Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 8: E-cores

This part of IEC 63093 specifies the dimensions that are of importance for mechanical
interchangeability for a preferred range of E-cores made of ferrite and the essential
dimensions of coil formers to be used with them, as well the effective parameter values to be
used in calculations involving them. It also gives guidelines on allowable limits of surface
irregularities applicable to E-cores.
The specifications contained in this document are useful in negotiations between ferrite core
manufacturers and customers about surface irregularities.
The use of derived standards, which give more detailed specifications of component parts
while still permitting compliance with this standard, is discussed in Annex A.

Ferritkerne – Richtlinien zu Maßen und Grenzen von Oberflächenbeschädigungen – Teil 8: E-Kerne

Noyaux ferrites - Lignes directrices relatives aux dimensions et limites des irrégularités de surface - Partie 8 : Noyaux E

Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti - 8. del: E-jedra

Ta del standarda IEC 63093 določa mere, ki so pomembne za mehansko medsebojno zamenljivost prednostnega razpona E-jeder, bistvene mere tuljave, ki se uporablja s temi jedri, in vrednosti efektivnih parametrov, ki se uporabljajo pri izračunih, povezanih z jedri. Podaja tudi smernice glede omejitev površinskih nepravilnosti, ki veljajo za E-jedra.
Specifikacije v tem dokumentu so uporabne za sklepanje dogovorov o površinskih nepravilnostih med proizvajalci in uporabniki feritnih jeder.
Uporaba izpeljanih standardov, ki podajajo podrobnejše specifikacije o delih komponent in hkrati dovoljujejo skladnost s tem standardom, je obravnavana v dodatku A.

General Information

Status
Published
Publication Date
11-Aug-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Jul-2019
Due Date
16-Sep-2019
Completion Date
12-Aug-2019

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SLOVENSKI STANDARD
SIST EN IEC 63093-8:2019
01-september-2019
Nadomešča:
SIST EN 60424-3:2016
SIST EN 62317-8:2007

Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti -

8. del: E-jedra

Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 8:

E-cores
Ta slovenski standard je istoveten z: EN IEC 63093-8:2018
ICS:
29.100.10 Magnetne komponente Magnetic components
SIST EN IEC 63093-8:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 63093-8:2019
---------------------- Page: 2 ----------------------
SIST EN IEC 63093-8:2019
EUROPEAN STANDARD EN IEC 63093-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2018
ICS 29.100.10 Supersedes EN 60424-3:2016 (partially), EN 62317-
8:2006
English Version
Ferrite cores - Guidelines on dimensions and the limits of
surface irregularities - Part 8: E-cores
(IEC 63093-8:2018)

Noyaux ferrites - Lignes directrices relatives aux Ferritkerne - Richtlinien zu Maßen und Grenzen von

dimensions et limites des irrégularités de surface - Partie 8 : Oberflächenbeschädigungen - Teil 8: E-Kerne

Noyaux E (IEC 63093-8:2018)
(IEC 63093-8:2018)

This European Standard was approved by CENELEC on 2018-06-04. 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, 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

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 63093-8:2018 E
---------------------- Page: 3 ----------------------
SIST EN IEC 63093-8:2019
EN IEC 63093-8:2018 (E)
European foreword

The text of document 51/1213/CDV, future edition 1 of IEC 63093-8, 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 63093-8:2018.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2018-03-28

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2021-09-28

document have to be withdrawn
This document supersedes EN 62317-8:2006.
This document together with EN IEC 63093-6:2018, EN IEC 63083-7:2018 and
EN IEC 63093-11:2018 supersedes EN 60424-3:2015.

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.

