SIST EN 60950-22:2007
(Main)Information technology equipment - Safety -- Part 22: Equipment installed outdoors
Information technology equipment - Safety -- Part 22: Equipment installed outdoors
This part of IEC 60950 applies to information technology equipment intended to be installed in an OUTDOOR LOCATION. The requirements for OUTDOOR EQUIPMENT also apply, where relevant, to empty OUTDOOR ENCLOSURES supplied for housing information technology equipment to be installed in an OUTDOOR LOCATION. Each installation may have particular requirements. Some examples are given in 4.2. In addition, requirements for protection of the OUTDOOR EQUIPMENT against the effects of direct lightning strikes are not covered by the standard. For information on this subject, see IEC 61024-1.
Einrichtungen der Informationstechnik - Sicherheit -- Teil 22: Einrichtungen für den Außenbereich
Matériels de traitement de l'information - Sécurité -- Partie 22: Matériels destinés à être installés à l'extérieur
S'applique aux matériels de traitement de l'information destinés à être installés dans un EMPLACEMENT D'INSTALLATION EXTERIEURE. Les exigences pour les MATERIELS POUR INSTALLATION EXTERIEURE s'appliquent également, s'il y a lieu, aux ENVELOPPES POUR INSTALLATION EXTERIEURE vides fournies pour loger les matériels de traitement de l'information destinés à être installés dans un EMPLACEMENT D'INSTALLATION EXTERIEURE.
Oprema za informacijsko tehnologijo - Varnost - 22. del: Oprema na prostem (IEC 60950-22:2005, spremenjen) (vsebuje popravek AC:2008)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60950-22:2007
01-januar-2007
Oprema za informacijsko tehnologijo - Varnost - 22. del: Oprema na prostem (IEC
60950-22:2005, spremenjen) (vsebuje popravek AC:2008)
Information technology equipment - Safety -- Part 22: Equipment installed outdoors
Einrichtungen der Informationstechnik - Sicherheit -- Teil 22: Einrichtungen für den
Außenbereich
Matériels de traitement de l'information - Sécurité -- Partie 22: Matériels destinés à être
installés à l'extérieur
Ta slovenski standard je istoveten z: EN 60950-22:2006
ICS:
35.020 Informacijska tehnika in Information technology (IT) in
tehnologija na splošno general
SIST EN 60950-22:2007 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60950-22:2007
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SIST EN 60950-22:2007
EUROPEAN STANDARD
EN 60950-22
NORME EUROPÉENNE
April 2006
EUROPÄISCHE NORM
ICS 35.020; 29.020
Incorporates corrigendum October 2008
English version
Information technology equipment -
Safety
Part 22: Equipment installed outdoors
(IEC 60950-22:2005, modified)
Matériels de traitement de l'information - Einrichtungen der Informationstechnik -
Sécurité Sicherheit
Partie 22: Matériels destinés Teil 22: Einrichtungen
à être installés à l'extérieur für den Außenbereich
(CEI 60950-22:2005, modifiée) (IEC 60950-22:2005, modifiziert)
This European Standard was approved by CENELEC on 2005-12-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, 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
© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60950-22:2006 E
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SIST EN 60950-22:2007
EN 60950-22:2006 - 2 -
Foreword
The text of document 108/145//FDIS, future edition 1 of IEC 60950-22, prepared by IEC TC 108, Safety of
electronic equipment within the field of audio/video, information technology and communication
technology, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 60950-22 on 2005-12-01.
A draft amendment, prepared by the Technical Committee CENELEC/TC 108, Safety of electronic
equipment within the fields of audio/video, information technology and communication technology, was
submitted to the formal vote and was approved by CENELEC for inclusion in EN 60950-22 on 2005-12-01.
The following dates were fixed:
− latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2006-12-01
national standard or by endorsement
− latest date by which the national standards conflicting
(dow) 2010-12-01
with the EN have to be withdrawn
This Part 22 of EN 60950 is intended to be used with EN 60950-1. The subclauses of EN 60950-1 apply
as is reasonable. Where safety aspects are similar to those of Part 1, the relevant Part 1 clause or
subclause is shown for reference in parentheses after the clause or subclause title in Part 22. Where a
requirement in Part 22 refers to a requirement or criterion of Part 1, a specific reference to EN 60950-1 is
made.
