Fixed inductors for electromagnetic interference suppression - Part 2: Sectional specification on power line chokes

IEC 60938-2:2021 applies to fixed inductors designed for electromagnetic interference suppression, which will be connected to an AC mains or other supply with a nominal voltage not exceeding 1 000 V AC RMS or 1 500 V DC with a nominal frequency not exceeding 400 Hz.
This sectional specification is restricted to fixed inductors for which safety tests are appropriate. This implies that inductors specified according to this specification will either be connected to mains supplies, when compliance with the mandatory tests of Annex A is necessary, or used in other circuit positions where the equipment specification prescribes that some or all of these safety tests are required.
The object of this document is to prescribe standard requirements for safety tests, preferred ratings and characteristics, to select from IEC 60938-1 the appropriate methods of test and to give general performance requirements for suppression inductors.
This edition includes the following significant technical changes with respect to the previous edition:
- the test plan for performance testing has been removed; mandatory safety tests and optional performance tests are listed in one test plan in Annex B;
- requirements for Thyristor-Chokes have been withdrawn;
- material requirements are harmonized with IEC 60939-3 and UL 60939-3;
- AC chokes up to 1 000 V and DC chokes up to 1 500 V are now in the Scope.

Inductances fixes d'antiparasitage - Partie 2: Spécification intermédiaire sur les bobines d’arrêt pour ligne électrique

L'IEC 60938-2:2021 s'applique à des inductances fixes conçues pour s’opposer aux perturbations électromagnétiques, qui sont connectées à un réseau d’alimentation à courant alternatif ou à une autre source d’alimentation dont la tension nominale ne dépasse pas 1 000 V (valeur eff.) en courant alternatif ou 1 500 V en courant continu avec une fréquence nominale qui ne dépasse pas 400 Hz.
La présente spécification intermédiaire se limite à des inductances fixes pour lesquelles des essais de sécurité sont souhaitables. Cela signifie que les inductances décrites conformément à la présente spécification sont, soit reliées à l'alimentation secteur, lorsque la conformité aux essais obligatoires de l’Annexe A est nécessaire, soit utilisées en d'autres positions du circuit pour lesquelles la spécification applicable à l'équipement indique que certains ou l'ensemble de ces essais de sécurité sont exigés.
Le présent document a pour objet de prescrire des exigences normalisées d'essais de sécurité ainsi que des valeurs assignées et caractéristiques préférentielles, qui permettent de choisir à partir de l’IEC 60938-1 les méthodes d'essai appropriées et de fournir des exigences générales de performance applicables aux inductances d'antiparasitage.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente.
- le programme d’essai pour les essais de performance a été supprimé; les essais de sécurité obligatoires et les essais de performance facultatifs sont énumérés dans un seul programme d’essai à l’Annexe B;
- les exigences relatives aux bobines d’arrêt à thyristor ont été supprimées;
- les exigences relatives aux matériaux sont alignées sur les normes IEC 60939-3 et UL 60939-3;
- les bobines d’arrêt à courant alternatif d’une tension jusqu’à 1 000 V et les bobines d’arrêt à courant continu d’une tension jusqu’à 1 500 V sont désormais incluses dans le Domaine d’application.

General Information

Status
Published
Publication Date
19-Jul-2021
Current Stage
PPUB - Publication issued
Completion Date
20-Jul-2021
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IEC 60938-2
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fixed inductors for electromagnetic interference suppression –
Part 2: Sectional specification on power line chokes
Inductances fixes d’antiparasitage –

Partie 2: Spécification intermédiaire sur les bobines d’arrêt pour ligne électrique

IEC 60938-2:2021-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60938-2
Edition 3.0 2021-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Fixed inductors for electromagnetic interference suppression –
Part 2: Sectional specification on power line chokes
Inductances fixes d’antiparasitage –

Partie 2: Spécification intermédiaire sur les bobines d’arrêt pour ligne électrique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10; 31.020 ISBN 978-2-8322-1002-2

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
---------------------- Page: 3 ----------------------
– 2 – IEC 60938-2:2021 © IEC 2021
CONTENTS

FOREWORD ........................................................................................................................... 5