Endorsement notice

The text of the International Standard IEC 63093-8:2018 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 60424-3:2015 NOTE Harmonized as EN 60424-3:2016 (not modified)
IEC 62317-8:2006 NOTE Harmonized as EN 62317-8:2006 (not modified)
---------------------- Page: 4 ----------------------
SIST EN IEC 63093-8:2019
EN IEC 63093-8:2018 (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 60401-1 -
magnetically soft ferrites - Part 1: Terms
used for physical irregularities
IEC 60424-1 - Ferrite cores - Guidelines on the limits of EN 60424-1 -
surface irregularities - Part 1: General
specification
---------------------- Page: 5 ----------------------
SIST EN IEC 63093-8:2019
---------------------- Page: 6 ----------------------
SIST EN IEC 63093-8:2019
IEC 63093-8
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 8: E-cores
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-5835-4

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 7 ----------------------
SIST EN IEC 63093-8:2019
– 2 – IEC 63093-8:2018 © IEC 2018
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 E-cores ............................................................................................ 7

4.2.1 Main dimensions .............................................................................................. 7

4.2.2 Effective parameter and A values ............................................................... 9

min

4.3 Dimensional limits for coil formers ........................................................................ 11

5 Limits of surface irregularities ........................................................................................ 15

5.1 General ................................................................................................................. 15

5.2 Examples of surface irregularities ......................................................................... 15

5.3 Chips and ragged edges ....................................................................................... 15

5.3.1 General ......................................................................................................... 15

5.3.2 Chips and ragged edges on the mating surfaces ............................................ 15

5.3.3 Chips and ragged edges on the other surfaces .............................................. 15

5.4 Cracks .................................................................................................................. 18

5.5 Flash .................................................................................................................... 18

5.6 Pull-outs ............................................................................................................... 18

5.7 Crystallites ............................................................................................................ 19

5.8 Pores .................................................................................................................... 19

Annex A (normative) Derived standards ............................................................................... 21

Annex B (normative) Example of dimensions for gauges to check the dimensions of

E-cores complying with this document .................................................................................. 22

B.1 General ................................................................................................................. 22

B.2 Procedure and requirements ................................................................................. 24

Annex C (informative) Reference of allowable areas of chips ............................................... 25

Bibliography .......................................................................................................................... 26

Figure 1 – Dimensions of E-cores with rectangular cross-section ............................................ 7

Figure 2 – Main dimensions of coil formers ........................................................................... 12

Figure 3 – Examples of surface irregularities ........................................................................ 15

Figure 4 – Chip location for E-cores ...................................................................................... 16

Figure 5 – Crack and pull-out locations for E-cores ............................................................... 18

Figure 6 – Crystallite location for E-cores ............................................................................. 19

Figure 7 – Pore location for E-cores ...................................................................................... 20

Figure B.1 – Gauge dimensions ............................................................................................ 22

Table 1 – Dimensions of E-cores with rectangular cross-section ............................................. 8

Table 2 – Effective parameter and A values ..................................................................... 10

min

Table 3 – Dimensional limits for coil formers ......................................................................... 13

Table 4 – Area and length reference for visual inspection ..................................................... 17

Table 5 – Limits for cracks .................................................................................................... 19

---------------------- Page: 8 ----------------------
SIST EN IEC 63093-8:2019
IEC 63093-8:2018 © IEC 2018 – 3 –

Table B.1 – Gauge dimensions ............................................................................................. 23

Table C.1 – Allowable areas of chips for E-cores .................................................................. 25

---------------------- Page: 9 ----------------------
SIST EN IEC 63093-8:2019
– 4 – IEC 63093-8:2018 © IEC 2018
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 8: E-cores
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.

International Standard IEC 63093-8 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This first edition cancels and replaces the first edition of IEC 62317-8 published in 2006 and

the second edition of IEC 60424-3 published in 2015. This edition constitutes a technical

revision.

This edition includes the following significant technical changes with respect to

IEC 62317-8:2006 and IEC 60424-3:2015:
a) This document integrates IEC 62317-8:2006 and IEC 60424-3:2015;

b) Table 4 – Allowable areas of chips for E-cores, of IEC 60424-3:2015, has been moved to

Annex C (informative) of this document.
---------------------- Page: 10 ----------------------
SIST EN IEC 63093-8:2019
IEC 63093-8:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1213/CDV 51/1235/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 63093 series, published under the general title Ferrite cores –

Guidelines on dimensions and the limits of surface irregularities, can be found on the IEC

website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 11 ----------------------
SIST EN IEC 63093-8:2019
– 6 – IEC 63093-8:2018 © IEC 2018
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 8: E-cores
1 Scope

This part of IEC 63093 specifies the dimensions that are of importance for mechanical

interchangeability for a preferred range of E-cores made of ferrite and the essential

dimensions of coil formers to be used with them, as well the effective parameter values to be

used in calculations involving them. It also gives guidelines on allowable limits of surface

irregularities applicable to E-cores.

