IEC 63522-4:2025

Electrical relays - Tests and measurements - Part 4: Dielectric strength test

IEC 63522-4:2025 is used for testing along with the appropriate severities and conditions for measurements and tests designed to assess the ability of DUTs to perform under expected conditions of transportation, storage and all aspects of operational use.
The object of this test is to define a standard test method for the dielectric strength test.

Relais électriques - Essais et mesurages - Partie 4: Essai de rigidité diélectrique

IEC 63522-4:2025 traite des essais ainsi que des sévérités et conditions appropriées pour les mesurages et essais destinés à évaluer l'aptitude de DUT à fonctionner dans des conditions prévues de transport, de stockage, et de tous les aspects d'utilisation opérationnelle.
L'objet de cet essai est de définir une méthode d'essai normalisée pour l'essai de rigidité diélectrique.

General Information

• Status: Published
• Publication Date: 15-Dec-2025
• ICS: 29.120.70 - Relays
• Technical Committee: TC 94 - Electrical relays
• Drafting Committee: WG 3 - TC 94/WG 3
• Current Stage: PPUB - Publication issued
• Start Date: 16-Dec-2025
• Completion Date: 03-Oct-2025

Standards Content (Sample)

IEC 63522-4 ®
Edition 1.0 2025-12
INTERNATIONAL
STANDARD
Electrical relays - Tests and measurements -
Part 4: Dielectric strength test
ICS 29.120.70  ISBN 978-2-8327-0897-2

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.

IEC Secretariat Tel.: [phone]
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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.

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The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
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CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Test procedures . 5
4.1 Purpose . 5
4.2 Procedure . 5
4.2.1 Pre-conditioning . 5
4.2.2 Dielectric strength test . 6
4.3 Conditions to be specified . 6
5 Evaluation . 6
5.1 General . 6
5.2 Test report . 7
Annex A (normative) Test with alternating voltages . 8
A.1 General . 8
A.2 Requirement for the test voltage . 8
A.2.1 Voltage waveshape . 8
A.2.2 Tolerance . 8
A.3 Generation of the test voltage . 8
A.3.1 General . 8
A.3.2 Requirements for the test circuit – alternative A . 8
A.3.3 Requirements for the test circuit – alternative B . 9
Bibliography . 10

Table A.1 – Minimum test current . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Electrical relays - Tests and measurements -
Part 4: Dielectric strength test

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.
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63522-4 has been prepared by IEC technical committee 94: Electrical relays. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
94/1056/FDIS 94/1168/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 greater detail at www.iec.ch/publications.
A list of all parts of IEC 63522 series, published under the general title Electrical relays - Tests
and measure
...

IEC 63522-4 ®
Edition 1.0 2025-12
NORME
INTERNATIONALE
Relais électriques - Essais et mesurages -
Partie 4: Essai de rigidité diélectrique
ICS 29.120.70  ISBN 978-2-8327-0897-2

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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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.

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SOMMAIRE
AVANT-PROPOS . 2
1 Domaine d'application . 4
2 Références normatives . 4
3 Termes et définitions . 4
4 Procédures d'essai . 5
4.1 Objet . 5
4.2 Procédure . 5
4.2.1 Préconditionnement . 5
4.2.2 Essai de rigidité diélectrique . 6
4.3 Conditions à spécifier . 6
5 Évaluation . 7
5.1 Généralités . 7
5.2 Rapport d'essai . 7
Annexe A (normative) Essai avec des tensions alternatives . 8
A.1 Généralités . 8
A.2 Exigences relatives à la tension d'essai . 8
A.2.1 Forme d'onde de la tension. 8
A.2.2 Tolérance . 8
A.3 Production de la tension d'essai . 8
A.3.1 Généralités . 8
A.3.2 Exigences relatives au circuit d'essai – variante A . 8
A.3.3 Exigences relatives au circuit d'essai – variante B . 9
Bibliographie . 10

Tableau A.1 – Courant d'essai minimal . 8

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Relais électriques - Essais et mesurages -
Partie 4: Essai de rigidité diélectrique

AVANT-PROPOS
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de l'ensemble des comités électrotechniques nationaux (Comités nationaux de l'IEC). L'IEC a pour objet de
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L'IEC 63522-4 a été établie par le comité d'études 94 de l'IEC: Relais électriques. Il s'agit d'une
Norme internationale.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
94/1056/FDIS 94/1168/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cette Norme internationale est l'anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l'IEC sont décrits plus en détail sous www.iec.ch/publications.
Une liste de toutes les parties de la série IEC 63522, publiées sous le titre général Relais
électriques - Essais et mesurages, se trouve sur le site web de l'IEC.
La présente Norme internationale doit être lue conjointement avec l'IEC 63522-0:– .
Le comité a décidé que le contenu de ce document ne sera pas modifié avant la date de stabilité
indiquée sur le site web de l'IEC sous webstore.iec.ch dans les données relatives a
...

