IEC 60424-4:2015

Gives guidance on allowable limits of surface irregularities applicable to ring-cores in accordance with the relevant generic specification IEC 60424-1. Is considered to be useful in the negotiation between ferrite core manufacturers and customers about surface irregularities.

IEC 63093-12:2019 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of ring-cores, also called toroid cores, and the effective parameter values to be used in calculations involving them. It also gives guidelines on allowable limits of surface irregularities applicable to ring-cores. This document is a specification useful in the negotiations between ferrite core manufacturers and users about surface irregularities. This first edition cancels and replaces the first edition of IEC 62317-12 published in 2016 and the second edition of IEC 60424-4 published in 2015. This edition constitutes a technical revision. IEC 63093-12 integrates the contents of IEC 62317-12:2016 and IEC 60424-4:2015.