and IEC 60512-1 and the following additional terms and definitions apply.

3.1 wrap post: A termination generally rectangular with sharp corners made to accept a

wrapped connection. [IEV 581-03-34, modified]
NOTE – In this standard, the term "wrap post" is shortened to "post".

3.2 wrapped connection: A solderless connection achieved by wrapping a solid conductor

around a wrap post (see figure 1). [IEV 581-03-10, modified]
IEC 1 019/97
Figure 1 – Wrapped connection

3.3 conventional wrapped connection: A solderless connection achieved by wrapping a

solid conductor around a wrap post without any contact of the wire insulation to the post (see

figure 2a). [IEV 581-03-45]

3.4 modified wrapped connection: A solderless connection achieved by wrapping a solid

conductor around a wrap post with the wire insulation wrapped around at least three corners of

the post (see figure 2b). [IEV 581-03-44]

3.5 turn of wire: A single helical ring of wire wrapped 360° around a wrap post. [IEV 581-03-65]

3.6 reference corner: That corner of the wrap post at which the stripped wire makes

its first indentation and from which the number of wrapped turns is counted (see figure 2).

[IEV 581-03-38]
---------------------- Page: 12 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 13 –
IEC 1 020/97 IEC 1 021/97
Figure 2a – Conventional Figure 2b – Modified
wrapped connection wrapped connection
Figure 2 – Reference corner
---------------------- Page: 13 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 15 –

3.7 end tail: The final portion of the last turn of wire in a wrapped connection which extends

beyond the last corner of contact (see figure 3). [IEV 581-03-54]
Figure 3 – End tail

3.8 gas-tight area: The part of the contact area that is not affected by gases under specified

conditions (see figure 1). [IEV 581-03-64]

3.9 stripping force: The force applied to the wrapped connection along the major axis of the

post which breaks the gas-tight areas. [IEV 581-03-55]

NOTE – The gas-tight areas are broken by the initial movement of the connection along the post.

3.10 effective wrapping length: That portion of a wrap post suitable and available for the

application of the wrapped connection for which all requirements are fixed. [IEV 581-03-60]

3.11 total post length: The length of a post from the mounting plane to the tip. [IEV 581-03-61]

3.12 hoop stress: The tension in the wire induced by the wrapping operation and maintained

by the wire being locked on the corners of the post. [IEV 581-03-50]
4 Requirements
4.1 Workmanship

The connections shall be processed in a careful and workmanlike manner, in accordance with

good current practice.
4.2 Tools

Tools shall be used and inspected according to the instructions given by the manufacturer.

4.2.1 Wrapping tools

The wrapping tool shall be capable of making uniformly reliable connections during its lifetime.

It shall also make a neat closure of the last turn, without causing undue mutilation of the

wrapping wire or post. The hole in the bit shall have a depth sufficient to accommodate the

total length of the post (see 6.2.1 and 6.3.5.3).

Tools are evaluated by testing wrapped connections made with the tools to be evaluated.

4.2.2 Unwrapping tools

Unwrapping tools shall not damage the post and shall completely remove the unwrapped wire

from the post (see 6.2.2).
---------------------- Page: 14 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 17 –
4.3 Posts
4.3.1 Materials

Copper alloys with Vickers hardness of 95 HV 5 to 220 HV 5 when tested in accordance with

ISO 6507-1 shall be used. Suitable alloys are brass, phosphor bronze, nickel-silver. When the

hardness of the post is to be measured and Vickers hardness cannot be used due to the size

of the indent, another suitable method such as diamond pyramid hardness or Knoop hardness

may be used.

NOTE – The hardness range 95 HV 5 to 120 HV 5 is mainly used for busbars incorporating wrap posts.

