IEC IEC60424-4 Edition 2.0 2015-12 INTERNATIONAL STANDARD NORME INTERNATIONALE Ferrite cores-Guidelinesonthe limits of surfaceirregularities- Part4:Ring-cores Noyauxferrites-Lignesdirectricesrelativesauxlimitesdes irregularitesde surface Partie4:Noyauxtoriques IEC 60424-4:2015-12(en-fr) THISPUBLICATIONIS COPYRIGHTPROTECTED Copyright2015IEC,Geneva,Switzerland either IEC or IEC's member National Committee in the country of the requester. if you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,please contact the address below or your local IEC member National Committee for further information. Droits de reproduction reserves. Sauf indication contraire, aucune partie de cette publication ne peut etre reproduite ni utilisee sous quelque forme que ce soit et par aucun procede, electronique ou mecanique,y compris la photocopie et les microfilms, sans I'accord écrit de I'lEC ou du Comite national de I'lEC du pays du demandeur. Si vous avez des questions sur le copyright de I'EC ou si vous desirez obtenir des droits supplementaires sur cette publication, utilisez IEC Central Office Tel.: +41 22 919 02 11 3, rue de Varembe Fax: +4122 919 03 00 CH-1211 Geneva 20 [email protected] Switzerland www.iec.ch AbouttheIEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. AboutIECpublications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. IECCatalogue-webstore.iec.ch/catalogue Electropedia-www.electropedia.org The stand-alone application for consulting theentire The world's leading online dictionary of electronic and bibliographical information on IEc International Standards, electrical terms containing more than 30 000 terms and Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 15 documents. Available for PC, Mac OS, Android Tablets and additional languages.Also _known as the International iPad. Electrotechnical Vocabulary (IEV) online. IEC publications search-www.iec.ch/searchpub IEC Glossary- std.iec.ch/glossary The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in varietyof criteria (reference number,text, technical English and French extracted from the Terms and Definitions committee,...). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries and withdrawn publications. have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR IEC Just Published-webstore.iec.ch/justpublished Stayupto date onall new IECpublications.Just Published IEC Customer Service Centre-webstore.iec.ch/csc details all new publications released. Available online and if you wish to give us your feedback on this publication or also once a month by email. need further assistance,please contact the Customer Service Centre:[email protected]. A propos de IIEC La Commission Electrotechnique Internationale (IEC)est la premiere organisation mondiale qui elabore et publie des Normes internationales pour tout ce qui a trait a I'electricite, a i'electronique et aux technologies apparentees. A propos des publications IEC Le contenu technique des publications IEC est constamment revu.Veuillez vous assurer que vous possedez I'édition la plus recente, un corrigendum ou amendementpeutavoir étepublie. Catalogue IEC-webstore.iec.ch/catalogue Electropedia-www.electropedia.org Applicationautonomepourconsultertouslesrenseignements Le premier dictionnaire en ligne de termes électroniques et bibliographiques sur les Normes internationales, électriques. Il contient plus de 30 ooo termes et definitions en Specifications techniques, Rapports techniques_et autres anglais et