IEC 60112:2020
(Main)Method for the determination of the proof and the comparative tracking indices of solid insulating materials
Method for the determination of the proof and the comparative tracking indices of solid insulating materials
IEC 60112:2020 specifies the method of test for the determination of the proof and comparative tracking indices of solid insulating materials on pieces taken from parts of equipment and on plaques of material using alternating voltage. This document provides a procedure for the determination of erosion when required.
This test method evaluates the composition of the material as well as the surface of the material being evaluated. Both the composition and surface condition directly influence the results of the evaluation and are considered when using the results in material selection process.
Test results are not directly suitable for the evaluation of safe creepage distances when designing electrical apparatus.
This basic safety publication focusing on a safety test method is primarily intended for use by technical committees in the preparation of safety publications in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51.
This edition includes the following significant technical changes with respect to the previous edition:
Introduction of a new contaminant, solution C with a surfactant aligned with the test method of IEC 60587. The definition of the solution B was transferred to Annex B for backward reference.
Introduction of a screening test, considering the fact that some materials can withstand high test voltages, but fail at lower test voltages.
It has the status of a basic safety publication in accordance with IEC Guide 104.
Méthode de détermination des indices de résistance et de tenue au cheminement des matériaux isolants solides
L'IEC 60112:2020 spécifie la méthode d’essai pour la détermination des indices de résistance et de tenue au cheminement des matériaux isolants solides sur des échantillons prélevés sur des parties d'équipement et des plaques de matériau en utilisant une tension alternative. Le présent document fournit une procédure pour la détermination de la valeur de l’érosion quand cela est exigé.
Cette méthode d’essai évalue la composition et la surface du matériau soumis à l’essai. La composition et les conditions de surface influencent directement les résultats de l’évaluation et sont prises en considération lors de l’utilisation des résultats au moment de la sélection des matériaux.
Les résultats d’essais tels quels ne sont pas adaptés à l’évaluation des lignes de fuite de sécurité lors de la conception des appareils électriques.
La présente publication fondamentale de sécurité portant sur une méthode d’essai de sécurité est avant tout destinée à être utilisée par les comités d’études dans le cadre de l’élaboration de publications de sécurité, conformément aux principes établis dans le Guide IEC 104 et le Guide lSO/lEC 51.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: Introduction d’un nouveau contaminant, la solution C, avec un tensioactif aligné sur la méthode d’essai de l’IEC 60587. Transfert à l’Annexe B de la définition de la solution B pour référence arrière.
Introduction d’un essai de déverminage, en tenant compte du fait que certains matériaux peuvent supporter des tensions d’essai élevées, mais pas des tensions d’essai plus basses.
Elle a le statut de publication fondamentale de sécurité, conformément au Guide IEC 104.
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IEC 60112 ®
Edition 5.0 2020-10
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
BASIC SAFETY PUBLICATION
Method for the determination of the proof and the comparative tracking indices
of solid insulating materials
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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Switzerland
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 corrigendum or an amendment might have been published.
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IEC 60112 ®
Edition 5.0 2020-10
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
BASIC SAFETY PUBLICATION
Method for the determination of the proof and the comparative tracking indices
of solid insulating materials
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 19.080; 29.035.01 ISBN 978-2-8322-9013-2
– 2 – IEC 60112:2020 CMV © IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references. 6
3 Terms and definitions . 7
4 Principle . 8
5 Test specimen . 8
6 Test specimen conditioning . 9
6.1 Environmental conditioning . 9
6.2 Test specimen surface state . 9
7 Test apparatus . 9
7.1 Electrodes. 9
7.2 Test circuit . 10
7.3 Test solutions . 10
7.4 Dropping device . 11
7.5 Test specimen support platform . 11
7.6 Electrode assembly installation . 11
7.7 Conditioning chamber. 12
8 Basic test procedure . 12
8.1 General . 12
8.2 Preparation . 12
8.3 Test procedure . 13
9 Determination of erosion . 13
10 Determination of Proof tracking index test (PTI). 13
10.1 Procedure . 13
10.2 Report . 14
11 Determination of comparative tracking index (CTI) . 14
11.1 General . 14
11.2 Screening test . 15
11.3 Determination of the maximum 50 drop withstand voltage . 15
11.4 Determination of the 100 drop point . 16
11.5 Report . 17
Annex A (informative) List of factors that should be considered by product committees . 20
Annex B (informative) Solution B . 21
Annex C (informative) Electrode material selection . 22
C.1 Platinum electrodes . 22
C.2 Alternatives . 22
Bibliography . 23
List of comments . 24
Figure 1 – Electrode . 18
Figure 2 – Electrode/specimen arrangement . 18
Figure 3 – Example of typical electrode mounting and specimen support . 18
Figure 4 – Example of test circuit . 19
– 4 – IEC 60112:2020 CMV © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METHOD FOR THE DETERMINATION OF THE PROOF AND THE
COMPARATIVE TRACKING INDICES OF SOLID INSULATING MATERIALS
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.
