IEC IEC61558-2-4 Edition 3.02021-05 REDLINE VERSION INTERNATIONAL STANDARD colour inside GROUP SAFETYPUBLICATION Safety of transformers, reactors, power supply units and-similar products for supply veltages up to 1 100 V combinations thereof - Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers for general applications IEC 61558-2-4:2021-05 RLV(en) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright @ 2021 IEC, Geneva, Switzerland or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from 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 CentralOffice Tel.: +4122 919 02 11 3, rue de Varembe [email protected] CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC 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 latestedition,a corrigendum oranamendment might have beenpublished. IEC publications search - webstore.iec.ch/advsearchform IEC online collection - oc.iec.ch Discover our powerful search engine and read freely all the publications previews. With a subscription you wili always varietyof criteria(reference number, text, technical committee, ...).It also gives information on projects,replaced have access to uptodate content tailored to your needs. and withdrawn publications. Electropedia - www.electropedia.org IEc Just Published - webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology, Stay uptodateon all newIEC publications.JustPublished containing more than 22 000 terminological entries in English details all new publications released. Available online and and French, with equivalent terms in 18 additional languages. once a month by email. Also known as the International Electrotechnical Vocabulary (IEV) online IECCustomerServiceCentre-webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre: [email protected]. IEC IEC 61558-2-4 Edition 3.0 2021-05 REDLINE VERSION INTERNATIONAL STANDARD colour inside GROUP SAFETY PUBLICATION Safety of transformers, reactors, power supply units and-similar products for supply voltages up to 1 10o V combinations thereof - Part 2-4: Particular requirements and tests for isolating transformers and power INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS 29.180 ISBN 978-2-8322-9829-9 Warning! Make sure that you obtained this publication from an authorized distributor. ? Registered trademark of the Intemational Electrotechnical Commission