The specifications contained in this document are useful in negotiations between ferrite core

manufacturers and customers about surface irregularities.

The use of derived standards, which give more detailed specifications of component parts

while still permitting compliance with this standard, is discussed in Annex A.
2 Normative references

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.
IEC 60205, Calculation of the effective parameters of magnetic piece parts

IEC 60401-1, Terms and nomenclature for cores made of magnetically soft ferrites – Part 1:

Terms used for physical irregularities

IEC 60424-1, Ferrite cores – Guidelines on the limits of surface irregularities – Part 1:

General specification
3 Terms and definitions

For the purpose of this document, the terms and definitions given in IEC 60401-1 and

IEC 60424-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Primary dimensions
4.1 General

Compliance with the following requirements ensures mechanical interchangeability of

complete assemblies and coil formers.
---------------------- Page: 12 ----------------------
SIST EN IEC 63093-8:2019
IEC 63093-8:2018 © IEC 2018 – 7 –
4.2 Dimensions of E-cores
4.2.1 Main dimensions

The main dimensions of E-cores with rectangular cross-section shall be those given in Table 1.

The dimensions of the cores can be checked by means of gauges, an example of which is

given in Annex B. In order to facilitate production it can be necessary to use gauges with

dimensions differing from those given in Annex B, although no relaxation of the requirements

for the dimensions of the cores given in Table 1 is thereby permitted. The dimensions

specified in Table 1 are illustrated in Figure 1.
D C
IEC
Figure 1 – Dimensions of E-cores with rectangular cross-section
---------------------- Page: 13 ----------------------
– 8 – IEC 63093-8:2018 © IEC 2018
SIST EN IEC 63093-8:2019
Table 1 – Dimensions of E-cores with rectangular cross-section
A B C D E F
IEC 61246 Industrial
Size mm mm mm mm mm mm
references references
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.

E5,3/2 5,15 5,35 2,57 2,73 1,90 2,00 1,92 2,08 3,80 4,00 1,30 1,40 E5,3/2 FEE5,25; EE5

E6,3/2 6,05 6,30 2,80 2,90 1,90 2,00 1,85 2,05 3,60 3,80 1,30 1,40 E6,3/2 FEE6,18

E8/2 7,85 8,15 3,95 4,05 2,30 2,40 2,85 2,95 5,60 5,80 2,30 2,40 E8/2 FEE8
E8,3/4 8,10 8,60 3,90 4,10 3,40 3,80 2,90 3,10 6,10 6,50 1,60 2,00 FEE8,3; EE8
E8,8/2 8,60 9,40 3,85 4,15 1,78 2,02 2,03 2,40 5,07 5,33 1,78 2,02 E8,8/2 FEE9
E10/3 9,80 10,2 4,88 5,00 2,88 3,00 3,50 3,62 7,00 7,30 2,88 3,00 E10/3 FEE10
E10,
...

SLOVENSKI STANDARD
SIST EN IEC 63093-8:2019
01-september-2019
Nadomešča:
SIST EN 60424-3:2016
SIST EN 62317-8:2007

Feritna jedra - Smernice o merah in mejnih vrednostih površinskih nepravilnosti -

8. del: E-jedra

Ferrite cores - Guidelines on dimensions and the limits of surface irregularities - Part 8:

E-cores
Ta slovenski standard je istoveten z: EN IEC 63093-8:2018
ICS:
29.100.10 Magnetne komponente Magnetic components
SIST EN IEC 63093-8:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD EN IEC 63093-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2018
ICS 29.100.10 Supersedes EN 60424-3:2016 (partially), EN 62317-
8:2006
English Version
Ferrite cores - Guidelines on dimensions and the limits of
surface irregularities - Part 8: E-cores
(IEC 63093-8:2018)

