SIST EN IEC 63093-10:2023
(Main)Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 10: PM-cores and associated parts
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 10: PM-cores and associated parts
IEC 63093-10:2022 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of PM-cores made of magnetic oxides, the main dimensions for coil formers to be used with these cores and the locations of their pins on a modular printed wiring grid in relation to the base outlines of cores. It also specifies the effective parameter values to be used in calculations and gives guidelines on allowable limits of surface irregularities applicable to the PM-cores.
Ferritkerne – Richtlinien zu Maßen und Grenzen von Oberfächenbeschädigungen – Teil 10: PM-Kerne und zugehörige Teile
Noyaux ferrites - Lignes directrices relatives aux dimensions et aux limites des irrégularités de surface - Partie 10: Noyaux PM et parties associées
L'IEC 63093-10:2022 spécifie les dimensions qui jouent un rôle majeur dans l'interchangeabilité mécanique d'une gamme préférentielle de noyaux PM constitués d'oxydes magnétiques, les dimensions principales des supports de bobine à utiliser avec ces noyaux et les emplacements de leurs broches sur une grille d'un circuit imprimé modulaire par rapport aux encombrements de base des noyaux. Elle spécifie également les valeurs des paramètres effectifs à utiliser dans les calculs et les lignes directrices relatives aux limites admissibles pour les irrégularités de surface applicables aux noyaux PM.
Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti - 10. del: PM-jedra in pripadajoči deli
Standard IEC 63093-10:2022 določa mere, ki so pomembne za mehansko medsebojno zamenljivost prednostnega razpona feritnih Pm-jeder iz magnetnih oksidov, bistvene mere tuljave, ki se uporablja s temi jedri, ter položaje njihovih priključkov na modularni mreži tiskanega vezja glede na osnovno sestavo jeder. Določa tudi vrednosti efektivnih parametrov, ki se uporabljajo pri izračunih, in podaja smernice glede omejitev površinskih nepravilnosti, ki veljajo za PM-jedra.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN IEC 63093-10:2023
01-maj-2023
Nadomešča:
SIST EN 61247:2002
Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti -
10. del: PM-jedra in pripadajoči deli
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 10:
PM-cores and associated parts
Ferritkerne – Richtlinien zu Maßen und Grenzen von Oberfächenbeschädigungen – Teil
10: PM-Kerne und zugehörige Teile
Noyaux ferrites - Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface - Partie 10: Noyaux PM et parties associées
Ta slovenski standard je istoveten z: EN IEC 63093-10:2022
ICS:
29.100.10 Magnetne komponente Magnetic components
SIST EN IEC 63093-10:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN IEC 63093-10:2023
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SIST EN IEC 63093-10:2023
EUROPEAN STANDARD EN IEC 63093-10
NORME EUROPÉENNE
EUROPÄISCHE NORM May 2022
ICS 29.100.10 Supersedes EN 61247:1997
English Version
Ferrite cores - Guidelines on dimensions and the limits of
surface irregularities - Part 10: PM-cores and associated parts
(IEC 63093-10:2022)
Noyaux ferrites - Lignes directrices relatives aux Ferritkerne - Richtlinien zu Maßen und Grenzen von
dimensions et aux limites des irrégularités de surface - Oberfächenbeschädigungen - Teil 10: PM-Kerne und
Partie 10: Noyaux PM et parties associées zugehörige Teile
(IEC 63093-10:2022) (IEC 63093-10:2022)
This European Standard was approved by CENELEC on 2022-05-26. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2022 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 63093-10:2022 E
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SIST EN IEC 63093-10:2023
EN IEC 63093-10:2022 (E)
European foreword
The text of document 51/1388/CDV, future edition 1 of IEC 63093-10, prepared by IEC/TC 51
"Magnetic components, ferrite and magnetic powder materials" was submitted to the IEC-CENELEC
parallel vote and approved by CENELEC as EN IEC 63093-10:2022.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-02-26
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2025-05-26
document have to be withdrawn
This document supersedes EN 61247:1997 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 63093-10:2022 was approved by CENELEC as a European
Standard without any modification.
