IEC 60238:2016
(Main)Edison screw lampholders
Edison screw lampholders
IEC 60238:2016 applies to lampholders with Edison thread E14, E27 and E40, designed for connection to the supply of lamps and semi-luminaires only. It also applies to switched-lampholders for use in AC circuits only, where the working voltage does not exceed 250 V r.m.s. This ninth edition cancels and replaces the eighth edition published in 2004, Amendment 1: 2008 and Amendment 2:2011. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Addition of a pull test for certain E5 and E10 lampholders.
b) Annex D listing amended requirements/clauses which require products to be retested.
Douilles à vis Edison pour lampes
L'IEC 60238:2016 s'applique aux douilles à vis Edison E14, E27 et E40 destinées uniquement au raccordement des lampes et des semi-luminaires à l'alimentation. Elle s'applique aussi aux douilles à interrupteur destinées exclusivement aux circuits de courant alternatif dont la tension de travail ne dépasse pas 250 V (valeur efficace). Cette neuvième édition annule et remplace la huitième édition parue en 2004, l'Amendement 1: 2008 et l'Amendement 2:2011. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) Addition d'un essai de traction pour certaines douilles E5 et E10.
b) Une Annexe D répertoriant les exigences/articles amendés nécessitant la réalisation de nouveaux essais sur les produits.
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IEC 60238 ®
Edition 9.0 2016-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Edison screw lampholders
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
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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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 60238 ®
Edition 9.0 2016-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Edison screw lampholders
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.140.10 ISBN 978-2-8322-3538-6
– 2 – IEC 60238:2016 RLV © IEC 2016
CONTENTS
FOREWORD .4
1 General .
1 Scope .6
2 Normative references .7
3 Terms and definitions .8
4 General requirement . 12
5 General conditions for tests . 12
6 Standard ratings . 14
7 Classification . 15
8 Marking . 16
9 Dimensions . 18
14 Switched lampholders . 33
12 Provision for earthing . 27
13 Construction . 28
10 Protection against electric shock. 21
11 Terminals . 23
15 Moisture resistance, insulation resistance and electric strength . 34
16 Mechanical strength . 36
17 Screws, current-carrying parts and connections . 41
18 Creepage distances and clearances . 42
19 Normal operation . 46
20 General resistance to heat . 47
21 Resistance to heat, fire and tracking . 49
22 Resistance to excessive residual stresses (season cracking) and to rusting . 52
Annex A (normative) Season cracking/corrosion test . 73
Annex B (informative) Guidance for requirements in IEC 61058-1 applicable to
switches in lampholders (see 14.2) . 75
Annex C (informative) Guidance for special requirements in appliance standards –
Household and similar electrical appliances . 77
Annex D (informative) Schedule of amended subclauses containing more
serious/critical requirements which require products to be retested . 79
Bibliography . 80
Figure 1a –Nipple thread for lampholders: metric thread. Basic profile and design
profile for the nut and for the screw . 53
Figure 1b –Nipple thread for lampholders: ISO standard pipe thread. Basic profile and
design profile for the nut and for the screw . 54
Figure 2a – Gauges for metric ISO thread for nipples . 55
Figure 2b – Gauges for ISO standard pipe thread for nipples . 56
Figure 3 – Gauge for holes for backplate lampholder screws . 57
Figure 4 – Normal operation test apparatus . 58
Figure 5 – Test caps for the test of Clause 18 . 59
Figure 6 – Torque apparatus . 60
Figure 7 – Tumbling barrel . 61
Figure 8 – Impact-test apparatus . 62
Figure 9 – Pressure apparatus . 63
Figure 10 – Ball-pressure test apparatus . 63
Figure 11 – Test cap for the tests of 15.4 and 20.3 . 64
Figure 12 – Bending apparatus . 65
Figure 13 – Test cap A and test cap B for lampholders E14 (2 of 2) . 67
Figure 14 – Test cap for lampholders E27 . 68
Figure 15 – Test cap for lampholders E40 . 69
Figure 16 – Standard test finger (according to IEC 60529) . 70
Figure 17 – Clarification of some definitions . 71
Figure 18 – Preparation of specimens for the needle-flame test of 21.4 . 72
Table 1 – Thickness of screw shells and contacts . 19
Table 2 – Minimum effective screw lengths . 20
Table 3 – Dimensions of threaded entries and set screws . 21
Table 4 – Minimum dimensions of pillar-type terminals . 25
Table 5 – Minimum dimensions of screw-type terminals . 25
Table 6 – Pull and torque values . 31
Table 7 – Insertion torque . 33
Table 8 – Minimum and maximum removal torques . 33
Table 9 – Test cap dimensions . 37
Table 10 – Heights of fall . 38
Table 11 – Maximum deformation values . 40
Table 12 – Torque values . 41
Table 13a – Minimum distances for AC (50/60 Hz) sinusoidal voltages: Impulse
withstand category II . 44
Table 13b – Minimum distances for AC (50/60 Hz) sinusoidal voltages: Impulse
withstand category III . 45
Table 14 – Minimum distances for non-sinusoidal pulse voltages. 45
Table 15 – Heating cabinet temperatures . 48
Table A.1 – pH adjustment . 73
– 4 – IEC 60238:2016 RLV © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EDISON SCREW LAMPHOLDERS
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,
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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, serva
...
