IEC 60851-3:2023

Winding wires - Test methods - Part 3: Mechanical properties

IEC 60851-3: 2023 specifies the following test methods for winding wires:
- Test 6: Elongation;
- Test 7: Springiness;
- Test 8: Flexibility and adherence;
- Test 11: Resistance to abrasion;
- Test 18: Heat bonding.
For definitions, general notes on test methods and the complete series of test methods for winding wires, IEC 60851-1 applies. This document also provides recommended friction test methods in Annex B. This fourth edition cancels and replaces the third edition published in 2009, Amendment 1:2013 and Amendment 2:2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Clarification of the distance measurement for determining loss of adhesion in 6.6.3, 6.6.4 for fibre-covered wires and 6.6.5 for tape-wrapped wires.

Fils de bobinage - Méthodes d'essai - Partie 3: Propriétés mécaniques

IEC 60851-3: 2023 spécifie les méthodes d’essai suivantes pour les fils de bobinage:
- Essai 6: Allongement;
- Essai 7: Effet de ressort;
- Essai 8: Souplesse et adhérence;
- Essai 11: Résistance à l’abrasion;.
- Essai 18: Thermoadhérence.
Pour les définitions, les généralités concernant les méthodes d’essai et les séries complètes des méthodes d’essai des fils de bobinage, c’est l’IEC 60851-1 qui s’applique. Le présent document donne aussi les méthodes d’essai de frottement recommandées dans l'Annexe B. Cette quatrième édition annule et remplace la troisième édition parue en 2009, l’Amendement 1 paru en 2013 et l’Amendement 2 paru en 2019. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) clarification de la mesure de distance visant à déterminer la perte d’adhérence en 6.6.3, en 6.6.4 pour les fils recouverts d’une enveloppe fibreuse et en 6.6.5 pour les fils rubanés.

General Information

• Status: Published
• Publication Date: 21-Aug-2023
• ICS: 29.060.10 - Wires
• Technical Committee: TC 55 - Winding wires
• Drafting Committee: WG 1 - TC 55/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 11-Sep-2023
• Completion Date: 22-Aug-2023

Relations

• Revises: IEC 60851-3:2009/AMD1:2013 - Amendment 1 - Winding wires - Test methods - Part 3: Mechanical properties
• Effective Date: 05-Sep-2023
• Revises: IEC 60851-3:2009 - Winding wires - Test methods - Part 3: Mechanical properties
• Effective Date: 05-Sep-2023
• Revises: IEC 60851-3:2009/AMD2:2019 - Amendment 2 - Winding wires - Test methods - Part 3: Mechanical properties
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60851-3 ®
Edition 4.0 2023-08
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Winding wires – Test methods –
Part 3: Mechanical properties
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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copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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About the IEC
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IEC 60851-3 ®
Edition 4.0 2023-08
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Winding wires – Test methods –
Part 3: Mechanical properties
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.060.10 ISBN 978-2-8322-7448-4

