IEC IECTR61858-3 Edition 1.02020-12 TECHNICAL REPORT Electrical insulation systems - Thermal evaluation of modifications to an established electrical insulation system (Els) Part 3: Clarification of electrical insulating materials (EIMs) and auxiliary materials IEC TR 61858-3:2020-12(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright @ 2020 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form orbyanymeans,electronicormechanical,includingphotocopyingand microfilm,without permissioninwritingfrom copyright or have an enquiry about obtaining additional rights to this publication, piease contact the address below or your local IEC member National Committee for further information. IEC Central Office Tel.: +41 22 919 02 11 3,ruedeVarembé CH-1211 Geneva 20 www.iec.ch Switzerland About theIEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standardsforall electrical, electronicand relatedtechnologies. 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 havebeen published IEcpublicationssearch-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, containing more than 22 000 terminological entries in English varietyof criteria (reference text, technical number, committee...). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages. Also known as the International Electrotechnical Vocabulary and withdrawn publications. (IEV) online. IEc Just Published-webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published IECGlossary-std.iec.ch/glossary 67 000 electrotechnical terminology entries in English and details all new publications released.Available online and once a month by email. French extracted from the Terms and Definitions clause of iEC publications issued since 2002. Some entries have been IECCustomerServiceCentre-webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and If you wish to give us your feedback on this publication or CISPR. need further assistance, please contact the Customer Service Centre: [email protected]. Copyright Internaltional Electrotechnical Commission IEC IEC TR 61858-3 Edition 1.02020-12 TECHNICAL REPORT Electrical insulation systems - Thermal evaluation of modifications to an established electrical insulation system (Els) Part 3: Clarification of electrical insulating materials (ElMs) and auxiliary materials INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.080.30 ISBN 978-2-8322-9135-1 Warning! Make sure that you obtained this publication from an authorized distributor. ? Registered trademark of the International Electrotechnical Commission Copyright International Electrotechnical Commission