IEC 60301:2012

Preferred diameters of wire terminations of capacitors and resistors

IEC 60301:2012 gives a series of preferred diameters of the finished wire terminations of capacitors and resistors for use in electronic equipment. This third edition cancels and replaces the second edition, published in 1971, and its Amendment 1, published in 1972, and constitutes a technical revision. The main technical changes with respect to the second edition are the following:
- employment of SI units only in the normative part of this standard, causing transfer of all imperial dimensions from Table 1 to the informative Annex A,
- addition of two smaller diameters of wire terminations in Table 1, and
- tightening of the tolerance ranges defined by minimum and maximum diameters in Table 1.

Valeurs préférentielles des diamètres des fils de sorties des condensateurs et résistances

La CEI 60301:2012 donne une série de valeurs préférentielles pour les diamètres des fils de sorties finis des condensateurs et résistances destinés à être utilisés dans les équipements électroniques. Cette troisième édition annule et remplace la deuxième édition parue en 1971, ainsi que son Amendement 1, paru en 1972, et constitue une révision technique. Les modifications techniques principales par rapport à la deuxième édition sont les suivantes:
- utilisation d'unités SI uniquement dans la partie normative de la présente norme, entraînant un déplacement de toutes les dimensions impériales du Tableau 1 à l'Annexe A, informative,
- ajout de deux diamètres plus petits de fils de sorties dans le Tableau 1, et
- abaissement des plages de tolérances définies par les diamètres minimal et maximal du Tableau 1.

General Information

• Status: Published
• Publication Date: 12-Jul-2012
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 31.040.01 - Resistors in general
• ICS: 31.060.01 - Capacitors in general
• Technical Committee: TC 40 - Capacitors and resistors for electronic equipment
• Current Stage: PPUB - Publication issued
• Start Date: 15-Aug-2012
• Completion Date: 13-Jul-2012

Standards Content (Sample)

IEC 60301 ®
Edition 3.0 2012-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Preferred diameters of wire terminations of capacitors and resistors

Valeurs préférentielles des diamètres des fils de sorties des condensateurs et
résistances
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les
microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: [e-mail].

A propos de la CEI
La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.

Liens utiles:
Recherche de publications CEI - www.iec.ch/searchpub Electropedia - www.electropedia.org
La recherche avancée vous permet de trouver des Le premier dictionnaire en ligne au monde de termes
publications CEI en utilisant différents critères (numéro de électroniques et électriques. Il contient plus de 30 000
référence, texte, comité d’études,…). termes et définitions en anglais et en français, ainsi que
Elle donne aussi des informations sur les projets et les les termes équivalents dans les langues additionnelles.
publications remplacées ou retirées. Egalement appelé Vocabulaire Electrotechnique
International (VEI) en ligne.
Just Published CEI - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications de la CEI.
Just Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur
Disponible en ligne et aussi une fois par mois par email. cette publication ou si vous avez des questions
contactez-nous: [e-mail].
IEC 60301 ®
Edition 3.0 2012-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Preferred diameters of wire terminations of capacitors and resistors

Valeurs préférentielles des diamètres des fils de sorties des condensateurs et

résistances
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX F
ICS 31.040; 31.060 ISBN 978-2-83220-225-8

– 2 – 60301 © IEC:2012
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Preferred diameters of wire terminations . 5
Annex A (informative) Imperial wire dimensions . 6

Table 1 – Preferred diameters of wire terminations . 5
Table A.1 – Typical imperial wire diameters . 6

60301 © IEC:2012 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PREFERRED DIAMETERS OF WIRE TERMINATIONS
OF CAPACITORS AND RESISTORS
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 60301 has been prepared by IEC technical committee 40:
Capacitors and resistors for electronic equipment.
This third edition cancels and replaces the second edition, published in 1971, and its
Amendment A.1, published in 1972, and constitutes a technical revision.
The main technical changes with respect to the second edition are the following:
– employment of SI units only in the normative part of this standard, causing transfer of all
imperial dimensions from Table 1 to the informative Annex A,
– addition of two smaller diameters of wire terminations in Table 1, and
– tightening of the tolerance ranges defined by minimum and maximum diameters in
Table 1.
– 4 – 60301 © IEC:2012
The text of this standard is based on the following documents:
FDIS Report on voting
40/2153/FDIS 40/2165/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
60301 © IEC:2012 – 5 –
PREFERRED DIAMETERS OF WIRE TERMINATIONS
OF CAPACITORS AND RESISTORS
1 Scope
This International Standard gives a series of preferred diameters of the finished wire
terminations of capacitors and resistors for use in electronic equipment.
2 Preferred diameters of wire terminations
A series of preferred diameters d of the finished wire terminations is given in Table 1.
Table 1 – Preferred diameters of wire terminations
Minimum Nominal diameter Maximum
diameter d d diameter d
min max
mm mm mm
0,18 0,2 0,22
0,23 0,25 0,27
0,27 0,3 0,33
0,36 0,4 0,43
0,45 0,5 0,53
0,55 0,6 0,63
0,65 0,7 0,73
0,75 0,8 0,83
0,95 1,0 1,03
1,15 1,2 1,23
The nominal or mean diameter of actual wire terminations may deviate from the listed nominal
diameter d, if the actual wire diameter with its tolerance is within the range as defined by the
minimum and maximum diameters, d and d , in Table 1.
min max
NOTE 1 The presented nominal diameters d are intended to apply to the wire terminations of finished products.
The diameter of the supplied lead wire material may deviate from this recommendation since all processing applied
to the wire material takes effect prior to assessment of the wire termination’s diameter.
NOTE 2 The designer of components with wire terminations and the writer of specifications on such products may
wish to consider the influence of a wide variation of the diameter of wire terminations on the performance of the
respective products, e.g. through the thermal conductivity leading to differences in the thermal management of the
component, which probably influences the result of endurance tests and also the functional lifetime of the
respective component. Hence, the designer or writer may decide to prescribe a tighter tolerance window for the
wire terminations of the respective product, preferably within the ranges given in this standard.

– 6 – 60301 © IEC:2012
Annex A
(informative)
Imperial wire dimensions
The previous editions of this standard also listed comparable typical wire dimensions as
established in the imperial unit system. These dimensions are listed in Table A.1.
Table A.1 – Typical imperial wire diameters
Imperial nominal wire Converted metric
diameter diameter
in mm
0,008 0,203
0,010 0,254
0,012 0,305
0,016 0,406
0,020 0,508
0,025 0,635
0,028 0,711
0,032 0,813
0,038 0,965
0,043 1,092
_____________
– 8 – 60301 © CEI:2012
SOMMAIRE
AVANT-PROPOS . 9
1 Domaine d’application . 11
2 Diamètres préférentiels des fils de sorties . 11
Annexe A (informative) Dimensions impériales des fils . 12

Tableau 1 – Diamètres préférentiels des fils de sorties . 11
Tableau A.1 – Diamètres de fils impériaux types . 12

60301 © CEI:2012 – 9 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
VALEURS PRÉFÉRENTIELLES DES DIAMÈTRES DES FILS
DE SORTIES DES CONDENSATEURS ET RÉSISTANCES

AVANT-PROPOS
1) La Commission Electrotechnique Internationale (CEI) est une organisation mo
...