EN 60950 consists of the following parts, under the general title Information technology equipment –
Safety:
Part 1: General requirements;
Part 21: Remote power feeding;
Part 22: Equipment installed outdoors;
Part 23: Large data storage equipment.
In this standard, the following print types are used:
– requirements proper and normative annexes: roman type;
– compliance statements and test specifications: italic type;
– notes in the text and in tables: smaller roman type;
– terms that are defined in Clause 2 and in EN 60950-1: SMALL CAPITALS.
Annexes ZA and ZB have been added by CENELEC.
The contents of the corrigendum of October 2008 have been included in this copy.
__________
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SIST EN 60950-22:2007
- 3 - EN 60950-22:2006
Endorsement notice
The text of the International Standard IEC 60950-22:2005 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
COMMON MODIFICATIONS
Contents Add the following annexes:
Annex ZA (normative) Normative references to international publications with their
corresponding European publications
Annex ZB (normative) Special national conditions
Delete all the "country" notes in IEC 60950-22:2005 according to the following list:
– 4.1 Note 3
– 4.3 Note
– 8.5 Note
– 10.2 Note
– D.3 Note
– D.4 Note
For special national conditions, see Annex ZB.
Bibliography Add the following notes for the standards indicated:
IEC 60364-1 NOTE Harmonized as HD 384.1 S2:2001 (modified).
IEC 60364-4-44 NOTE Partly harmonized as HD 60364-4-443:2006 (modified),
HD 384.4.442 S1:1997 (related) and R064-004:1999 (IEC 60364-4-444:1996, modified).
IEC 60439-5 NOTE Harmonized as EN 60439-5:1996 + A1:1998 (not modified).
IEC 60664-1 NOTE Harmonized as EN 60664-1:2003 (not modified).
IEC 60721-3-4 NOTE Harmonized as EN 60721-3-4:1995 (not modified).
IEC 61587-1 NOTE Harmonized as EN 61587-1:1999 (not modified).
IEC 61969-3 NOTE Harmonized as EN 61969-3:2001 (not modified).
__________
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SIST EN 60950-22:2007
EN 60950-22:2006 - 4 -
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 amendment) 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
IEC 60068-2-11 1981 Environmental testing EN 60068-2-11 1999
Part 2: Tests - Test Ka: Salt mist
IEC 60364 Series Electrical installations of buildings HD 384/ Series
(mod) HD 60364
1)
IEC 60364-4-43 2001 Part 4-43: Protection for safety - Protection -
-
against overcurrent
2) 3)
IEC 60529 Degrees of protection provided by enclosures EN 60529
- 1991
(IP Code) + corr. May
1993
IEC 60950-1 2005 Information technology equipment - Safety EN 60950-1 2006
(mod) Part 1: General requirements
IEC 61643 Series Low-voltage surge protective device EN 61643 Series
(mod)
2) 3)
ISO 178 Plastics - Determination of flexural properties EN ISO 178
- 2003
ISO 179 Series Plastics - Determination of Charpy impact EN ISO 179 Series
strength
2) 3)
ISO 180 Plastics - Determination of Izod impact EN ISO 180
- 2000
strength
ISO 527 Series Plastics - Determination of tensile properties EN ISO 527 Series
2) 3)
ISO 3231 Paints and varnishes - Determination of EN ISO 3231
- 1997
resistance to humid atmospheres containing
sulfur dioxide
———————
1)
IEC 60364-4-43:1977 + A1:1997 (modified) are harmonized as HD 384.4.43 S2:2001.
2)
Undated reference.
3)
Valid edition at date of issue.