4.3.2 Cross-section
Table 1 lists 11 groups of post sizes and the relevant wire sizes for each.
Table 1 – Post and wire sizes
Post size Wire size
Nominal conductor diameter
Diagonal Preferred
group (nominal)
0,16 0,26 0,32 0,4 0,5 0,65 0,8 1,0
sizes
Maximum insulation diameter
mm mm
0,27 0,7 0,9 1,17 1,27 1,32 1,5 1,78
0,41 – 0,431 Mod. / / / / / /
0,3 × 0,3
0,46 – 0,51 Mod. Mod. / / / / / /
0,4 × 0,4
0,5 – 0,565 Mod. Mod. / / / / / /
0,4 × 0,4
0,69 – 0,77 / Mod. / / / /
0,5 × 0,5
0,76 – 0,86 / Mod. Mod. Mod. // / /
0,6 × 0,6
or Con.
0,77 – 0,825 / Mod. Mod. Mod. // / /
0,635 × 0,635
or Con.
0,84 – 0,91 / Mod. Mod. Mod. // / /
0,635 × 0,635
or Con.
0,95 – 1,20 / Mod. Mod. Mod. // /
0,8 × 0,8
or Con.
1,35 – 1,78 / Mod. Mod. Mod. Mod. /
1,0 × 1,0
or Con. or Con. or Con. or Con.
0,8 × 1,4
0,8 × 1,6
1,6 – 1,86 / Mod. Mod. Mod. Mod. Mod.
1,2 × 1,2
or Con. or Con. or Con. or Con. or Con.
1,2 × 1,4
2,3 – 2,9 // // Mod. Mod. /
0,8 × 2,4
or Con. or Con.
NOTE – Mod. = modified wrapped connection.
Con. = conventional wrapped connection.
/ = wrapped connection is not possible or not permitted.

Blank = wrapped connection might be applied but the relevant combination of dimensions is neither

recommended nor widely used.
For the permitted maximum insulation diameter, see 6.3.6.
The relevant tool (bit) shall be chosen by the user.

This diagonal group refers to chamfered posts, i.e. two corners of the post are chamfered, the other two are

in accordance with 4.3.7.
---------------------- Page: 15 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 19 –
4.3.3 Tolerance on post sizes

The dimensions of the post shall be such that the limits of the diagonals given in table 1 are

met. The diagonals include the effect of corner radii and burrs. The tolerance on post sizes

shall comply with the relevant detail specification for the component.

NOTE – Because posts are accommodated by round holes in the wrapping bits, it is necessary that their

diagonals be within acceptable limits. Several cross-sections may fall into a diagonal range, but the tolerance

on the diagonal is more important than the width and the thickness, or the tolerances thereon.

4.3.4 Length

The length of the post shall be as specified in the relevant detail specification.

NOTE – It is considered desirable for the effective wrapping length of the post to be capable of accommodating

up to three wrapped connections (see 6.3.5).
4.3.5 Parallelism

All posts shall have corners which are parallel within 0,05 mm per 10 mm over the entire

effective wrapping length.
4.3.6 Straightness

The posts shall be free from bends and bows which might restrict the free entry of the post into

the hole of the wrapping bit.
4.3.7 Corner radii

At any part of the post at least two of the corners shall meet the requirements of table 2 after

application of the surface finish.
Table 2 – Corner radii
Diagonals Corner radii
(max.)
mm mm
<0,6 0,025
0,6 – 1,3 0,05
>1,3 0,08
4.3.7.1 Corner radius verification

The corner radii shall be verified by comparing a magnified shadowgraph of the post under test

with an optical gauge as defined by figure 4.

A cross-section shadowgraph of the post under test shall be prepared using a minimum

magnification of 50 times.

A glass master as defined by figure 4 shall be prepared as an optical gauge. The radius value r

shall be chosen in accordance with the dimensions of table 2.

NOTE – For the glass master, the radius r of table 2 is multiplied by the magnification factor of the shadow-

graph.
---------------------- Page: 16 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 21 –

The shadowgraph of the post under test shall be placed upon the optical gauge so that the

flattest side of the shadowgraph is located on the datum line and the other side of the corner to

be tested passes through the datum point.
Requirements:

a) the side passing through the datum point shall be within the angular limits (2);

b) the corner shall be within the area (1) defined by the optical gauge.