IEC 63522-4 ®
Edition 1.0 2025-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical relays - Tests and measurements -
Part 4: Dielectric strength test

Relais électriques - Essais et mesurages -
Partie 4: Essai de rigidité diélectrique
ICS 29.120.70  ISBN 978-2-8327-0897-2

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 Secretariat Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.

IEC publications search - IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the
The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary.
variety of criteria (reference number, text, technical With a subscription you will always have access to up to date
committee, …). It also gives information on projects, content tailored to your needs.

replaced and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English
details all new publications released. Available online and and French, with equivalent terms in 25 additional languages.
once a month by email. Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or
need further assistance, please contact the Customer
Service Centre: [e-mail].
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.

Recherche de publications IEC -  IEC Products & Services Portal - products.iec.ch
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications gratuitement tous les aperçus des publications, symboles
IEC en utilisant différents critères (numéro de référence, graphiques et le glossaire. Avec un abonnement, vous aurez
texte, comité d’études, …). Elle donne aussi des toujours accès à un contenu à jour adapté à vos besoins.
informations sur les projets et les publications remplacées
ou retirées. Electropedia - www.electropedia.org
Le premier dictionnaire d'électrotechnologie en ligne au
IEC Just Published - webstore.iec.ch/justpublished monde, avec plus de 22 500 articles terminologiques en
Restez informé sur les nouvelles publications IEC. Just anglais et en français, ainsi que les termes équivalents
Published détaille les nouvelles publications parues. dans 25 langues additionnelles. Egalement appelé
Disponible en ligne et une fois par mois par email. Vocabulaire Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-
nous: [e-mail].
CONTENTS
FOREWORD . 2
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Test procedures . 5
4.1 Purpose . 5
4.2 Procedure . 5
4.2.1 Pre-conditioning . 5
4.2.2 Dielectric strength test . 6
4.3 Conditions to be specified . 6
5 Evaluation . 6
5.1 General . 6
5.2 Test report . 7
Annex A (normative) Test with alternating voltages . 8
A.1 General . 8
A.2 Requirement for the test voltage . 8
A.2.1 Voltage waveshape . 8
A.2.2 Tolerance . 8
A.3 Generation of the test voltage . 8
A.3.1 General . 8
A.3.2 Requirements for the test circuit – alternative A . 8
A.3.3 Requirements for the test circuit – alternative B . 9
Bibliography . 10

Table A.1 – Minimum test current . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Electrical relays - Tests and measurements -
Part 4: Dielectric strength test