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SIST EN 60950-22:2007
- 5 - EN 60950-22:2006
Publication Year Title EN/HD Year
2) 3)
ISO 4628-3 Paints and varnishes - Evaluation of EN ISO 4628-3
- 2003
degradation of paint coatings - Designation of
intensity, quantity and size of common types
of defect
Part 3: Designation of degree of rusting
2) 3)
ISO 4892-1 Plastics - Methods of exposure to laboratory EN ISO 4892-1
- 2000
light sources
Part 1: General guidance
2) 3)
ISO 4892-2 Part 2: Xenon-arc sources EN ISO 4892-2
- 1999
2)
ISO 4892-4 Part 4: Open-flame carbon-arc lamps – –
-
2) 3)
ISO 8256 Plastics - Determination of tensile-impact EN ISO 8256
- 2004
strength
ISO 18173 2005 Non-destructive testing - General terms and – –
definitions
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SIST EN 60950-22:2007
EN 60950-22:2006 - 6 -
Annex ZB
(normative)
Special national conditions
Special national condition: National characteristic or practice that cannot be changed even over a long
period, e.g. climatic conditions, electrical earthing conditions.
NOTE If it affects harmonization, it forms part of the European Standard or Harmonization Document.
For the countries in which the relevant special national condition apply these provisions are normative, for
other countries they are informative.
Subclause Special national condition
4.1 In Finland, Norway and Sweden, the temperature in winter may be extremely low. For
OUTDOOR EQUIPMENT this will demand special design so that the equipment can
withstand transport, erection and operation/service at temperatures down to -50 °C.
10.2 In Finland, Norway and Sweden there are additional requirements for the minimum
ambient temperature. See 4.1 of this annex.
D.3 In Finland, Norway and Sweden there are additional requirements for the minimum
ambient temperature. See 4.1 of this annex.
__________
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SIST EN 60950-22:2007
NORME CEI
INTERNATIONALE
IEC
60950-22
INTERNATIONAL
Première édition
STANDARD
First edition
2005-10
Matériels de traitement de l'information –
Sécurité –
Partie 22:
Matériels destinés à être installés à l'extérieur
Information technology equipment –
Safety –
Part 22:
Equipment to be installed outdoors
IEC 2005 Droits de reproduction réservés Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
U
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
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SIST EN 60950-22:2007
60950-22 IEC:2005 – 3 –
CONTENTS
FOREWORD.7
INTRODUCTION.11
1 Scope.13
1.1 Equipment covered.13
1.2 Additional requirements.13
2 Normative references .13
3 Terms and definitions .15
4 Conditions for outdoor equipment .17
4.1 Ambient air temperature .17
4.2 AC mains supply .17
4.3 Rise of earth potential .19
5 Marking and instructions.19
6 Protection from electrical shock in an outdoor location .19
6.1 Voltage limits of user-accessible parts in outdoor locations .19
6.2 Limited current circuits in outdoor locations.21
7 Wiring terminals for connection of external conductors .21
8 Construction requirements for outdoor enclosures .21
8.1 General .21
8.2 Resistance to ultra-violet radiation .21
8.3 Resistance to corrosion .23
8.4 Bottoms of fire enclosures .25
8.5 Gaskets.25
9 Protection of equipment within an outdoor enclosure .27
9.1 Protection from moisture .27
9.2 Protection from plants and vermin .31
9.3 Protection from excessive dust.31
10 Mechanical strength of enclosures.31
10.1 General .31
10.2 Impact test .31
11 Outdoor equipment containing vented batteries .31
Annex A (normative) Water – saturated sulphur dioxide atmosphere.35
Annex B (normative) Water spray test.37
Annex C (normative) Ultraviolet light conditioning test .43
Annex D (normative) Gasket tests.45
Annex E (informative) Rationale.49
Bibliography.55
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SIST EN 60950-22:2007
60950-22 IEC:2005 – 5 –
Figure B.1 – Water-spray test spray-head piping.39
Figure B.2 – Water-spray test spray head .41
Figure D.1 – Gasket test .47
Table 1 – Minimum property retention limits after UV exposure.23
Table 2 – Examples of the provision of pollution degree environments.29
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SIST EN 60950-22:2007
60950-22 IEC:2005 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INFORMATION TECHNOLOGY EQUIPMENT –
SAFETY –
Part 22: Equipment to be installed outdoors
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.