2
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SIST EN IEC 63093-10:2023
EN IEC 63093-10:2022 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the
relevant EN/HD applies.
NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60205 - Calculation of the effective parameters of EN 60205 -
magnetic piece parts
IEC 60401-1 - Terms and nomenclature for cores made of EN IEC 60401-1 -
magnetically soft ferrites - Part 1: Terms
used for physical irregularities and
reference of dimensions
IEC 63093-1 2020 Ferrite cores - Guidelines on dimensions EN IEC 63093-1 2020
and the limits of surface irregularities - Part
1: General specification
3
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SIST EN IEC 63093-10:2023
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SIST EN IEC 63093-10:2023
IEC 63093-10
®
Edition 1.0 2022-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 10: PM-cores and associated parts
Noyaux ferrites – Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface –
Partie 10: Noyaux PM et parties associées
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-5523-0
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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SIST EN IEC 63093-10:2023
– 2 – IEC 63093-10:2022 © IEC 2022
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Primary dimensions . 6
4.1 General . 6
4.2 Dimensions of PM-cores . 7
4.2.1 Principal dimensions . 7
4.2.2 Effective parameter and A values . 8
min
4.3 Main dimensions of coil formers . 8
4.4 Pin locations and base outlines . 9
4.5 Pin diameter . 9
5 Mounting hardware . 9
6 Limits of surface irregularities . 10
6.1 General . 10
6.2 Examples of surface irregularities . 10
6.3 Chips and ragged edges . 11
6.3.1 General . 11
6.3.2 Chips and ragged edges located on the mating surface . 11
6.3.3 Chips and ragged edges located on other surfaces . 12
6.4 Cracks . 12
6.5 Pull-out . 13
6.6 Crystallites . 14
6.7 Flash . 14
6.8 Pores . 15
Annex A (normative) Derived standards . 16
Annex B (normative) Example of a gauge to check the coil former space dimensions of
PM‑cores meeting the IEC primary standard . 17
Annex C (informative) Recommended main dimensions for mounting hardware . 18
Annex D (informative) Limits of allowable chipping areas . 20
Figure 1 – Main dimensions of PM-cores . 7
Figure 2 – Main dimensions of coil formers . 8
Figure 3 – Pin locations and base outlines viewed from the underside of the board . 10
Figure 4 – Examples of surface irregularities . 11
Figure 5 – Chips on mating surfaces . 12
Figure 6 – Locations of cracks . 13
Figure 7 – Location of pull-out . 14
Figure 8 – Location of a crystallite . 14
Figure 9 – Location of a flash . 15
Figure 10 – Location of pore . 15
Figure B.1 – Example of a gauge . 17
Figure C.1 – Main dimensions of mounting hardware . 18
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SIST EN IEC 63093-10:2023
IEC 63093-10:2022 © IEC 2022 – 3 –
Table 1 – Main dimensions of PM-cores . 7
Table 2 – Effective parameter and A values . 8
min
Table 3 – Main dimensions of coil formers . 9
Table 4 – Limits for cracks . 13
Table B.1 – Example of a gauge . 17
Table C.1 – Main dimensions of U-bolt . 18
Table C.2 – Main dimensions of base plate . 19
Table D.1 – Limits of allowable chipping areas. 20
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SIST EN IEC 63093-10:2023
– 4 – IEC 63093-10:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 10: PM-cores and associated parts
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 this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
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.
IEC 63093-10 has been prepared by IEC technical committee 51: Magnetic components, ferrite
and magnetic powder materials. It is an International Standard.
This first edition cancels and replaces the first edition IEC 61247 published in 1995. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the first edition
of IEC 61247:
a) the calculations of the effective parameter values have been updated according to
IEC 60205;
b) added the limits of surface irregularities.
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SIST EN IEC 63093-10:2023
IEC 63093-10:2022 © IEC 2022 – 5 –
The text of this Inter
...