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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 63522-4 has been prepared by IEC technical committee 94: Electrical relays. It is an
International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
94/1056/FDIS 94/1168/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 greater detail at www.iec.ch/publications.
A list of all parts of IEC 63522 series, published under the general title Electrical relays - Tests
and measurements, can be found on the IEC website.
This International Standard is to be used in conjunction with IEC 63522-0:– .
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2024.
1 Scope
This part of IEC 63522 is used for testing along with the appropriate severities and conditions
for measurements and tests designed to assess the ability of DUTs to perform under expected
conditions of transportation, storage and all aspects of operational use.
The object of this test is to define a standard test method for the dielectric strength test.
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 60068-2-2, Environmental testing - Part 2-2: Tests - Test B: Dry heat
IEC 60068-2-67, Environmental testing - Part 2-67: Tests - Test Cy: Damp heat, steady state,
accelerated test primarily intended for components
IEC 61180, High-voltage test techniques for low-voltage equipment - Definitions, test and
procedure requirements, test equipment
IEC 63522-0:– , Electrical relays - Tests and measurements - Part 7-0: General and guidance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 63522-0 and the
following apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
– IEC Electropedia: available at https://www.electropedia.org/
– ISO Online browsing platform: available at https://www.iso.org/obp
3.1
breakdown voltage
voltage at which electric breakdown occurs under specified test conditions, or in use
[SOURCE: IEC 60050-212:2010, 212-11-34, modified ─ "prescribed" replaced with "specified".]
___________
Under preparation. Stage at the time of publication: IEC CDV 63522-0:2025.
3.2
breakdown time
time until the breakdown occurs, measured from starting time of applying the test voltage
Note 1 to entry: For more than one sample, it is recommended to handle each sample separately.
3.3
electric breakdown
failure of insulation under electric stress when the discharge completely bridges the insulation,
thus reducing the voltage between the electrodes almost to zero
3.4
sparkover
electric breakdown in a gaseous or liquid medium
3.5
flashover
electric breakdown between conductors in a gas or a liquid or in vacuum, at least partly along
the surface or solid insulation
[SOURCE: IEC 60050-212:2010, 212-11-47]
3.6
puncture
electric breakdown through solid insulation
4 Test procedures
4.1 Purpose
To ensure that the withstand capability of the insulation between specific circuits of the relay or
across open contact(s) is sufficient.
4.2 Procedure
4.2.1 Pre-conditioning
If applicable, a relay in the new condition shall be subjected to the following preconditioning,
unless other procedures and values are specified:
The preconditioning comprises the tests "dry heat" according to IEC 60068-2-2 and "damp heat"
according to IEC 60068-2-67.
The test dry heat is carried out in a heat chamber. The air temperature is maintained at 55 °C
with an accuracy of ±2 K in the area where the DUTs are mounted. The DUTs are kept in the
chamber for 48 h.
The test damp heat is carried out in a climatic test cabinet at a relative humidity between 91 %
and 95 %. The air temperature shall be maintained at 25 °C with an accuracy of ±5 K in the
area where the DUTs are mounted. The DUTs are kept in the chamber for 48 h. There shall be
no condensation.
4.2.2 Dielectric strength test
The dielectric strength shall be started immediately after the preconditioning and finished
without unnecessary delay. The test voltage specified for a circuit shall be applied to the
respective relay terminals. The AC test voltage shall be of sinusoidal waveform having a
frequency of 50 Hz or 60 Hz and may be substituted by a DC test voltage of a value equal to
the peak value of the AC test voltage. Unless otherwise specified, the test voltage is applied
for 1 min across the insulation or disconnection.
An application time of 1 s is permissible, provided the test voltage value is increased to 110 %
of the rated value. For even shorter periods, the manufacturer shall evaluate an appropriate
value ensuring the same level of dielectric withstand capability. No flashover or breakdown shall
occur. A current of not more than 3 mA is permitted.
Special components which might render the test impractical such as light emitting diodes, free-
wheeling diodes, varistors, are disconnected at one pole, or bridged, or removed, as appropriate
to the insulation being tested.
Dielectric strength test equipment and voltage shall be in line with Annex A.
The test procedure shall be carried out at reference ambient conditions according to
IEC 63522-0:–, Table 2.
4.3 Conditions to be specified
The conditions to be specified are the following:
a) terminals to which the test voltage shall be applied, selected from the following:
• terminals of each contact circuit; break contacts shall be opened for this test,
• all terminals requiring the same test voltage connected and any exposed conductive part
not intended to be electrically connected, the latter being simulated by a foil wrapped
around relays having an insulating enclosure,
• terminals of separate windings (bifilar or not),
• all coil terminals requiring the same test voltage connected and all contact circuit
terminals connected together,
• terminals of separate contact circuits;
b) test voltage or voltages;
c) duration of the test: 1 s or 1 min;
d) reductions for repetition tests, for example for final measurement after an endurance test.
Reductions shall be specified together with such tests;
e) details of the preconditioning, if required;
5 Evaluation
5.1 General
No electric breakdown (sparkover, flashover or puncture) shall occur.
The test report shall state the conditions and the values which confirm or do not confirm the
requirements.
5.2 Test report
If this document is executed as a part of a test record of another standard, then the results shall
be reported as required in the other standard.
Otherwise, it is recommended to issue a dedicated test report according to this document.
The test report shall contain all the information necessary to reproduce the test. In particular,
the following shall be recorded:
• description of DUT;
• where the test voltage was applied with:
– test voltage,
– test duration;
• in case of any breakdown:
– breakdown voltage,
– breakdown time,
– kind of electrical breakdown (sparkover, flashover or puncture);
• if applicable, any other observation;
• the time to complete the test shall be indicated in the test report.

Annex A
(normative)
Test with alternating voltages
A.1 General
The dielectric strength test equipment shall comply with IEC 61180.
A.2 Requirement for the test voltage
A.2.1 Voltage waveshape
The alternating test voltage, as applied to the test object, should generally have a frequency
comprised in the range 45 Hz to 65 Hz, normally referred to as power-frequency test voltage.
Special tests can be applicable at frequencies considerably below or above this range, as
specified by TC 42.
The voltage waveshape shall be substantially sinusoidal. The ratio between the peak value and
the RMS value is √2 ± 3 %. The total harmonic distortion (THD) of the test voltage shall be less
than 5 % under full load conditions.
The test voltage is the RMS value.
NOTE In the area of low-voltage equipment, the RMS value is used to specify the test voltage, although the
important factor for breakdown is the peak value.
A.2.2 Tolerance
If not otherwise specified by TC 42 or application standards, a tolerance of ±3 % is acceptable
between the specified and the measurement test volage value throughout the test.
A.3 Generation of the test voltage
A.3.1 General
One of the alternatives described in A.3.2
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