This commented version (CMV) of the official standard IEC 60112:2020 edition 5.0
allows the user to identify the changes made to the previous edition IEC 60112:2003
+AMD1:2009 CSV edition 4.1. Futhermore, comments from IEC TC 112 experts are
provided to explain the reasons of the most relevant changes.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by
a blue-background number. Mouse over a number to display a pop-up note with the
comment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.
International Standard IEC 60112 has been prepared by IEC technical committee 112:
Evaluation and qualification of electrical insulating materials and systems.
This fifth edition cancels and replaces the fourth edition published in 2003 and
Amendment 1:2009. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
• Introduction of a new contaminant, solution C with a surfactant aligned with the test
method of IEC 60587. The definition of the solution B was transferred to Annex B for
backward reference.
• Introduction of a screening test, considering the fact that some materials can withstand
high test voltages, but fail at lower test voltages.
It has the status of a basic safety publication in accordance with IEC Guide 104.
The text of this International Standard is based on the following documents:
FDIS Report on voting
112/479/FDIS 112/484/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – IEC 60112:2020 CMV © IEC 2020
METHOD FOR THE DETERMINATION OF THE PROOF AND THE
COMPARATIVE TRACKING INDICES OF SOLID INSULATING MATERIALS
1 Scope
This document specifies the method of test for the determination of the proof and comparative
tracking indices of soli
...
IEC 60112 ®
Edition 5.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Method for the determination of the proof and the comparative tracking indices
of solid insulating materials
Méthode de détermination des indices de résistance et de tenue
au cheminement des matériaux isolants solides
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.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and definitions clause of
IEC publications issued between 2002 and 2015. Some
IEC Customer Service Centre - webstore.iec.ch/csc entries have been collected from earlier publications of IEC
If you wish to give us your feedback on this publication or TC 37, 77, 86 and CISPR.
need further assistance, please contact the Customer Service
Centre: sales@iec.ch.
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IEC 60112 ®
Edition 5.0 2020-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC SAFETY PUBLICATION
PUBLICATION FONDAMENTALE DE SÉCURITÉ
Method for the determination of the proof and the comparative tracking indices
of solid insulating materials
Méthode de détermination des indices de résistance et de tenue
au cheminement des matériaux isolants solides
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 19.080; 29.035.01 ISBN 978-2-8322-8748-4
– 2 – IEC 60112:2020 © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Principle . 7
5 Test specimen . 7
6 Test specimen conditioning . 8
6.1 Environmental conditioning . 8
6.2 Test specimen surface state . 8
7 Test apparatus . 8
7.1 Electrodes . 8
7.2 Test circuit . 9
7.3 Test solutions . 9
7.4 Dropping device . 10
7.5 Test specimen support platform . 10
7.6 Electrode assembly installation . 10
7.7 Conditioning chamber . 10
8 Basic test procedure . 11
8.1 General . 11
8.2 Preparation . 11
8.3 Test procedure . 11
9 Determination of erosion . 12
10 Proof tracking index test (PTI) . 12
10.1 Procedure . 12
10.2 Report. 12
11 Determination of comparative tracking index (CTI) . 13
11.1 General . 13
11.2 Screening test . 13
11.3 Determination of the maximum 50 drop withstand voltage . 14
11.4 Determination of the 100 drop point . 15
11.5 Report. 15
Annex A (informative) List of factors that should be considered by product committees . 19
Annex B (informative) Solution B . 20
Annex C (informative) Electrode material selection . 21
C.1 Platinum electrodes . 21
C.2 Alternatives . 21
Bibliography . 22
Figure 1 – Electrode . 17
Figure 2 – Electrode/specimen arrangement . 17
Figure 3 – Example of typical electrode mounting and specimen support . 17
Figure 4 – Example of test circuit . 18
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
METHOD FOR THE DETERMINATION OF THE PROOF AND THE
COMPARATIVE TRACKING INDICES OF SOLID INSULATING MATERIALS
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
...
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