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 General requirements ...................................................................................................... 9

4.1 General ................................................................................................................... 9

4.2 Preferred values of ratings and characteristics ........................................................ 9

4.2.1 Climatic categories .......................................................................................... 9

4.2.2 Nominal inductance and tolerance ................................................................... 9

4.2.3 Rated voltage U ............................................................................................. 9

4.2.4 Rated temperature T ....................................................................................... 9

4.2.5 Rated current I ............................................................................................. 10

4.3 Information to be given in a detail specification ..................................................... 10

4.3.1 General ......................................................................................................... 10

4.3.2 Outline drawing and dimensions .................................................................... 10

4.3.3 Mounting ....................................................................................................... 11

4.3.4 Ratings and characteristics ............................................................................ 11

4.4 Insulated inductors for power line applications ...................................................... 11

4.5 Marking ................................................................................................................. 11

5 Safety tests for approval ................................................................................................ 12

5.1 General ................................................................................................................. 12

5.1.1 Approval on the basis of the fixed sample size procedures ............................ 12

5.1.2 Structurally similar inductors .......................................................................... 12

5.1.3 Sampling ....................................................................................................... 13

5.2 Standard atmospheric conditions .......................................................................... 13

5.3 Visual examination ................................................................................................ 13

5.3.1 Dimensions (gauging) .................................................................................... 13

5.3.2 Dimensions (detail) ........................................................................................ 13

5.4 Insulation resistance ............................................................................................. 14

5.5 Voltage test .......................................................................................................... 14

5.6 Inductance ............................................................................................................ 15

5.7 Line resistance ..................................................................................................... 15

5.8 Insertion loss (optional) ......................................................................................... 15

5.9 Temperature rise (applies to inductors with a mass > 5 g only) ............................. 15

5.9.1 General ......................................................................................................... 15

5.9.2 Test method .................................................................................................. 15

5.9.3 Requirements ................................................................................................ 16

5.10 Impulse voltage (applies to inductors with more than one winding only) ................ 16

5.10.1 Test conditions .............................................................................................. 16

5.10.2 Initial measurements ..................................................................................... 16

5.10.3 Requirements ................................................................................................ 16

5.11 Endurance ............................................................................................................ 16

5.11.1 Test conditions – Endurance current test (applies to inductors with a

mass < 5 g only) ............................................................................................ 16

5.11.2 Test conditions – Endurance voltage test between terminations (applies

to inductors with more than one winding only) ................................................ 17

---------------------- Page: 4 ----------------------
IEC 60938-2:2021 © IEC 2021 – 3 –

5.11.3 Final inspection, measurements and requirements......................................... 17

5.12 Robustness of terminations ................................................................................... 17

5.12.1 General ......................................................................................................... 17

5.12.2 Test Ua1 – Tensile ........................................................................................ 18

5.12.3 Test Ub – Bending ......................................................................................... 18

5.12.4 Test Uc – Torsion .......................................................................................... 18

5.12.5 Test Ud – Torque ........................................................................................... 18

5.12.6 Test Ue – Robustness of terminations of SMD-components mounted on

PCB ............................................................................................................... 18

5.13 Vibration ............................................................................................................... 19

5.13.1 Test conditions .............................................................................................. 19

5.13.2 Requirements ................................................................................................ 19

5.14 Shock ................................................................................................................... 19

5.14.1 Test conditions .............................................................................................. 19

5.14.2 Requirements ................................................................................................ 20

5.15 Resistance to soldering heat ................................................................................. 20

5.16 Solderability (optional) .......................................................................................... 20

5.16.1 General ......................................................................................................... 20

5.16.2 Preconditioning .............................................................................................. 20

5.16.3 Test procedure .............................................................................................. 20

5.16.4 Final inspection, measurements and requirements......................................... 20

5.17 Rapid change of temperature (optional) ................................................................ 20

5.18 Container sealing (if applicable) ............................................................................ 21

5.19 Climatic sequence (optional) ................................................................................. 21

5.19.1 General ......................................................................................................... 21

5.19.2 Dry heat ........................................................................................................ 21