IEC 60238 ®
Edition 9.0 2016-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Edison screw lampholders
Douilles à vis edison pour lampes
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
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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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 15 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
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plus récente, un corrigendum ou amendement peut avoir été publié.
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bibliographiques sur les Normes internationales,
électriques. Il contient 20 000 termes et définitions en anglais
Spécifications techniques, Rapports techniques et autres
et en français, ainsi que les termes équivalents dans 15
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
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La recherche avancée permet de trouver des publications IEC 65 000 entrées terminologiques électrotechniques, en anglais
en utilisant différents critères (numéro de référence, texte, et en français, extraites des articles Termes et Définitions des
comité d’études,…). Elle donne aussi des informations sur les publications IEC parues depuis 2002. Plus certaines entrées
projets et les publications remplacées ou retirées. antérieures extraites des publications des CE 37, 77, 86 et
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IEC 60238 ®
Edition 9.0 2016-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Edison screw lampholders
Douilles à vis edison pour lampes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.10 ISBN 978-2-8322-3465-5
– 2 – IEC 60238:2016 © IEC 2016
CONTENTS
FOREWORD .4
1 Scope .6
2 Normative references .7
3 Terms and definitions .8
4 General requirement . 11
5 General conditions for tests . 11
6 Standard ratings . 12
7 Classification . 13
8 Marking . 14
9 Dimensions . 17
10 Protection against electric shock. 19
11 Terminals . 22
12 Provision for earthing . 25
13 Construction . 26
14 Switched lampholders . 31
15 Moisture resistance, insulation resistance and electric strength . 32
16 Mechanical strength . 35
17 Screws, current-carrying parts and connections . 39
18 Creepage distances and clearances . 41
19 Normal operation . 44
20 General resistance to heat . 45
21 Resistance to heat, fire and tracking . 47
22 Resistance to excessive residual stresses (season cracking) and to rusting . 50
Annex A (normative) Season cracking/corrosion test . 71
Annex B (informative) Guidance for requirements in IEC 61058-1 applicable to
switches in lampholders (see 14.2) . 73
Annex C (informative) Guidance for special requirements in appliance standards –
Household and similar electrical appliances . 75
Annex D (informative) Schedule of amended subclauses containing more
serious/critical requirements which require products to be retested . 77
Bibliography . 78
Figure 1a –Nipple thread for lampholders: metric thread. Basic profile and design
profile for the nut and for the screw . 51
Figure 1b –Nipple thread for lampholders: ISO standard pipe thread. Basic profile and
design profile for the nut and for the screw . 52
Figure 2a – Gauges for metric thread for nipples . 53
Figure 2b – Gauges for ISO standard pipe thread for nipples . 54
Figure 3 – Gauge for holes for backplate lampholder screws . 55
Figure 4 – Normal operation test apparatus . 56
Figure 5 – Test caps for the test of Clause 18 . 57
Figure 6 – Torque apparatus . 58
Figure 7 – Tumbling barrel . 59
Figure 8 – Impact-test apparatus . 60
Figure 9 – Pressure apparatus . 61
Figure 10 – Ball-pressure test apparatus . 61
Figure 11 – Test cap for the tests of 15.4 and 20.3 . 62
Figure 12 – Bending apparatus . 63
Figure 13 – Test cap A and test cap B for lampholders E14 . 65
Figure 14 – Test cap for lampholders E27 . 66
Figure 15 – Test cap for lampholders E40 . 67
Figure 16 – Standard test finger (according to IEC 60529) . 68
Figure 17 – Clarification of some definitions . 69
Figure 18 – Preparation of specimens for the needle-flame test of 21.4 . 70
Table 1 – Thickness of screw shells and contacts . 18
Table 2 – Minimum effective screw lengths . 18
Table 3 – Dimensions of threaded entries and set screws . 19
Table 4 – Minimum dimensions of pillar-type terminals . 23
Table 5 – Minimum dimensions of screw-type terminals . 24
Table 6 – Pull and torque values . 29
Table 7 – Insertion torque . 31
Table 8 – Minimum and maximum removal torques . 31
Table 9 – Test cap dimensions . 35
Table 10 – Heights of fall . 37
Table 11 – Maximum deformation values . 38
Table 12 – Torque values . 40
Table 13a – Minimum distances for AC (50/60 Hz) sinusoidal voltages: Impulse
withstand category II . 42
Table 13b – Minimum distances for AC (50/60 Hz) sinusoidal voltages: Impulse
withstand category III . 43
Table 14 – Minimum distances for non-sinusoidal pulse voltages. 43
Table 15 – Heating cabinet temperatures .
