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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
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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
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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
...