5.19.3 Damp heat, cyclic, test Db, first cycle ............................................................ 21

5.19.4 Cold............................................................................................................... 21

5.19.5 Low air pressure ............................................................................................ 21

5.19.6 Damp heat, cyclic, test Db, remaining cycles ................................................. 21

5.19.7 Final inspection, measurements and requirements......................................... 21

5.20 Damp heat, steady state ....................................................................................... 22

5.21 Passive flammability (optional) .............................................................................. 22

5.22 Glow wire (optional) .............................................................................................. 22

5.23 Ball pressure (optional) ......................................................................................... 23

5.24 Component solvent resistance .............................................................................. 23

5.25 Solvent resistance of marking ............................................................................... 23

Annex A (normative) Sampling plan ..................................................................................... 24

Annex B (normative) Test schedule...................................................................................... 25

Annex C (normative) Declaration of design .......................................................................... 28

Annex D (normative) Clearance ........................................................................................... 29

Annex E (normative) Creepage ............................................................................................ 30

Annex F (normative) Fully insulated winding wires ............................................................... 32

Annex X (informative) Cross-references for references to the previous edition of this

document .............................................................................................................................. 33

Bibliography .......................................................................................................................... 35

Figure 1 – Relation between ambient temperature and applied current ................................. 10

---------------------- Page: 5 ----------------------
– 4 – IEC 60938-2:2021 © IEC 2021

Table 1 – Test voltages ......................................................................................................... 14

Table 2 – Force for tensile stress on terminations ................................................................. 18

Table 3 – Torque .................................................................................................................. 18

Table 4 – Acceleration .......................................................................................................... 19

Table 5 – Sweep cycles ........................................................................................................ 19

Table 6 – Preferred severities ............................................................................................... 20

Table 7 – Severities and requirements for passive flammability............................................. 22

Table D.1 – Clearance distances .......................................................................................... 29

Table E.1 – Creepage distances ........................................................................................... 31

Table F.1 – FIW wires with their minimum test voltages ........................................................ 32

Table X.1 – Cross-references ............................................................................................... 33

---------------------- Page: 6 ----------------------
IEC 60938-2:2021 © IEC 2021 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
FIXED INDUCTORS FOR ELECTROMAGNETIC
INTERFERENCE SUPPRESSION –
Part 2: Sectional specification on power line chokes
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,

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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

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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

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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

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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.

IEC 60938-2 has been prepared by IEC technical committee 40: Capacitors and resistors for

electronic equipment. It is an International Standard.

This third edition cancels and replaces the second edition published in 1999 and its

Amendment 1:2006. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) the test plan for performance testing has been removed; mandatory safety tests and optional

performance tests are listed in one test plan in Annex B;
b) requirements for Thyristor-Chokes have been withdrawn;
c) material requirements are harmonized with IEC 60939-3 and UL 60939-3;
d) AC chokes up to 1 000 V and DC chokes up to 1 500 V are now in the Scope.
---------------------- Page: 7 ----------------------
– 6 – IEC 60938-2:2021 © IEC 2021
The text of this International Standard is based on the following documents:
FDIS Report on voting
40/2846/FDIS 40/2862/RVD

Full information on the voting for its approval can be found in the report on voting indicated in

the above table.
The language used for the development of this International Standard is English.

This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in

accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are

described in detail at www.iec.ch/standardsdev/publications.

A list of all parts in the IEC 60938 series, published under the general title Fixed inductors for

electromagnetic interference suppression, 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.
---------------------- Page: 8 ----------------------
IEC 60938-2:2021 © IEC 2021 – 7 –
FIXED INDUCTORS FOR ELECTROMAGNETIC
INTERFERENCE SUPPRESSION –
Part 2: Sectional specification on power line chokes
1 Scope

This part of IEC 60938 applies to fixed inductors designed for electromagnetic interference

suppression, which will be connected to an AC mains or other supply with a nominal voltage

not exceeding 1 000 V AC RMS or 1 500 V DC with a nominal frequency not exceeding 400 Hz.

This sectional specification is restricted to fixed inductors for which safety tests are appropriate.