If the corner is located in area (3), the conditions of 4.3.8 shall be fulfilled additionally.

NOTE – An example of a good radius is given in figure 5.
IEC 1 022/97
Figure 4 – Glass master Figure 5 – Example of a good radius
4.3.8 Corner burrs

Burrs shall not exceed the following values after application of the surface finish (table 3).

Table 3 – Corner burrs
Diagonals Corner burrs
(max.)
mm mm
<0,6 0,02
0,6 – 1,3 0,02
>1,3 0,05
4.3.9 Shape of tip

The tip of the post shall be tapered or bevelled (see figure 6) to facilitate insertion into the

wrapping bit.

Where the post is intended to be used with automatic or semi-automatic wiring machines using

fixed tools, the following dimensions (table 4) shall apply in both axes.
---------------------- Page: 17 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 23 –
Table 4 – Shape of tip
Diagonals c
max. min.
mm mm mm
<0,6 rounded or pointed
0,6 – 1,3 0,25 0,05
>1,3 0,4 0,05
NOTE – For the length of the tip, see table 13.
IEC 1 023/97
Figure 6 – Shape of tip
4.3.10 Mounting

Posts shall be securely mounted so that they can withstand the force and torque likely to be

encountered during the wrapping action. The mounting of the post shall withstand the axial

force specified in table 5 in the direction in which the tool is applied. The mounting of the post

shall withstand the torque specified in table 5.
Table 5 – Mounting strength
Diagonals Axial force Torque
mm N Nm
<0,44 25 0,02
0,44 – 1,3 30 0,02
>1,3 40 0,06
---------------------- Page: 18 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 25 –

Where the post is intended to be used with automatic or semi-automatic wiring machines using

fixed tools, the following conditions shall apply:

– the basis of all assembled posts within a panel shall be flat and straight within 0,3 mm;

– the mounting dimensions shown in table 6 shall be used.
IEC 1 024/97
Figure 7 – True position tolerance zone
Table 6 – Mounting tolerances
True position tolerance zone
Diagonals z y
mm mm mm
<0,6
≤0,5
0,6 – 1,3 y = z
≤0,5
>1,3
≤0,8
The position tolerance might be restricted by the detail specification
or in other applications, for example press-in terminations (see
IEC 60352-5).
4.4 Wrapping wires

Only single solid round wires in accordance with IEC 60979 shall be used as wrapping wires;

stranded conductors are not permissible. Stable connections can be made with a range of wire

materials and diameters and using appropriate tools.
---------------------- Page: 19 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 27 –
4.4.1 Conductor materials
The conductor shall be as specified in table 7.
Table 7 – Conductor materials
Nominal conductor Material Elongation
diameter at break
mm %
Copper alloy
≤0,4 ≥7
Oxygen free copper (Cu – OF)
≤0,5 ≥15
according to ISO 1337
>0,5 Copper
≥20

When connections are to operate for long periods at temperatures exceeding 90 °C, the wrapping

wire shall be of a suitable material less susceptible than copper to stress relaxation at elevated

temperatures. The elongation characteristics of such wires may be different from those of fully

annealed copper wires.
4.4.2 Conductor finish

The conductor finish shall be silver, tin, tin alloy or unplated. Its surface shall be free of

contamination and corrosion.
4.4.3 Diameter

The diameter of the conductor shall be within the range of 0,16 mm to 1,0 mm nominal. For the

relation between conductor diameter and post sizes, see table 1.
4.4.4 Insulation

The insulation shall be capable of being readily stripped from the conductor without changing

the physical characteristic of the wire. For a modified wrapped connection, the insulation shall

have sufficient wall thickness (generally in excess of 40 % of the conductor diameter).

The producer of the wrapped connections shall establish the compatibility between the outside

diameter of the wire and the wrapping bit designed for wrapping modified wrapped connections.