– 2 – IEC 60851-3:2023 RLV © IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Test 6: Elongation . 8
4.1 Elongation at fracture . 8
4.2 Tensile strength . 9
5 Test 7: Springiness . 9
5.1 General . 9
5.2 Round wire with a nominal conductor diameter from 0,080 mm up to and
including 1,600 mm . 9
5.2.1 Principle . 9
5.2.2 Equipment . 9
5.2.3 Procedure . 11
5.3 Round wire with a nominal conductor diameter over 1,600 mm and
rectangular wire . 12
5.3.1 Principle . 12
5.3.2 Equipment . 12
5.3.3 Specimen . 13
5.3.4 Procedure . 13
6 Test 8: Flexibility and adherence . 14
6.1 General . 14
6.2 Mandrel winding test . 14
6.2.1 Round wire . 14
6.2.2 Rectangular wire. 15
6.2.3 Covered bunched wire . 16
6.3 Stretching test (applicable to enamelled round wire with a nominal conductor
diameter over 1,600 mm) . 16
6.4 Jerk test (applicable to enamelled round wire with a nominal conductor
diameter up to and including 1,000 mm) . 17
6.5 Peel test (applicable to enamelled round wire with a nominal conductor
diameter over 1,000 mm) . 17
6.6 Adherence test . 19
6.6.1 General . 19
6.6.2 Enamelled rectangular wire . 19
6.6.3 Impregnated fibre covered round and rectangular wire . 19
6.6.4 Fibre covered enamelled round and rectangular wire . 19
6.6.5 Tape-wrapped round and rectangular wire (for adhesive tape only) . 20
7 Test 11: Resistance to abrasion (applicable to enamelled round wire) . 20
7.1 General . 20
7.2 Principle . 20
7.3 Equipment . 20
7.4 Procedure . 21
8 Test 18: Heat bonding (applicable to enamelled round wire with a nominal
conductor diameter over 0,050 mm up to and including 2,000 mm and to
enamelled rectangular wire) . 22

8.1 General . 22
8.2 Vertical bond retention of a helical coil . 22
8.2.1 General . 22
8.2.2 Nominal conductor diameter up to and including 0,050 mm . 22
8.2.3 Nominal conductor diameter over 0,050 mm up to and including

2,000 mm . 22
8.3 Bond strength of a twisted coil . 25
8.3.1 General . 25
8.3.2 Principle . 25
8.3.3 Equipment . 25
8.3.4 Specimen . 25
8.3.5 Procedure . 27
8.3.6 Result . 27
8.4 Enamelled rectangular wire heat bonding . 28
Annex A (informative) Bond strength of heat bonding wires . 30
A.1 Calculation of the temperature of the twisted coil specimen . 30
A.1.1 Method . 30
A.1.2 Temperature coefficient . 30
A.1.3 Calculation . 30
A.2 Determination of the heating period . 31
A.2.1 Voltage-time graphs. 31
A.2.2 Voltage at maximum temperature . 31
Annex B (informative) Friction test methods . 36
B.1 General . 36
B.2 Test A: Static coefficient of friction test method . 36
B.2.1 Test method (applicable to enamelled round wires with a nominal
conductor diameter from 0,050 mm up to and including 1,600 mm) . 36
B.2.2 Test apparatus . 36
B.3 Test B: First dynamic coefficient of friction test method . 37
B.3.1 Principle . 37
B.3.2 Method of test. 37
B.4 Test C: Second dynamic coefficient of friction test method (applicable to
enamelled round wires with a nominal conductor diameter from 0,050 mm up
to and including 1,600 mm) . 37
B.4.1 Test equipment . 37
B.4.2 Test specimen . 38
B.4.3 Specimen preparation . 38
B.4.4 Procedure . 39
B.5 Test D: Force of friction by the twisted pair method . 40
B.5.1 Enamelled round wires with a nominal conductor diameter from 0,1 mm
up to and including 1,500 mm . 40
B.5.2 Test method . 40
Bibliography . 46

Figure 1 – Test equipment to determine springiness . 10
Figure 2 – Construction and details of the mandrel (see Table 1) . 10
Figure 3 – Test equipment to determine springiness . 13
Figure 4 – Test equipment for mandrel winding test . 16
Figure 5 – Test equipment for jerk test . 17

– 4 – IEC 60851-3:2023 RLV © IEC 2023
Figure 6 – Test equipment for peel test . 18
Figure 7 – Scraper . 19
Figure 8 – Cross-section of the wire after removal of the coating . 19
Figure 9 – Test equipment for unidirectional scrape test . 21
Figure 10 – Test equipment for bond retention of a helical coil . 24
Figure 11 – Coil winder . 26
Figure 12 – Oval shape coil .
...

