SIST EN 60172:2015

SLOVENSKI STANDARD
01-september-2015
1DGRPHãþD
SIST EN 60172:2001
SIST EN 60172:2001/A1:2001
SIST EN 60172:2001/A2:2010
Preskusni postopek za ugotavljanje temperaturnega indeksa emajlirane in s
trakom ovite žice za navitja
Test procedure for the determination of the temperature index of enamelled and tape
wrapped winding wires
Prüfverfahren zur Bestimmung des Temperaturindex von Lackdrähten und
bandumwickelten Drähten
Méthode d’essai pour la détermination de l’indice de température des fils de bobinage
émaillés et enveloppés de ruban
Ta slovenski standard je istoveten z: EN 60172:2015
ICS:
17.200.01 Termodinamika na splošno Thermodynamics in general
29.060.10 Žice Wires
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60172
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2015
ICS 29.060.10 Supersedes EN 60172:1994
English Version
Test procedure for the determination of the temperature index of
enamelled and tape wrapped winding wires
(IEC 60172:2015)
Méthode d'essai pour la détermination de l'indice de Prüfverfahren zur Bestimmung des Temperaturindex von
température des fils de bobinage émaillés et enveloppés de Lackdrähten und bandumwickelten Drähten
ruban (IEC 60172:2015)
(IEC 60172:2015)
This European Standard was approved by CENELEC on 2015-06-16. 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60172:2015 E
European foreword
The text of document 55/1518/FDIS, future edition 4 of IEC 60172, prepared by IEC/TC 55 "Winding
wires" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
(dop) 2016-03-16
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2018-06-16
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60172:1994.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60172:2015 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 60317 (series) NOTE Harmonized as EN 60317 (series).
IEC 60455-3-5 NOTE Harmonized as EN 60455-3-5.
IEC 60464-3-2 NOTE Harmonized as EN 60464-3-2.

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
NOTE 1 When 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 60216-1 -  Electrical insulating materials - Thermal EN 60216-1 -
endurance properties -- Part 1: Ageing
procedures and evaluation of test results
IEC 60216-3 -  Electrical insulating materials - Thermal EN 60216-3 -
endurance properties -- Part 3: Instructions
for calculating thermal endurance
characteristics
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

IEC 60172:2015 © IEC 2015 – 3 –
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 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 60172 has been prepared by IEC Technical Committee 55:
Winding wires.
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.

IEC 60172:2015 © IEC 2015 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
55/1518/FDIS 55/1524/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.
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
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 60172:2015 © IEC 2015
TEST PROCEDURE FOR THE DETERMINATION OF THE TEMPERATURE
INDEX OF ENAMELLED AND TAPE WRAPPED WINDING WIRES

