This document specifies marking locations and a coding system of marking on ferrite cores. An alphanumerical marking printed or attached to cores reduces the risk of incorrect assembly, mixing of materials and/or mixing of gapped cores on an assembly line. The markings of the inductance factor A value or of the gap length are especially important to avoid this kind of L problem, and their coding system is specified in this document.dition 2.0 2019-07 INTERNATIONAL STANDARD NORME INTERNATIONALE Marking on ferrite cores Marquage des noyaux ferrites IEC 61333:2019-07(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright ？ 2019 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including ph