IEC_60112ed4.0en-d.pdf

Method for the determination of the proofand the comparative tracking indicesof solid insulating materialsReference numberIEC 60112:2003(E)INTERNATIONALSTANDARDIEC60112Fourth edition2003-01This English-language version is derived from the originalbilingual publication by leaving out all French-languagepages.Missing page numbers correspond to the French-language pages.BASIC SAFETY PUBLICATION Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series.For example,IEC 34-1 is now referred to as IEC 60034-1.Consolidated editions The IEC is now publishing consolidated versions of its publications.For example,edition numbers 1.0,1.1 and 1.2 refer,respectively,to the base publication,the base publication incorporating amendment 1 and the base publication incorporating amendments 1 and 2.Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC,thus ensuring that the content reflects current technology.Information relating to this publication,including its validity,is available in the IEC Catalogue of publications(see below)in addition to new editions,amendments and corrigenda.Information on the subjects under consideration and work in progress undertaken by the technical committee which has prepared this publication,as well as the list of publications issued,is also available from the following:IEC Web Site(www.iec.ch)Catalogue of IEC publications The on-line catalogue on the IEC web site(www.iec.ch/searchpub)enables you to search by a variety of criteria including text searches,technical committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also available by email.Please contact the Customer Service Centre(see below)for further information.Customer Service Centre If you have any questions regarding this publication or need further assistance,please contact the Customer Service Centre:Email:custserviec.ch Tel:+41 22 919 02 11 Fax:+41 22 919 03 00 Method for the determination of the proofand the comparative tracking indicesof solid insulating materialsFor price,see current catalogue IEC 2003 Copyright-all rights reservedNo 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 the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chINTERNATIONALSTANDARDIEC60112Fourth edition2003-01RCommission Electrotechnique InternationaleInternational Electrotechnical Commission PRICE CODEBASIC SAFETY PUBLICATION60112 IEC:2003 3 CONTENTSFOREWORD.51Scope.92Normative references.93Terms and definitions.114Principle.135Test specimen.136Test specimen conditioning.156.1Environmental conditioning.156.2Test specimen surface state.157Test apparatus.157.1Electrodes.157.2Test circuit.177.3Test solutions.177.4Dropping device.197.5Test specimen support platform.197.6Electrode assembly installation.198Basic test procedure.218.1General.218.2Preparation.218.3Test procedure.239Determination of erosion.2310Determination of proof tracking index(PTI).2310.1 Procedure.2310.2 Report.2511Determination of comparative tracking index(CTI).2511.1 General.2511.2 Determination of the 100 drop point.2511.3 Determination of the maximum 50 drop withstand voltage.2711.4 Report.29Annex A(informative)List of factors that should be considered by product committees.37Annex B(informative)Electrode material selection.39Bibliography.41Figure 1 Electrode.33Figure 2 Electrode/specimen arrangement.33Figure 3 Example of typical electrode mounting and specimen support.35Figure 4 Example of test circuit.3560112 IEC:2003 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION_METHOD FOR THE DETERMINATION OF THE PROOFAND THE COMPARATIVE TRACKING INDICESOF SOLID INSULATING MATERIALSFOREWORD1)The IEC(International Electrotechnical Commission)is a worldwide organization for standardization comprisingall national electrotechnical committees(IEC National Committees).The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields.Tothis end and in addition to other activities,the IEC publishes International Standards.Their preparation isentrusted to technical committees;any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work.International,governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation.The IEC collaborates closely with the InternationalOrganization for Standardization(ISO)in accordance with conditions determined by agreement