Noyaux ferrites - Lignes directrices relatives aux Ferritkerne - Richtlinien zu Maßen und Grenzen von

dimensions et limites des irrégularités de surface - Partie 8 : Oberflächenbeschädigungen - Teil 8: E-Kerne

Noyaux E (IEC 63093-8:2018)
(IEC 63093-8:2018)

This European Standard was approved by CENELEC on 2018-06-04. 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, 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

© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 63093-8:2018 E
---------------------- Page: 2 ----------------------
EN IEC 63093-8:2018 (E)
European foreword

The text of document 51/1213/CDV, future edition 1 of IEC 63093-8, 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 63093-8:2018.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2018-03-28

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2021-09-28

document have to be withdrawn
This document supersedes EN 62317-8:2006.
This document together with EN IEC 63093-6:2018, EN IEC 63083-7:2018 and
EN IEC 63093-11:2018 supersedes EN 60424-3:2015.

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.

Endorsement notice

The text of the International Standard IEC 63093-8:2018 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 60424-3:2015 NOTE Harmonized as EN 60424-3:2016 (not modified)
IEC 62317-8:2006 NOTE Harmonized as EN 62317-8:2006 (not modified)
---------------------- Page: 3 ----------------------
EN IEC 63093-8:2018 (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 60401-1 -
magnetically soft ferrites - Part 1: Terms
used for physical irregularities
IEC 60424-1 - Ferrite cores - Guidelines on the limits of EN 60424-1 -
surface irregularities - Part 1: General
specification
---------------------- Page: 4 ----------------------
IEC 63093-8
Edition 1.0 2018-06
INTERNATIONAL
STANDARD
Ferrite cores – Guidelines on dimensions and the limits of surface
irregularities –
Part 8: E-cores
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.100.10 ISBN 978-2-8322-5835-4

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 5 ----------------------
– 2 – IEC 63093-8:2018 © IEC 2018
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 E-cores ............................................................................................ 7

4.2.1 Main dimensions .............................................................................................. 7

4.2.2 Effective parameter and A values ............................................................... 9

min

4.3 Dimensional limits for coil formers ........................................................................ 11

5 Limits of surface irregularities ........................................................................................ 15

5.1 General ................................................................................................................. 15

5.2 Examples of surface irregularities ......................................................................... 15

5.3 Chips and ragged edges ....................................................................................... 15

5.3.1 General ......................................................................................................... 15

5.3.2 Chips and ragged edges on the mating surfaces ............................................ 15

5.3.3 Chips and ragged edges on the other surfaces .............................................. 15

5.4 Cracks .................................................................................................................. 18

5.5 Flash .................................................................................................................... 18

5.6 Pull-outs ............................................................................................................... 18

5.7 Crystallites ............................................................................................................ 19

5.8 Pores .................................................................................................................... 19

Annex A (normative) Derived standards ............................................................................... 21

Annex B (normative) Example of dimensions for gauges to check the dimensions of

E-cores complying with this document .................................................................................. 22

B.1 General ................................................................................................................. 22

B.2 Procedure and requirements ................................................................................. 24

Annex C (informative) Reference of allowable areas of chips ............................................... 25

Bibliography .......................................................................................................................... 26

Figure 1 – Dimensions of E-cores with rectangular cross-section ............................................ 7

Figure 2 – Main dimensions of coil formers ........................................................................... 12

Figure 3 – Examples of surface irregularities ........................................................................ 15

Figure 4 – Chip location for E-cores ...................................................................................... 16

Figure 5 – Crack and pull-out locations for E-cores ............................................................... 18

Figure 6 – Crystallite location for E-cores ............................................................................. 19

Figure 7 – Pore location for E-cores ...................................................................................... 20

Figure B.1 – Gauge dimensions ............................................................................................ 22

Table 1 – Dimensions of E-cores with rectangular cross-section ............................................. 8

Table 2 – Effective parameter and A values ..................................................................... 10

min

Table 3 – Dimensional limits for coil formers ......................................................................... 13

Table 4 – Area and length reference for visual inspection ..................................................... 17

Table 5 – Limits for cracks .................................................................................................... 19

---------------------- Page: 6 ----------------------
IEC 63093-8:2018 © IEC 2018 – 3 –

Table B.1 – Gauge dimensions ............................................................................................. 23

Table C.1 – Allowable areas of chips for E-cores .................................................................. 25

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 8: E-cores
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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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

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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 63093-8 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This first edition cancels and replaces the first edition of IEC 62317-8 published in 2006 and

the second edition of IEC 60424-3 published in 2015. This edition constitutes a technical

revision.