...
IEC 60238 ®
Edition 9.1 2017-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Edison screw lampholders
Douilles à vis edison pour lampes
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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
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.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) 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 IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
Catalogue IEC - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
Application autonome pour consulter tous les renseignements
Le premier dictionnaire en ligne de termes électroniques et
bibliographiques sur les Normes internationales,
électriques. Il contient 20 000 termes et définitions en anglais
Spécifications techniques, Rapports techniques et autres
et en français, ainsi que les termes équivalents dans 16
documents de l'IEC. Disponible pour PC, Mac OS, tablettes
langues additionnelles. Egalement appelé Vocabulaire
Android et iPad.
Electrotechnique International (IEV) en ligne.
Recherche de publications IEC - www.iec.ch/searchpub
Glossaire IEC - std.iec.ch/glossary
La recherche avancée permet de trouver des publications IEC
65 000 entrées terminologiques électrotechniques, en anglais
en utilisant différents critères (numéro de référence, texte,
et en français, extraites des articles Termes et Définitions des
comité d’études,…). Elle donne aussi des informations sur les
publications IEC parues depuis 2002. Plus certaines entrées
projets et les publications remplacées ou retirées.
antérieures extraites des publications des CE 37, 77, 86 et
CISPR de l'IEC.
IEC Just Published - webstore.iec.ch/justpublished
Restez informé sur les nouvelles publications IEC. Just Service Clients - webstore.iec.ch/csc
Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur cette
Disponible en ligne et aussi une fois par mois par email. publication ou si vous avez des questions contactez-nous:
csc@iec.ch.
IEC 60238 ®
Edition 9.1 2017-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Edison screw lampholders
Douilles à vis edison pour lampes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.10 ISBN 978-2-8322-3918-6
IEC 60238 ®
Edition 9.1 2017-01
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Edison screw lampholders
Douilles à vis edison pour lampes
– 2 – IEC 60238:2016+AMD1:2017 CSV
© IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 7
3 Terms and definitions. 8
4 General requirement . 13
5 General conditions for tests . 13
6 Standard ratings . 14
7 Classification . 15
8 Marking . 16
9 Dimensions . 18
10 Protection against electric shock . 21
11 Terminals . 23
12 Provision for earthing . 27
13 Construction . 28
14 Switched lampholders . 33
15 Moisture resistance, insulation resistance and electric strength . 34
16 Mechanical strength . 36
17 Screws, current-carrying parts and connections . 41
18 Creepage distances and clearances . 42
19 Normal operation . 49
20 General resistance to heat . 50
21 Resistance to heat, fire and tracking . 53
22 Resistance to excessive residual stresses (season cracking) and to rusting . 55
Annex A (normative) Season cracking/corrosion test . 76
Annex B (informative) Guidance for requirements in IEC 61058-1 applicable to switches
in lampholders (see 14.2) . 78
Annex C (informative) Guidance for special requirements in appliance standards –
Household and similar electrical appliances . 80
Annex D (informative) Schedule of amended subclauses containing more
serious/critical requirements which require products to be retested Clauses containing
new or more stringent requirements with respect to the previous edition . 82
Bibliography . 83
Figure 1a –Nipple thread for lampholders: metric thread. Basic profile and design profile
for the nut and for the screw . 56
Figure 1b –Nipple thread for lampholders: ISO standard pipe thread. Basic profile and
design profile for the nut and for the screw . 57
Figure 2a – Gauges for metric thread for nipples . 58
Figure 2b – Gauges for ISO standard pipe thread for nipples . 59
Figure 3 – Gauge for holes for backplate lampholder screws . 60
Figure 4 – Normal operation test apparatus . 61
Figure 5 – Test caps for the test of Clause 18 . 62
Figure 6 – Torque apparatus . 63
© IEC 2017
Figure 7 – Tumbling barrel . 64
Figure 8 – Impact-test apparatus . 65
Figure 9 – Pressure apparatus . 66
Figure 10 – Ball-pressure test apparatus . 66
Figure 11 – Test cap for the tests of 15.4 and 20.3 . 67
Figure 12 – Bending apparatus . 68
Figure 13 – Test cap A and test cap B for lampholders E14 (2 of 2) . 70
Figure 14 – Test cap for lampholders E27 . 71
Figure 15 – Test cap for lampholders E40 . 72
Figure 16 – Standard test finger (according to IEC 60529) . 73
Figure 17 – Clarification of some definitions . 74
Figure 18 – Preparation of specimens for the needle-flame test of 21.4 . 75
Table 1 – Thickness of screw shells and contacts . 19
Table 2 – Minimum effective screw lengths . 20
Table 3 – Dimensions of threaded entries and set screws . 21
Table 4 – Minimum dimensions of pillar-type terminals . 25
Table 5 – Minimum dimensions of screw-type terminals . 25
Table 6 – Pull and torque values . 31
Table 7 – Insertion torque . 33
Table 8 – Minimum and maximum removal torques . 33
Table 9 – Test cap dimensions . 37
Table 10 – Heights of fall. 38
Table 11 – Maximum deformation values . 40
Table 12 – Torque values .