IEC 60851-3 ®
Edition 4.0 2023-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Winding wires – Test methods –
Part 3: Mechanical properties
Fils de bobinage – Méthodes d'essai –
Partie 3: Propriétés mécaniques
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
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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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latest edition, a corrigendum or an amendment might have been published.

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IEC 60851-3 ®
Edition 4.0 2023-08
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Winding wires – Test methods –

Part 3: Mechanical properties
Fils de bobinage – Méthodes d'essai –

Partie 3: Propriétés mécaniques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.060.10  ISBN 978-2-8322-7372-2

– 2 – IEC 60851-3:2023 © IEC 2023
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Test 6: Elongation . 8
4.1 Elongation at fracture . 8
4.2 Tensile strength . 9
5 Test 7: Springiness . 9
5.1 General . 9
5.2 Round wire with a nominal conductor diameter from 0,080 mm up to and
including 1,600 mm . 9
5.2.1 Principle . 9
5.2.2 Equipment . 9
5.2.3 Procedure . 11
5.3 Round wire with a nominal conductor diameter over 1,600 mm and
rectangular wire . 12
5.3.1 Principle . 12
5.3.2 Equipment . 12
5.3.3 Specimen . 13
5.3.4 Procedure . 13
6 Test 8: Flexibility and adherence . 14
6.1 General . 14
6.2 Mandrel winding test . 14
6.2.1 Round wire . 14
6.2.2 Rectangular wire. 15
6.2.3 Covered bunched wire . 16
6.3 Stretching test (applicable to enamelled round wire with a nominal conductor
diameter over 1,600 mm) . 16
6.4 Jerk test (applicable to enamelled round wire with a nominal conductor
diameter up to and including 1,000 mm) . 17
6.5 Peel test (applicable to enamelled round wire with a nominal conductor
diameter over 1,000 mm) . 17
6.6 Adherence test . 19
6.6.1 General . 19
6.6.2 Enamelled rectangular wire . 19
6.6.3 Impregnated fibre covered round and rectangular wire . 19
6.6.4 Fibre covered enamelled round and rectangular wire . 19
6.6.5 Tape-wrapped round and rectangular wire (for adhesive tape only) . 20
7 Test 11: Resistance to abrasion (applicable to enamelled round wire) . 20
7.1 General . 20
7.2 Principle . 20
7.3 Equipment . 20
7.4 Procedure . 21
8 Test 18: Heat bonding (applicable to enamelled round wire with a nominal
conductor diameter over 0,050 mm up to and including 2,000 mm and to
enamelled rectangular wire) . 22

8.1 General . 22
8.2 Vertical bond retention of a helical coil . 22
8.2.1 General . 22
8.2.2 Nominal conductor diameter up to and including 0,050 mm . 22
8.2.3 Nominal conductor diameter over 0,050 mm up to and including

2,000 mm . 22
8.3 Bond strength of a twisted coil . 25
8.3.1 General . 25
8.3.2 Principle . 25
8.3.3 Equipment . 25
8.3.4 Specimen . 25
8.3.5 Procedure . 27
8.3.6 Result . 27
8.4 Enamelled rectangular wire heat bonding . 28
Annex A (informative) Bond strength of heat bonding wires . 30
A.1 Calculation of the temperature of the twisted coil specimen . 30
A.1.1 Method . 30
A.1.2 Temperature coefficient . 30
A.1.3 Calculation . 30
A.2 Determination of the heating period . 31
A.2.1 Voltage-time graphs. 31
A.2.2 Voltage at maximum temperature . 31
Annex B (informative) Friction test methods . 36
B.1 General . 36
B.2 Test A: Static coefficient of friction test method . 36
B.2.1 Test method (applicable to enamelled round wires with a nominal
conductor diameter from 0,050 mm up to and including 1,600 mm) . 36
B.2.2 Test apparatus . 36
B.3 Test B: First dynamic coefficient of friction test method . 37
B.3.1 Principle . 37
B.3.2 Method of test.
...