International Standard IEC 60950-22 has been prepared by IEC TC 108 Safety of electronic
equipment within the field of audio/video, information technology and communication
technology.
The text of this standard is based on the following documents:
FDIS Report on voting
108/145/FDIS 108/151/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.
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SIST EN 60950-22:2007
60950-22 IEC:2005 – 9 –
This Part 22 of IEC 60950 is intended to be used with IEC 60950-1. The subclauses of
IEC 60950-1 apply as far as reasonable. Where safety aspects are similar to those of Part 1
the relevant Part 1 clause or subclause is shown for reference in parentheses after the clause
or subclause title in Part 22. Where a requirement in Part 22 refers to a requirement or
criterion of Part 1, a specific reference to IEC 60950-1, is made.
IEC 60950 consists of the following parts, under the general title Information technology
equipment – Safety:
Part 1: General requirements
Part 21: Remote power feeding
Part 22: Equipment installed outdoors
Part 23: Large data storage equipment
In this standard, the following print types are used:
– requirements proper and normative annexes: roman type;
– compliance statements and test specifications: italic type;
– notes in the text and in tables: smaller roman type;
– terms that are defined on Clause 2 and in IEC 60950-1: SMALL CAPITALS.
The committee has decided that the contents of this publication will remain unchanged until
the maintenance result 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.
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SIST EN 60950-22:2007
60950-22 IEC:2005 – 11 –
INTRODUCTION
This document proposes safety requirements for information technology equipment intended
to be installed, when exposed wholly or partly, in a location where protection from the weather
and other outdoor influences such as rain, dust, etc. normally provided by a building or other
structure is limited or non-existent. There are many examples of information technology
equipment in use throughout the world that are housed in special ENCLOSURES located on
pavements, mounted on telecommunications poles and situated underground. Presently,
IEC 60950 has no requirements for such equipment and this proposal would rectify this
omission. The proposed requirements would not apply to portable or transportable equipment
that may be occasionally used outdoors, but are not intended to be installed in conditions of
inclement weather.
It is expected that IEC TC108 will continue to coordinate the output of its work with other
technical committees dealing with equipment installed outdoors, such as IEC TC70 (Degrees
of Protection by Enclosures, responsible for IEC 60529) and IEC TC48 (Electromechanical
Components and Mechanical Structures for Electronic Equipment).
Annex E describes the rationale behind the treatment of specific safety aspects in this
standard.
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SIST EN 60950-22:2007
60950-22 IEC:2005 – 13 –
INFORMATION TECHNOLOGY EQUIPMENT –
SAFETY –
Part 22: Equipment to be installed outdoors
1 Scope
1.1 Equipment covered
This part of IEC 60950 applies to information technology equipment intended to be installed in
an OUTDOOR LOCATION.
The requirements for OUTDOOR EQUIPMENT also apply, where relevant, to empty OUTDOOR
ENCLOSURES supplied for housing information technology equipment to be installed in an
OUTDOOR LOCATION.
1.2 Additional requirements
Each installation may have particular requirements. Some examples are given in 4.2. In
addition, requirements for protection of the OUTDOOR EQUIPMENT against the effects of direct
lightning strikes are not covered by the standard. For information on this subject, see
IEC 61024-1.
2 Normative references
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.
IEC 60068-2-11:1981, Environmental testing – Part 2: Tests. Test Ka: Salt mist
IEC 60364 (all parts), Electrical installations of buildings
IEC 60364-4-43:2001, Electrical installations of buildings – Part 4-43: Protection for safety –
Protection against overcurrent
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60950-1:2005, Information technology equipment – Safety – Part 1: General requirements
IEC 61643 (all parts), Low-voltage surge protective devices
ISO 178, Plastics – Determination of flexural properties
ISO 179 (all parts), Plastics – Determination of Charpy impact strength
ISO 180, Plastics – Determination of Izod impact strength
ISO 527 (all parts), Plastics – Determination of tensile properties
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SIST EN 60950-22:2007
60950-22 IEC:2005 – 15 –
ISO 3231, Paints and varnishes – Determination of resistance to humid atmospheres
containing sulfur dioxide
ISO 4628-3, Paints and varnishes – Evaluation of degradation of coatings – Designation of
quantity and size of defects, and of intensity of uniform changes in appearance – Part 3:
Assessment of degree of rusting
ISO 4892-1, Plastics – Methods of exposure to laboratory light sources – General guidance
ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Xenon-arc sources
ISO 4892-4, Plastics – Methods of exposure to laboratory light sources – Open-flame carbon-
arc lamps
ISO 8256, Plastics – Determination of tensile-impact strength
ISO 18173:2005 Non-destructive testing – General terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60950-1 and the
following apply.
