IEC 60172:2015

Test procedure for the determination of the temperature index of enamelled and tape wrapped winding wires

IEC 60172:2015 specifies, in accordance with the provisions of IEC 60216-1, a method for evaluating the temperature index of enamelled wire, varnished or unvarnished with an impregnating agent, and of tape wrapped round and rectangular wire, in air at atmospheric pressure by periodically monitoring changes in response to AC proof voltage tests. This procedure does not apply to fibre-insulated wire or wire covered with tapes containing inorganic fibres. This fourth edition cancels and replaces the third edition published in 1987, Amendment 1:1997 and Amendment 2:2010. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- Revision of Clause 1, Scope, to incorporate appropriate text from former Clause 2, Object;
- Deletion of Clause 2, Object, by placement of its text into existing clauses;
- New Clause 2, Normative references;
- Revision of 5.1.1, 5.3 and 5.4 with corrections to Amendment 2 to the third edition;
- Revision of Clause 7 as to clarify which specimens comply with Table 3 and Table 4;
- Revision of figures with high-resolution photos and graphs. Keywords: enamelled wire, tape wrapped round and rectangular wire, AC proof voltage tests

Méthode d'essai pour la détermination de l'indice de température des fils de bobinage émaillés et enveloppés de ruban

L'IEC 60172:2015 spécifie, conformément aux dispositions de l'IEC 60216-1, une méthode pour l'évaluation de l'indice de température du fil émaillé, imprégné ou non imprégné avec un matériau d'imprégnation, et du fil de section circulaire ou rectangulaire, enveloppé de ruban, dans l'air à la pression atmosphérique, en contrôlant périodiquement les variations de réponse aux essais de tension d'épreuve en courant alternatif. Cette méthode ne concerne pas le fil avec revêtement fibreux ou le fil recouvert de rubans contenant des fibres non organiques. Cette quatrième édition annule et remplace la troisième édition parue en 1987, l'Amendement 1:1997 et l'Amendement 2:2010. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Révision de l'Article 1 (Domaine d'application): intégration du texte approprié issu de l'ancien Article 2 (Objet);
- Suppression de l'Article 2 (Objet): texte correspondant reporté dans les articles existants;
- Nouvel Article 2 (Références normatives);
- Révision de 5.1.1, 5.3 et 5.4 avec corrections apportées à l'Amendement 2 à la troisième édition;
- Révision de l'Article 7 de manière à préciser les éprouvettes qui répondent aux exigences du Tableau 3 et du Tableau 4;
- Révision des figures avec photos et graphiques haute résolution. Mots clés: fil émaillé, fil de section circulaire ou rectangulaire enveloppé de ruban, essais de tension d'épreuve en courant alternatif

General Information

• Status: Published
• Publication Date: 11-May-2015
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.060.10 - Wires
• Technical Committee: TC 55 - Winding wires
• Drafting Committee: WG 1 - TC 55/WG 1
• Current Stage: DELPUB - Deleted Publication
• Start Date: 30-Dec-2019
• Completion Date: 23-Nov-2020

Relations

• Revises: IEC 60172:1987/AMD1:1997 - Amendment 1 - Test procedure for the determination of the temperature index of enamelled winding wires
• Effective Date: 05-Sep-2023
• Revised: IEC 60172:2020 - Test procedure for the determination of the temperature index of enamelled and tape wrapped winding wires
• Effective Date: 05-Sep-2023
• Revises: IEC 60172:1987/AMD2:2010 - Amendment 2 - Test procedure for the determination of the temperature index of enamelled winding wires
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60172 ®
Edition 4.0 2015-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Test procedure for the determination of the temperature index of enamelled and
tape wrapped winding wires
Méthode d’essai pour la détermination de l’indice de température des fils de
bobinage émaillés et enveloppés de ruban

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
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: [e-mail].
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient plus de 30 000 termes et définitions en
Spécifications techniques, Rapports techniques et autres
anglais et en français, ainsi que les termes équivalents dans
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
15 langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.

Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
Plus de 60 000 entrées terminologiques électrotechniques, en
La recherche avancée permet de trouver des publications IEC
en utilisant différents critères (numéro de référence, texte, anglais et en français, extraites des articles Termes et
comité d’études,…). Elle donne aussi des informations sur les Définitions des publications IEC parues depuis 2002. Plus
projets et les publications remplacées ou retirées. certaines entrées antérieures extraites des publications des

CE 37, 77, 86 et CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished

Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications IEC. Just
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
[e-mail].
IEC 60172 ®
Edition 4.0 2015-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Test procedure for the determination of the temperature index of enamelled and

tape wrapped winding wires
Méthode d’essai pour la détermination de l’indice de température des fils de

bobinage émaillés et enveloppés de ruban

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.060.10 ISBN 978-2-8322-2676-6

– 2 – IEC 60172:2015 © IEC 2015
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Summary of procedure . 7
5 Test specimens . 7
5.1 Preparation . 7
5.1.1 Enamelled round wire with a nominal conductor diameter of 0,224 mm
up to and including 2,65 mm . 7
5.1.2 Tape wrapped round wire and enamelled or tape wrapped rectangular
wire . 10
5.2 Varnish impregnation . 12
5.3 Notes on number of test specimens . 13
5.4 Specimen holder . 13
5.4.1 For specimens according to 5.1.1 . 13
5.4.2 For specimens according to 5.1.2 . 14
6 Temperature exposure. 14
7 Test voltage and its application . 16
8 Calculations . 16
8.1 Specimen failure time . 16
8.2 Time to failure . 17
8.3 Linearity of data . 17
8.4 Calculating and plotting thermal endurance and temperature index . 17
9 Report . 18
Annex A (normative) Method for calculation of the regression line . 19
Annex B (normative) Correlation coefficient . 24
Bibliography . 26

Figure 1 – Device used to form enamelled round wire test specimen . 8
Figure 2 – Spacer . 8
Figure 3 – Twist forming jig . 9
Figure 4 – Test specimen set up in forming jig . 9
Figure 5 – Test specimen formed with loop cut . 10
Figure 6 – Jig for bending large magnet wire, dielectric test specimen . 11
Figure 7 – Forming jig and test specimen . 12
Figure 8 – Specimen holder . 13
Figure 9 – Specimen holder and electrical connection fixture . 14
Figure 10 – Thermal endurance graph – Temperature index . 18
Figure A.1 – Plot of regression line based on sample calculation (Table A.2) . 23

Table 1 – Force and number of twists for specimens . 8
Table 2 – Proof voltage for round enamelled wire . 10
Table 3 – Recommended exposure times in days per cycle. 15

Table 4 – Proof voltage for tape-wrapped round and for enamelled or tape-wrapped
rectangular wire . 16
Table A.1 – Commonly used test temperatures in degrees Celsius and the
corresponding kelvins with its reciprocal and reciprocal squared values . 21
Table A.2 – Sample calculation . 22

– 4 – IEC 60172:2015 © IEC 2015
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEST PROCEDURE FOR THE DETERMINATION OF THE TEMPERATURE
INDEX OF ENAMELLED AND TAPE WRAPPED WINDING WIRES

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 shoul
...