This implies that inductors specified according to this specification will either be connected to

mains supplies, when compliance with the mandatory tests of Annex A is necessary, or used in

other circuit positions where the equipment specification prescribes that some or all of these

safety tests are required.

The object of this document is to prescribe standard requirements for safety tests, preferred

ratings and characteristics, to select from IEC 60938-1 the appropriate methods of test and to

give general performance requirements for suppression inductors.
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 applies, including any

amendments.
IEC 60027 (all parts), Letter symbols to be used in electrical technology
IEC 60050 (all parts), International Electrotechnical Vocabulary (IEV)

IEC 60060-1, High-voltage test techniques – Part 1: General definitions and test requirements

IEC 60068-1, Environmental testing – Part 1: General and guidance

IEC 60068-2-13, Environmental testing – Part 2-13: Tests – Test M: Low air pressure

IEC 60068-2-14, Environmental testing – Part 2-14: Tests – Test N: Change of temperature

IEC 60068-2-17, Basic environmental testing procedures – Part 2-17: Tests – Test Q: Sealing

IEC 60068-2-21, Environmental testing – Part 2-21: Tests – Test U: Robustness of terminations

and integral mounting devices

IEC 60068-2-45, Basic environmental testing procedures – Part 2-45: Tests – Test XA and

guidance: Immersion in cleaning solvents

IEC 60317-0-7, Specifications for particular types of winding wires – Part 0-7: General

requirements – Fully insulated (FIW) zero-defect enamelled round copper wire
---------------------- Page: 9 ----------------------
– 8 – IEC 60938-2:2021 © IEC 2021

IEC 60317-56, Specifications for particular types of winding wires – Part 56: Solderable fully

insulated (FIW) zero-defect polyurethane enamelled round copper wire, class 180

IEC 60335-1, Household and similar electrical appliances – Safety – Part 1: General

requirements

IEC 60617, Graphical symbols for diagrams (available at http://std.iec.ch/iec60617)

IEC 60664-1, Insulation coordination for equipment within low-voltage supply systems – Part 1:

Principles, requirements and tests

IEC 60695-2-11, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –

Glow-wire flammability test method for end-products (GWEPT)

IEC 60695-2-12, Fire hazard testing – Part 2-12: Glowing/hot-wire based test methods –

Glow-wire flammability index (GWFI) test method for materials

IEC 60695-2-13, Fire hazard testing – Part 2-13: Glowing/hot-wire based test methods –

Glow-wire ignition temperature (GWIT) test method for materials

IEC 60695-10-2, Fire hazard testing – Part 10-2: Abnormal heat – Ball pressure test method

IEC 60695-11-10, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and vertical

flame test methods

IEC 60695-11-20, Fire hazard testing – Part 11-20: Test flames – 500 W flame test method

IEC 60851-5, Winding wires – Test methods – Part 5: Electrical properties

IEC 60938-1:2021, Fixed inductors for electromagnetic interference suppression – Part 1:

Generic specification

IEC 60938-2-2, Fixed inductors for electromagnetic interference suppression – Part 2-2: Blank

detail specification – Inductors for which safety tests are required (only)

CISPR 17, Methods of measurement of the suppression characteristics of passive EMC filtering

devices
ISO 80000-6, Quantities and units – Part 6: Electromagnetism
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60938-1 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
---------------------- Page: 10 ----------------------
IEC 60938-2:2021 © IEC 2021 – 9 –
4 General requirements
4.1 General

Units, graphical symbols, letter symbols and terminology shall be taken from the following

publications whenever possible:
– IEC 60027 (all parts),
– IEC 60050 (all parts),
– IEC 60617,
– ISO 80000-6.

When further items are required, they shall be derived in accordance with the principles of the

documents listed above.
4.2 Preferred values of ratings and characteristics
4.2.1 Climatic categories

Electromagnetic interference suppression inductors covered by this specification are classified

into climatic categories according to the general rules given in IEC 60068-1. The lower and

upper category temperatures and the duration of the damp heat, steady state test shall be

selected from the following:
Lower category temperature: −65 °C, −55 °C, −40 °C, −25 °C and −10 °C.
Upper category temperature
...

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