...
IEC 60238 ®
Edition 9.2 2020-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Edison screw lampholders
Douilles à vis edison pour lampes
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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
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IEC 60238 ®
Edition 9.2 2020-01
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Edison screw lampholders
Douilles à vis edison pour lampes
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.140.10 ISBN 978-2-8322-7771-3
IEC 60238 ®
Edition 9.2 2020-01
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Edison screw lampholders
Douilles à vis edison pour lampes
– 2 – IEC 60238:2016+AMD1:2017
+AMD2:2020 CSV © IEC 2020
CONTENTS
FOREWORD . 4
INTRODUCTION to Amendment 2 . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 9
4 General requirement . 14
5 General conditions for tests . 14
6 Standard ratings . 15
7 Classification . 16
8 Marking . 17
9 Dimensions. 19
10 Protection against electric shock . 22
11 Terminals . 24
12 Provision for earthing . 28
13 Construction . 29
14 Switched lampholders . 34
15 Moisture resistance, insulation resistance and electric strength . 35
16 Mechanical strength . 37
17 Screws, current-carrying parts and connections . 41
18 Creepage distances and clearances . 43
19 Normal operation . 50
20 General resistance to heat . 51
21 Resistance to heat, fire and tracking . 54
22 Resistance to excessive residual stresses (season cracking) and to rusting . 56
Annex A (normative) Season cracking/corrosion test . 77
Annex B (informative) Guidance for requirements in IEC 61058-1 applicable to
switches in lampholders (see 14.2) . 79
Annex C (informative) Guidance for special requirements in appliance standards –
Household and similar electrical appliances . 81
Annex D (informative) Schedule of amended subclauses containing more
serious/critical requirements which require products to be retested Clauses containing
new or more stringent requirements with respect to the previous edition . 83
Bibliography . 84
Figure 1a –Nipple thread for lampholders: metric thread. Basic profile and design
profile for the nut and for the screw . 57
Figure 1b –Nipple thread for lampholders: ISO standard pipe thread. Basic profile and
design profile for the nut and for the screw . 58
Figure 2a – Gauges for metric thread for nipples . 59
Figure 2b – Gauges for ISO standard pipe thread for nipples . 60
Figure 3 – Gauge for holes for backplate lampholder screws . 61
Figure 4 – Normal operation test apparatus . 62
Figure 5 – Test caps for the test of Clause 18 . 63
+AMD2:2020 CSV © IEC 2020
Figure 6 – Torque apparatus . 64
Figure 7 – Tumbling barrel . 65
Figure 8 – Impact-test apparatus . 66
Figure 9 – Pressure apparatus . 67
Figure 10 – Ball-pressure test apparatus. 67
Figure 11 – Test cap for the tests of 15.4 and 20.3 . 68
Figure 12 – Bending apparatus . 69
Figure 13 – Test cap A and test cap B for lampholders E14 (2 of 2) . 71
Figure 14 – Test cap for lampholders E27 . 72
Figure 15 – Test cap for lampholders E40 . 73
Figure 16 – Standard test finger (according to IEC 60529) . 74
Figure 17 – Clarification of some definitions . 75
Figure 18 – Preparation of specimens for the needle-flame test of 21.4 . 76
Table 1 – Thickness of screw shells and contacts . 20
Table 2 – Minimum effective screw lengths . 21
Table 3 – Dimensions of threaded entries and set screws . 22
Table 4 – Minimum dimensions of pillar-type terminals . 26
Table 5 – Minimum dimensions of screw-type terminals . 26
Table 6 – Pull and torque values . 32
Table 7 – Insertion torque . 34
Table 8 – Minimum and maximum removal torques . 34
Table 9 – Test cap dimensions . 38
Table 10 – Heights of fall . 39
Table 11 – Maximum deformation values . 41
Table 12 – Torque values . 42
Table 13a – Minimum distances for AC (50/60 Hz) sinusoidal voltages up to 30 kHz −
Impulse withstand category II . 45
Table 13b – Minimum distances for AC (50/60 Hz) sinusoidal voltages up to 30 kHz −
Impulse withstand category III .
...
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