EN 60424-1:2016

SLOVENSKI STANDARD
01-junij-2016
1DGRPHãþD
SIST EN 60424-1:2002
Feritna jedra - Smernice o mejnih vrednostih površinskih nepravilnosti - 1. del:
Splošna specifikacija
Ferrite cores - Guidelines on the limits of surface irregularities - Part 1: General
Specification
Ta slovenski standard je istoveten z: EN 60424-1:2016
ICS:
29.100.10 Magnetne komponente Magnetic components
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN 60424-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2016
ICS 29.100.10 Supersedes EN 60424-1:1999
English Version
Ferrite cores - Guidelines on the limits of surface irregularities -
Part 1: General specification
(IEC 60424-1:2015)
Noyaux ferrites - Lignes directrices relatives aux limites des Ferritkerne - Leitfaden für Grenzwerte von sichtbaren
irrégularités de surface - Beschädigungen der Kernoberfläche -
Partie 1: Spécification générale Teil 1: Fachgrundspezifikation
(IEC 60424-1:2015) (IEC 60424-1:2015)
This European Standard was approved by CENELEC on 2016-01-08. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 60424-1:2016 E
European foreword
The text of document 51/1107/FDIS, future edition 2 of IEC 60424-1, prepared by
IEC/TC 51 "Magnetic components and ferrite materials" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN 60424-1:2016.

The following dates are fixed:
(dop) 2016-10-08
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2019-01-08
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60424-1:1999.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.
Endorsement notice
The text of the International Standard IEC 60424-1:2015 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60401-3 NOTE Harmonized as EN 60401-3.
IEC 60424-2 NOTE Harmonized as EN 60424-2.
IEC 60424-3 NOTE Harmonized as EN 60424-3.
IEC 60424-4 NOTE Harmonized as EN 60424-4.
IEC 60424-8 NOTE Harmonized as EN 60424-8.
IEC 60424-1 ®
Edition 2.0 2015-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on the limits of surface irregularities –

Part 1: General specification
Noyaux ferrites – Lignes directrices relatives aux limites des irrégularités de

surface –
Partie 1: Spécification générale

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-3028-2

– 2 – IEC 60424-1:2015 © IEC 2015
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative reference . 6
3 Terms and definitions. 6
4 Examples of irregularities . 7
5 Locations and functions of core parts and surfaces . 7
5.1 General . 7
5.2 Mating surfaces . 7
5.3 Centre post . 8
5.4 Outer walls or legs . 8
5.5 Back wall, bottom and back surfaces . 8
5.6 Wire-slot area . 8
5.7 Wire-way area . 8
5.8 Clamping recess area . 8
6 Area and length reference for visual inspection . 8
7 Limits of surface irregularities . 11
7.1 General . 11
7.2 Chips and ragged edges . 11
7.3 Cracks . 11
7.4 Flash. 11
7.5 Pull-outs . 11
7.6 Pores . 11
7.7 Crystallites . 11
8 Sectional specifications . 11
Bibliography . 13

Figure 1 – Examples of surface irregularities . 7
Figure 2 – Location of main core parts and surfaces – Example of RM-core type . 7

Table 1 – Area and length reference for visual inspection . 10
Table 2 – IEC 60424 sectional specifications . 12

IEC 60424-1:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES –
GUIDELINES ON THE LIMITS OF SURFACE IRREGULARITIES –

Part 1: General specification
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60424-1 has been prepared IEC technical committee 51: Magnetic
components and ferrite materials.
This second edition cancels and replaces the first edition published in 1999. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of pores in 3.5 and crystallites in 3.6.

– 4 – IEC 60424-1:2015 © IEC 2015
The text of this standard is based on the following documents:
FDIS Report on voting
51/1107/FDIS 51/1123/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 60424 series, published under the general title Ferrite cores –
Guidelines on the limits of surface irregularities, can be found on the IEC website.
Future standards in this series will carry the new general title as cited above. Titles of existing
standards in this series will be updated at the time of the next edition.
The committee has decided that the contents of this publication will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IEC 60424-1:2015 © IEC 2015 – 5 –
INTRODUCTION
Due to the method of manufacture and the physical nature of the products, ferrite cores can be
expected to exhibit some degree of physical irregularities such as chips, ragged edges, cracks,
flashing, and pull-out.
The permissible extent of these surface irregularities will depend on the type, position and size
of the defect and on the function of the core. Thus, in order to establish limits of surface
irregularities for a given series of ferrite cores, for example RM-cores, pot-cores, E-cores, U-
cores and ring-cores, it is necessary to prepare a particular specification for each, setting out
in detail the permissible extent of the various types of
...