1 Scope
This International Standard 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.
NOTE The data obtained according to this test procedure provide the designer and development engineer with
information for the selection of winding wire for further evaluation of insulation systems and equipment tests.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and
are indispensable for its application. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 60216-1, Electrical insulating materials – Thermal endurance properties – Part 1: Ageing
procedures and evaluation of test results
IEC 60216-3, Electrical insulating materials – Thermal endurance properties – Part 3:
Instructions for calculating thermal endurance characteristics
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
temperature index
TI
numerical value of the Celsius temperature expressed in degrees Celsius characterizing the
thermal capability of an insulating material or an insulation system
Note 1 to entry: In case of insulating materials, the temperature index is derived from the thermal endurance
relationship at a given time, normally 20 000 hours. It may be used as basis for determination of the material’s
temperature class.
Note 2 to entry: In case of insulation systems, the temperature index may be derived from known service
experience or from a known comparative functional evaluation of an evaluated and established reference insulation
system as basis.
[SOURCE: IEC 60050-212:2010, 212-12-11]
3.2
specimen failure time
number of hours at the exposure temperature that have elapsed at the time a specimen
fails the proof test
IEC 60172:2015 © IEC 2015 – 7 –
3.3
time to failure
L
number of hours to failure calculated from the specimen failure times for a set of
specimens at one exposure temperature
4 Summary of procedure
A set of specimens in accordance with Clause 5 is subjected to a testing cycle. This cycle
consists of a heat-storing period at a temperature given in Clause 6, followed by a proof
voltage test at room temperature in accordance with Clause 7.
This cycle is repeated until a sufficient number of specimens has failed. The time to failure is
calculated in accordance with Clause 8. The test is carried out at three or more
temperatures. A regression line is calculated in accordance with 8.4 and the time to failure
values plotted on thermal endurance graph paper as a function of the exposure
temperature.
The temperature in degrees Celsius, corresponding to the point of intersection of the
regression line with the ordinate of 20 000 h endurance represents the temperature index of
the winding wire under test.
5 Test specimens
5.1 Preparation
5.1.1 Enamelled round wire with a nominal conductor diameter of 0,224 mm up to and
including 2,65 mm
The grade of insulation used for determining the thermal index shall be grade 2 or grade 2B
for self-bonding winding wires.
Wire sizes 0,315 mm and 0,28 mm are permitted for use when the specification size range is
limited to 0,50 mm and finer.
NOTE For round enamelled winding wires, in order to avoid undue fragility of the test specimen, experience has
shown that nominal conductor diameters of 0,800 mm up to and including 2,65 mm are generally found convenient
to handle and test.
Specimens shall be prepared as follows:
a) A wire specimen approximately 400 mm in length shall be twisted together over a distance
of 125 mm with a device as shown in Figure 1. The force (weight) applied to the wire pair
while being twisted and the number of twists are specified in Table 1.

– 8 – IEC 60172:2015 © IEC 2015

IEC
Figure 1 – Device used to form enamelled round wire test specimen
Table 1 – Force and number of twists for specimens
Nominal diameter Force applied to wire pair Number of twists per
125 mm
mm N
Over Up to and including
0,224 0,25 0,85 33
0,25 0,35 1,7 23
0,35 0,50 3,4 16
0,50 0,75 7,0 12
0,75 1,05 13,5 8
1,05 1,50 27,0 6
1,50 2,15 54,0 4
2,15 3,50 108,0 3
b) Spacers may be prepared as shown in Figure 2. Such thermally stable insulating
materials as ceramic or silicone glass fibre laminate may be used. The spacers are
marked with a suitable identifying letter or number.
3 19
Drill two holes to match wire diameter
IEC
Material: Silicone glass laminate
Dimensions in millimetres
Figure 2 – Spacer
IEC 60172:2015 © IEC 2015 – 9 –
c) The test specimens may be shaped in a jig, an engineering drawing of which is shown
in Figure 3. A specimen is placed in the jig and a spacer, placed on the parallel leads
of the twisted pair, is brought up to the face of the jig as shown in Figure 4. The leads
are then bent parallel to hold the spacer in position. The forming jig provides more
uniform test specimens. If a specimen holder is used, the spacers are unnecessary.
R3,2
R1,2
R3,2
6,5 ∅ pin, press fit
IEC
R = Radius of bend
Dimensions in millimetres
Figure 3 – Twist forming jig
Forming jig
Push spacer to top
Enamelled wire twist
Bend ends parallel to hold spacer
IEC
Figure 4 – Test specimen set up in forming jig
d) The loop at the end of the twisted section shall be cut at two places (not one) to
provide the maximum spacing between the cut ends as shown in Figure 5. Any bending
of the wires, at this end or the other untwisted end, to ensure adequate separation
insulation.
between the wires shall avoid sharp bends or damage to the

– 10 – IEC 60172:2015 © IEC 2015
Cut loop in two places
IEC
Figure 5 – Test specimen formed with loop cut
e) In order to ensure homogeneity of the batch of test specimens, it is recommended that
test specimens be subjected to a test voltage three times the value given in
Table 2 for 1 s.
Table 2 – Proof voltage for round enamelled wire
Voltage
Increase in diameter due to the insulation
(rms)
(mm)
Over Up to and including
– 0,015 300
0,015 0,024 300
0,024 0,035 400
0,035 0,050 500
0,050 0,070 700
0,070 0,090 1 000
0,090 0,130 1 200
5.1.2 Tape wrapped round wire and enamelled or tape wr
...