SLOVENSKI STANDARD
oSIST prEN IEC 63093-10:2021
01-december-2021
Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti -
10. del: PM-jedra in pripadajoči deli
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 10:
PM-cores and associated parts
Noyaux ferrites - Lignes directrices relatives aux dimensions et aux limites des
irrégularités de surface - Partie 10: Noyaux PM et parties associées
Ta slovenski standard je istoveten z: prEN IEC 63093-10:2021
ICS:
29.100.10 Magnetne komponente Magnetic components
oSIST prEN IEC 63093-10:2021 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN IEC 63093-10:2021
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oSIST prEN IEC 63093-10:2021
51/1388/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 63093-10 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-10-15 2022-01-07
SUPERSEDES DOCUMENTS:
51/1374/CD, 51/1385/CC
IEC TC 51 : MAGNETIC COMPONENTS, FERRITE AND MAGNETIC POWDER MATERIALS
SECRETARIAT: SECRETARY:
Japan Mr Takeshi Abe
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any,
in this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for
Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.
TITLE:
Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 10: PM-cores and
associated parts
PROPOSED STABILITY DATE: 2027
NOTE FROM TC/SC OFFICERS:
Copyright © 2021 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
permission in writing from IEC.
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oSIST prEN IEC 63093-10:2021
IEC CDV 63093-10 © IEC 2021 - 2 - 51/1388/CDV
1 CONTENTS
2
3 FOREWORD . 4
4 1 Scope . 6
5 2 Normative references . 6
6 3 Terms and definitions . 6
7 4 Primary dimensions . 6
8 4.1 General . 6
9 4.2 Dimensions of PM-cores . 6
10 4.2.1 Principal dimensions . 6
11 4.2.2 Effective parameter and Amin values . 7
12 4.3 Main dimensions of coil formers . 8
13 4.4 Pin locations and base outlines . 9
14 4.5 Pin diameter . 9
15 5 Mounting hardware . 9
16 6 Limits of surface irregularities . 10
17 6.1 General . 10
18 6.2 Examples of surface irregularities . 10
19 6.3 Chips and ragged edges . 11
20 6.3.1 General . 11
21 6.3.2 Chips and ragged edges located on the mating surface . 11
22 6.3.3 Chips and ragged edges located on other surfaces . 12
23 6.4 Cracks . 12
24 6.5 Pull-out . 13
25 6.6 Crystallites . 13
26 6.7 Flash . 13
27 6.8 Pores . 14
28 Annex A (normative) Derived standards . 15
29 Annex B (normative) Example of a gauge to check the coil former space dimensions
30 of PM-cores meeting the IEC primary standard . 16
31 Annex C (informative) Recommended main dimensions for mounting hardware . 17
32 Annex D (informative) Limits for allowable chipping areas . 19
33
34 Figure 1 – The main dimensions of PM-cores . 7
35 Figure 2 – Main dimensions of coil formers . 8
36 Figure 3 – Pin locations and base outlines viewed from the underside of the board . 10
37 Figure 4 – Examples of surface irregularities . 11
38 Figure 5 – Chips on mating surfaces . 11
39 Figure 6 – Location of cracks . 12
40 Figure 7 – Location of pull-out . 13
41 Figure 8 – Location of a crystallite . 13
42 Figure 9 – Location of a flash . 14
43 Figure 10 – Location of pore . 14
44 Figure B.1 – Example of a gauge . 16
45 Figure C.1 – Main dimensions of mounting hardware . 17
46
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oSIST prEN IEC 63093-10:2021
51/1388/CDV – 3 – IEC CDV 63093-10 © IEC 2021
47 Table 1 – The main dimensions of PM-cores . 7
48 Table 2 – Effective parameter and A values . 8
min
49 Table 3 – Main dimensions of coil formers . 8
50 Table 4 – Limits for cracks . 12
51 Table B.1 – Example of a gauge . 16
52 Table C.1 – Main dimensions of U-bolt. 17
53 Table C.2 – Main dimensions of base plate . 18
54 Table D.1 – Limits for allowable chipping areas (refer to the IEC 63093-13). 19
55
56
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oSIST prEN IEC 63093-10:2021
IEC CDV 63093-10 © IEC 2021 – 4 – 51/1388/CDV
57 INTERNATIONAL ELECTROTECHNICAL COMMISSION
58 ____________
59
60 FERRITE CORES – GUIDELINES ON DIMENSIONS
61 AND THE LIMITS OF SURFACE IRREGULARITIES –
62
63 Part 10: PM-cores and associated parts
64
65
66 FOREWORD
67 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
68 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
69 international co-operation on all questions concerning standardization in the electrical and electronic fields. To
70 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
71 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
72 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
73 in the subject dealt with may participate in this preparatory work. International, governmental and non-
74 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
75 with the International Organization for Standardization (ISO) in accordance with conditions determined by
76 agreement between the two organizations.
77 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
78 consensus of opinion on the relevant subjects since each technical committee has representation from all
79 interested IEC National Committees.
80 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
81 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
82 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
83 misinterpretation by any end user.
84 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
85 transparently to the maximum extent possible in their national and regional publications. Any divergence
86 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
87 the latter.
88 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
89 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
90 services carried out by independent certification bodies.
91 6) All users should ensure that they have the latest edition of this publication.
92 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
93 members of its technical committees and IEC National Committees for any personal injury, property damage or
94 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
95 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
96 Publications.
97 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
98 indispensable for the correct application of this publication.
99 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
100 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
101 IEC 63093-10 has been prepared by IEC technical committee 51: Magnetic components,
102 ferrite and magnetic powder materials. It is an International Standard.
103 This first edition cancels and replaces the first edition of IEC 61247 published in 1995. This
104 edition constitutes a technical revision.
105 This edition includes the following significant technical changes with respect to IEC 61247:
106 a) The calculations of the effective parameter values have been updated according to the
107 IEC 60205.
108 b) Add the limits of surface irregularities.
109 The text of this International Standard is based on the following documents:
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oSIST prEN IEC 63093-10:2021
51/1388/CDV – 5 – IEC CDV 63093-10 © IEC 2021
FDIS Report on voting
XX/XX/FDIS XX/XX/RVD
110 Full information on the voting for its approval can be found in the report on voting indicated in
111 the above table.
112 The language used for the development of this International Standard is English.
113 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
114 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,
115 available at www.iec.ch/members_experts/refdocs. The main document types developed by
116 IEC are described in greater detail at http://www.iec.ch/standardsdev/publications.
117 A list of all parts in the IEC 63093 series, published under the general title Ferrite cores –
118 Guidelines on dimensions and the limits of surface irregularities can be found on the IEC
119 website.
120 The committee has decided that the contents of this document will remain unchanged until the
121 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
122 specific document. At this date, the document will be
123 • reconfirmed,
124 • withdrawn,
125 • replaced by a revised edition, or
126 • amended.
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oSIST prEN IEC 63093-10:2021
IEC CDV 63093-10 © IEC 2021 – 6 – 51/1388/CDV
127 FERRITE CORES – GUIDELINES ON DIMENSIONS
128 AND THE LIMITS OF SURFACE IRREGULARITIES –
129
130 Part 10: PM-cores and associated parts
131
132 1 Scope
133 This part of IEC 63093 specifies the dimensions that are of importance for mechanical
134 interchangeability for a preferred range of PM-cores made of magnetic oxides, the main
135 dimensions for coil formers to be used with these cores and the locations of their pins on a
136 modular printed wiring grid in relation to the base outlines of cores. It also specifies the
137 effective parameter values to be used in calculations and gives guidelines on allowable limits
138 of surface irregularities applicable to the PM-cores.
139 The use of derived standards which give a more detailed specification of component parts
140 whilst still permitting compliance with this standard is discussed in Annex A.
141 2 Normative references
142 The following documents are referred to in the text in such a way that some or all of their
143 content constitutes requirements of this document. For dated refere
...
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