CLC/TS 62271-304:2008

SLOVENSKI STANDARD
01-januar-2009
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High-voltage switchgear and controlgear - Part 304: Design classes for indoor enclosed
switchgear and controlgear for rated voltages above 1 kV up to and includuing 52 kV to
be used in severe climatic conditions (IEC/TS 62271-304:2008)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 304: Auslegungsklassen für
gekapselte Schaltgerätekombinationen und Hochspannungsschaltanlagen von 1 kV bis
einschließlich 52 kV für den Einsatz unter erschwerten klimatischen Bedingungen V
Appareillage à haute tension - Partie 304: Classes de construction pour l'appareillage
d'intérieur sous enveloppe pour tensions assignées à partir de 1 kV jusqu'à 52 kV inclus
pour usage sous conditions climatiques sévères (CEI/TS 62271-304:2008)
Ta slovenski standard je istoveten z: CLC/TS 62271-304:2008
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CLC/TS 62271-304
SPÉCIFICATION TECHNIQUE
November 2008
TECHNISCHE SPEZIFIKATION
ICS 29.130.10
English version
High-voltage switchgear and controlgear -
Part 304: Design classes for indoor enclosed switchgear and controlgear
for rated voltages above 1 kV up to and including 52 kV
to be used in severe climatic conditions
(IEC/TS 62271-304:2008)
Appareillage à haute tension -  Hochspannungs-Schaltgeräte und -
Partie 304: Classes de construction Schaltanlagen -
pour l'appareillage d'intérieur Teil 304: Auslegungsklassen
sous enveloppe pour tensions assignées für gekapselte Schaltgerätekombinationen
à partir de 1 kV jusqu'à 52 kV inclus und Hochspannungsschaltanlagen
pour usage sous conditions von 1 kV bis einschließlich 52 kV
climatiques sévères für den Einsatz unter erschwerten
(CEI/TS 62271-304:2008) klimatischen Bedingungen
(IEC/TS 62271-304:2008)
This Technical Specification was approved by CENELEC on 2008-10-01.

CENELEC members are required to announce the existence of this TS in the same way as for an EN and to
make the TS available promptly at national level in an appropriate form. It is permissible to keep conflicting
national standards in force.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. CLC/TS 62271-304:2008 E

Foreword
The text of document 17C/402/CDV, future edition 1 of IEC/TS 62271-304, prepared by SC 17C,
High-voltage switchgear and controlgear assemblies, of IEC TC 17, Switchgear and controlgear, was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as CLC/TS 62271-304 on
2008-10-01.
The following date was fixed:
– latest date by which the existence of the CLC/TS
has to be announced at national level (doa) 2009-01-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the Technical Specification IEC/TS 62271-304:2008 was approved by CENELEC as a
Technical Specification without any modification.
__________
-
- 3 - CLC/TS 62271-304:2008
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year

1) 2)
IEC 60060-1 - High-voltage test techniques - HD 588.1 S1 1991
Part 1: General definitions and test
requirements
IEC 60068-1 Series Environmental testing EN 60068 Series

IEC 62271-1 2007 High-voltage switchgear and controlgear - EN 62271-1 2008
Part 1: Common specifications
1) 2)
IEC 62271-200 - High-voltage switchgear and controlgear - EN 62271-200 2004
Part 200: AC metal-enclosed switchgear and
controlgear for rated voltages above 1 kV and
up to and including 52 kV
1) 2)
IEC 62271-201 - High-voltage switchgear and controlgear - EN 62271-201 2006
Part 201: AC insulation-enclosed switchgear + corr. November 2006
and controlgear for rated voltages above 1 kV
and up to and including 52 kV
1)
Undated reference.
2)
Valid edition at date of issue.

IEC/TS 62271-304
Edition 1.0 2008-05
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
High-voltage switchgear and controlgear –
Part 304: Design classes for indoor enclosed switchgear and controlgear for
rated voltages above 1 kV up to and including 52 kV to be used in severe
climatic conditions
Appareillage à haute tension –
Partie 304: Classes de construction pour l'appareillage d’intérieur sous
enveloppe pour tensions assignées à partir de 1 kV jusqu’à 52 kV inclus pour
usage sous conditions climatiques sévères

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
P
CODE PRIX
ICS 29.130.10 ISBN 2-8318-9828-5

– 2 – TS 62271-304 © IEC:2008
CONTENTS
FOREWORD.3
1 Scope and object.5
2 Normative references .5
3 Degrees of severity of service conditions under condensation and pollution .6
4 Classification of enclosed switchgear and controlgear .7
5 Classification procedure .7
6 Test facilities and associated requirements .9
6.1 Climatic test room .9
6.2 Control requirements.9
6.3 Energizing facilities .9
7 Selection and arrangement of the equipment for test .9
7.1 Selection of the equipment .9
7.2 Arrangement of the equipment .9
8 Ageing test .10
8.1 Level 1 ageing test .10
8.2 Level 2 ageing test .11
9 Diagnostic procedure after ageing test .11
9.1 General .11
9.2 Electrical diagnostic procedure.12
9.3 Mechanical diagnostic procedure (optional).13
9.4 Evaluation .13
Annex A (normative) Climatic cycle.14
Annex B (normative) Climatic test room .15
Annex C (informative) Example of typical environment.16

Figure 1 – Flow chart for classification procedure .8
Figure 2 – Level 1 ageing test.11
Figure 3 – Power-frequency withstand voltage test with high humidity after ageing test .12
Figure B.1 – Climatic test room.15

Table C.1 – Example of typical environment .16

TS 62271-304 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 304: Design classes for indoor enclosed
switchgear and controlgear for rated voltages above 1 kV up to and
including 52 kV to be used in severe climatic conditions

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
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.
The main task of IEC technical committees is to prepare International Standards. In
exceptional circumstances, a technical committee may propose the publication of a technical
specification when
• the required support cannot be obtained for the publication of an International Standard,
despite repeated efforts, or
• the subject is still under technical development or where, for any other reason, there is the
future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 62771-304, which is a technical specification, has been prepared by subcommittee 17C:
High-voltage switchgear and controlgear assemblies, of IEC technical committee 17:
Switchgear and controlgear.
– 4 – TS 62271-304 © IEC:2008
The text of this technical specification is based on the following documents:
Enquiry draft Report on voti
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