This edition includes the following significant technical changes with respect to

IEC 62317-8:2006 and IEC 60424-3:2015:
a) This document integrates IEC 62317-8:2006 and IEC 60424-3:2015;

b) Table 4 – Allowable areas of chips for E-cores, of IEC 60424-3:2015, has been moved to

Annex C (informative) of this document.
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IEC 63093-8:2018 © IEC 2018 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
51/1213/CDV 51/1235/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 63093 series, published under the general title Ferrite cores –

Guidelines on dimensions and the limits of surface irregularities, can be found on the IEC

website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
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FERRITE CORES – GUIDELINES ON DIMENSIONS
AND THE LIMITS OF SURFACE IRREGULARITIES –
Part 8: E-cores
1 Scope

This part of IEC 63093 specifies the dimensions that are of importance for mechanical

interchangeability for a preferred range of E-cores made of ferrite and the essential

dimensions of coil formers to be used with them, as well the effective parameter values to be

used in calculations involving them. It also gives guidelines on allowable limits of surface

irregularities applicable to E-cores.

The specifications contained in this document are useful in negotiations between ferrite core

manufacturers and customers about surface irregularities.

The use of derived standards, which give more detailed specifications of component parts

while still permitting compliance with this standard, is discussed in Annex A.
2 Normative references

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.
IEC 60205, Calculation of the effective parameters of magnetic piece parts

IEC 60401-1, Terms and nomenclature for cores made of magnetically soft ferrites – Part 1:

Terms used for physical irregularities

IEC 60424-1, Ferrite cores – Guidelines on the limits of surface irregularities – Part 1:

General specification
3 Terms and definitions

For the purpose of this document, the terms and definitions given in IEC 60401-1 and

IEC 60424-1 apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Primary dimensions
4.1 General

Compliance with the following requirements ensures mechanical interchangeability of

complete assemblies and coil formers.
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IEC 63093-8:2018 © IEC 2018 – 7 –
4.2 Dimensions of E-cores
4.2.1 Main dimensions

The main dimensions of E-cores with rectangular cross-section shall be those given in Table 1.

The dimensions of the cores can be checked by means of gauges, an example of which is

given in Annex B. In order to facilitate production it can be necessary to use gauges with

dimensions differing from those given in Annex B, although no relaxation of the requirements

for the dimensions of the cores given in Table 1 is thereby permitted. The dimensions

specified in Table 1 are illustrated in Figure 1.
D C
IEC
Figure 1 – Dimensions of E-cores with rectangular cross-section
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– 8 – IEC 63093-8:2018 © IEC 2018
Table 1 – Dimensions of E-cores with rectangular cross-section
A B C D E F
IEC 61246 Industrial
Size mm mm mm mm mm mm
references references
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.

E5,3/2 5,15 5,35 2,57 2,73 1,90 2,00 1,92 2,08 3,80 4,00 1,30 1,40 E5,3/2 FEE5,25; EE5

E6,3/2 6,05 6,30 2,80 2,90 1,90 2,00 1,85 2,05 3,60 3,80 1,30 1,40 E6,3/2 FEE6,18

E8/2 7,85 8,15 3,95 4,05 2,30 2,40 2,85 2,95 5,60 5,80 2,30 2,40 E8/2 FEE8
E8,3/4 8,10 8,60 3,90 4,10 3,40 3,80 2,90 3,10 6,10 6,50 1,60 2,00 FEE8,3; EE8
E8,8/2 8,60 9,40 3,85 4,15 1,78 2,02 2,03 2,40 5,07 5,33 1,78 2,02 E8,8/2 FEE9
E10/3 9,80 10,2 4,88 5,00 2,88 3,00 3,50 3,62 7,00 7,30 2,88 3,00 E10/3 FEE10
E10,2/5 10,0
...

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