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IEC_60426
2007
INTERNATIONAL STANDARD IEC60426 Second edition2007-01 Electrical insulating materials Determination of electrolytic corrosion caused by insulating materials Test methods Reference number IEC 60426:2007(E)LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.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committees and date of publication.On-line information is also available on recently issued publications,withdrawn and replaced publications,as well as corrigenda.IEC Just Published This summary of recently issued publications(www.iec.ch/online_news/justpub)is also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 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONAL STANDARD IEC60426 Second edition2007-01 Electrical insulating materials Determination of electrolytic corrosion caused by insulating materials Test methods IEC 2007 Copyright-all rights reserved 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 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.ch U For price,see current cataloguePRICE CODE Commission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 60426 IEC:2007(E)CONTENTS FOREWORD.4 INTRODUCTION.6 1 Scope.7 2 Normative references.7 3 Terms and definitions.7 4 General description of the test method.8 5 Test specimens.8 5.1 General.8 5.2 Cut surfaces of rigid materials(blocks,plates,sheets or semi-finished materials).9 5.3 Cast,moulding,injection and pressed materials.9 5.4 Cut surfaces of flexible films,foils and thin sheets.9 5.5 Adhesive tapes.10 5.6 Flexible sleeving and tubing.10 5.7 Lacquers and insulating varnishes.10 5.8 Cleanliness of contact surfaces.10 5.9 Number of test specimens.11 6 Test strips.11 6.1 General.11 6.2 Preparation of the test strips.11 6.3 Cleanliness of test strips.12 7 Test device.12 8 Test conditions.14 9 Test procedure.14 10 Evaluation.14 10.1 General evaluation.14 10.2 Visual inspection of the test strips.15 10.3 Tensile strength of test strips.15 11 Evaluation of corrosion on copper strips.16 12 Test report.17 Annex A(normative)Tables for the evaluation of corrosion on brass and aluminium strips.18 Annex B(informative)Notes on visual evaluation.20 Annex C(informative)Copper wire tensile strength method.21 Figure 1 Test specimen of rigid material,for example textile laminate.8 Figure 2 Test specimen of flexible material,for example flexible films,foils etc.10 Figure 3 Test strip.12 Figure 4 Test device for determining electrolytic corrosion.13 Figure C.1 Apparatus for determining electrolytic corrosion of rigid insulating material.23 Figure C.2 Apparatus for determining electrolytic corrosion of flexible insulating material.23 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.60426 IEC:2007(E)3 Table 1 Degrees of corrosion of copper strips.16 Table A.1 Degrees of corrosion of brass strips.18 Table A.2 Degrees of corrosion of aluminium strips.19 LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPP