EN 60424-2:2016

SLOVENSKI STANDARD
01-junij-2016
1DGRPHãþD
SIST EN 60424-2:2002
Feritna jedra - Smernice o mejnih vrednostih površinskih nepravilnosti - 2. del: RM
-jedra
Ferrite cores - Guidelines on the limits of surface irregularities - Part 2: RM-cores
Noyaux ferrites - Lignes directrices relatives aux limites des irrégularités de surface -
Partie 2: Noyaux RM
Ta slovenski standard je istoveten z: EN 60424-2:2016
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 60424-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2016
ICS 29.100.10 Supersedes EN 60424-2:1997
English Version
Ferrite cores - Guidelines on the limits of surface irregularities -
Part 2: RM-cores
(IEC 60424-2:2015)
Noyaux ferrites - Lignes directrices relatives aux limites des Ferritkerne - Leitfaden für Grenzwerte von sichtbaren
irrégularités de surface - Beschädigungen der Kernoberfläche -
Partie 2: Noyaux RM Teil 2: RM-Kerne
(IEC 60424-2:2015) (IEC 60424-2:2015)
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 60424-2:2016 E
European foreword
The text of document 51/1108/FDIS, future edition 2 of IEC 60424-2, prepared by
IEC/TC 51 "Magnetic components and ferrite materials" was submitted to the IEC-CENELEC parallel
vote and approved by CENELEC as EN 60424-2:2016.

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 60424-2:1997.

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 60424-2:2015 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 60424-1 NOTE Harmonized as EN 60424-1.
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 60424-5 NOTE Harmonized as EN 60424-5.
IEC 60424-2 ®
Edition 2.0 2012
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on the limits of surface irregularities –

Part 2: RM-cores
Noyaux ferrites – Lignes directrices relatives aux limites des irrégularités de

surface –
Partie 2: Noyaux RM
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-3031-2

– 2 – IEC 60424-2:2015 © IEC 2015
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Limits of surface irregularities . 5
3.1 Visual inspection and recommended limits . 5
3.2 Chips and ragged edges . 6
3.2.1 Chips and ragged edges on mating surfaces . 6
3.2.2 Chips and ragged edges on other surfaces . 6
3.3 Cracks . 9
3.4 Flash. 10
3.5 Pull-outs . 10
3.6 Crystallites . 11
3.7 Pores . 12
Bibliography . 13

Figure 1 – Chips and ragged edges on mating surfaces . 6
Figure 2 – Cracks location – Top view . 9
Figure 3 – Cracks location – Bottom view . 9
Figure 4 – Dimension W . 10
Figure 5 – Flash and pull-out location . 11
Figure 6 – Pull-out in clamping recess area . 11
Figure 7 – Crystallites location for RM-core . 11
Figure 8 – Pores location for RM-core . 12

Table 1 – Relevant subclauses for given irregularity versus location . 5
Table 2 – Allowable chipping areas . 6
Table 3 – Area and length references for visual inspection . 8
Table 4 – Limits for cracks . 10
Table 5 – W dimensions . 10

IEC 60424-2:2015 © IEC 2015 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON THE LIMITS
OF SURFACE IRREGULARITIES –
Part 2: RM-cores
FOREWORD
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