3.1
OUTDOOR LOCATION
location for equipment where protection from the weather and other outdoor influences
provided by a building or other structure is limited or non-existent
3.2
OUTDOOR EQUIPMENT
equipment specified by the manufacturer to be installed where exposed wholly or partly to the
conditions in an OUTDOOR LOCATION
NOTE TRANSPORTABLE EQUIPMENT, for example, a laptop or notebook computer, or a telephone, is not OUTDOOR
EQUIPMENT unless specified by the manufacturer for continuous use in an OUTDOOR LOCATION.
3.3
OUTDOOR ENCLOSURE
part of OUTDOOR EQUIPMENT that is exposed to the adverse conditions in an OUTDOOR LOCATION
and that is intended to protect the interior of the equipment from those conditions
NOTE 1 An OUTDOOR ENCLOSURE can also perform the functions of one or more of the following: a FIRE
ENCLOSURE; an ELECTRICAL ENCLOSURE; a MECHANICAL ENCLOSURE.
NOTE 2 A separate cabinet or housing into which the equipment is placed can provide the function of an
OUTDOOR ENCLOSURE.
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SIST EN 60950-22:2007
60950-22 IEC:2005 – 17 –
4 Conditions for outdoor equipment
4.1 Ambient air temperature
OUTDOOR EQUIPMENT and OUTDOOR ENCLOSURES shall be suitable for use at any temperature in
the range specified by the manufacturer. If not specified by the manufacturer, the range shall
be taken as:
– minimum ambient temperature; –33 ºC
– maximum ambient temperature; +40 ºC.
Compliance is checked by inspection.
NOTE 1 The temperature values are based on IEC 60721-3-4 Class 4K2. These temperatures do not take into
account severe environments (for example, extremely cold or extremely warm), nor do they include provision for
heating by radiation from the sun (solar loading).
.
NOTE 2 Attention is drawn to IEC 61587-1 for additional information on performance levels C1, C2 and C3
NOTE 3 In Finland, Norway and Sweden, the temperature in winter may be extremely low. For OUTDOOR
EQUIPMENT this will demand special design so that the equipment can stand transport, erection and
operation/service at temperatures down to –50 °C.
4.2 AC mains supply
Mains-operated OUTDOOR EQUIPMENT shall be suitable for the highest Overvoltage Category
expected in the installation location.
Consideration shall be given to the following:
– the prospective fault current of the supply to OUTDOOR EQUIPMENT can be higher than for
indoor equipment, see IEC 60364-4-43; and
– the Overvoltage Category for OUTDOOR EQUIPMENT can be higher than for indoor equipment.
Equipment that is part of the building installation, or that may be subject to transient
overvoltages exceeding those for Overvoltage Category II, shall be designed for Overvoltage
Category III or IV, unless additional protection is to be provided internal or external to the
equipment. In this case, the installation instructions shall state the need for such additional
protection.
It is permitted to include components within OUTDOOR EQUIPMENT that reduce the Overvoltage
Category or the prospective fault current. Components used to reduce the Overvoltage Category
shall comply with the requirements of IEC 61643-series.
NOTE 1 Annex G of IEC 60950-1 only provides a method of determining minimum CLEARANCES for transient
voltages corresponding to Overvoltage Categories III and IV. Other parts of the insulation system, for example
requirements for solid insulation and for electric strength testin
...
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