4.5 Wrapped connections
4.5.1 General
a) The combination of tool, post and wire shall be compatible.

b) The wire turns shall be closely wound and shall not overlap one another. A possible gap

between adjacent turns shall be not more than one-half the nominal diameter of the

conductor. The sum of all gaps except those of the first and last turns shall not exceed one

diameter of the conductor (see figure 15, figure 16 and table 13).

c) A connection once made shall not be disturbed, and there shall be no attempt to tidy up

the ends, or "tighten" the connection with pliers, etc. If necessary, the end tail may be

closed in, but only using the wrapping tool.
---------------------- Page: 20 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 29 –
d) The wrapped connection shall be entirely on the effective wrapping length.

e) Adjacent connections made on the same post, wrapped in the same direction, may touch

each other but there shall be no overlapping between adjacent connections (see figure 15,

figure 16 and table 13).

NOTE – It is considered desirable for the effective wrapping length to be capable of accommodating up to three

wrapped connections.
4.5.2 Conventional wrapped connection

For conventional wrapped connections, the minimum number of turns shall be as specified in

table 8. The insulation shall start as close as possible to the post to avoid short circuits to

adjacent wrapped connections or conductors.
4.5.3 Modified wrapped connection

Modified wrapped connections shall always be used for conductor nominal diameters of

0,32 mm or less (see table 1).

The minimum number of turns of stripped wires shall be as specified in table 8. The part of the

wrapped wire with insulation shall envelop at least three corners of the post.
Table 8 – Minimum number of turns of stripped wires
Nominal conductor
Minimum number of turns of stripped wires
diameter
(see table 1)
mm Annealed copper Copper alloy or
equivalents
0,16 8 8
0,26 7 5
0,32 7 5
0,4 6 5
0,5 5 4
0,65 4 4
0,8 4 4
1,0 4 3
4.5.4 Rewrapping of connections

To disconnect a wrapped connection, the wrapped wire shall be carefully uncoiled by a suitable

tool and not stripped off, to preserve the corners of the post for a new wrapped connection.

NOTE – An example of a suitable tool is shown in figure 14.

The rewrapping of that portion of a conductor which has been previously wrapped on a post,

then unwrapped, is not permissible. However, it is permissible to wrap a new connection on a

post on which a connection has been previously wrapped, provided that the post and the

connection are capable of meeting the requirements specified herein.

NOTE – Posts with a diagonal up to and including 1,3 mm may be rewrapped at least five times and posts with a

diagonal above 1,3 mm may be rewrapped at least ten times.
---------------------- Page: 21 ----------------------
SIST EN 60352-1:2002
60352-1 © IEC:1997 – 31 –
4.5.5 Combinations of soldered connections and wrapped connections

Soldered and solderless wrapped connections on a common post should be avoided, but,

where unavoidable, they shall be as far apart from each other as possible and solder shall not

spread onto the wrapped connection.

Precautions shall be taken to avoid damage to adjacent wrapped connections during the

soldering process.

NOTE – It is advisable to solder all adjacent connections on a common post if one soldered connection is made.

5 Tests
5.1 Testing
5.1.1 General

As explained in the introduction, there are two test schedules which are applied according to

the following conditions:

– wrapped 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;

– wrapped connections which conform to all the requirements of clause 4 except for the size

or material of the wrapping wire or the post shall be tested in accordance with and meet the

requirements of the full test schedule, see 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.

In case of dispute about test results, the test shall be repeated at one of the referee 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 specimens 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 specimens

When mounting is required in a test, the specimens shall be mounted using the normal

mounting method, unless otherwise specified.
5.2 Type tests
5.2.1 General examination

The tests shall be carried out in accordance with test 1a: Visual examination, and test 1b:

Examination of dimension and mass, of IEC 60512-2. The visual examination test may be

carried out with magnification up to approximately five times.

All wrapped connections shall be examined to ensure that the applicable requirements of

...