High-voltage switchgear and controlgear - Part 214: Internal arc classification for pole-mounted switchgear for rated voltages above 1 kV and up to and including 52 kV (IEC 62271-214:2019)

This document specifies requirements for internal arc classification of metal-enclosed pole-mounted switchgear installations used for alternating current with rated voltages above 1 kV and up to and including 52 kV with service frequencies up to and including 60 Hz. This document is applicable to three-phase, two-phase and single phase equipment. Enclosures may include fixed and removable components and may be filled with fluid (liquid or gas) to provide insulation. NOTE For the use of this document high-voltage (IEC 60050-601:1985, 601-01-27) is the rated voltage above 1 000 V. However, medium voltage (IEC 60050-601:1985, 601-01-28) is commonly used for distribution systems with voltages above 1 kV and generally applied up to and including 52 kV; refer to [1] of the Bibliography. This document does not preclude that other equipment may be included in the same enclosure. In such a case, any possible influence of that equipment on the switchgear and controlgear is to be taken into account.

Hochspannungs-Schaltgeräte und -Schaltanlagen – Teil 214: Störlichtbogenklassifikation für metallgekapselte, mastmontierte Schaltanlagen für Bemessungsspannungen über 1 kV bis einschließlich 52 kV (IEC 62271-214:2019)

Appareillage à haute tension - Partie 214: Classification arc interne des appareillages sous enveloppe métallique de tensions assignées supérieures à 1 kV et inférieures ou égales à 52 kV montés sur poteau (IEC 62271-214:2019)

L’IEC 62271-214:2019 spécifie les exigences relatives à la classification arc interne des appareillages sous enveloppe métallique montés sur poteau, utilisés pour du courant alternatif, de tensions assignées supérieures à 1 kV et inférieures ou égales à 52 kV, et de fréquences de service inférieures ou égales à 60 Hz. Le présent document s’applique aux équipements triphasés, biphasés et monophasés. Les enveloppes peuvent comprendre des composants fixes et amovibles et peuvent être remplies de fluide (liquide ou gaz) pour l’isolation.

Visokonapetostne stikalne in krmilne naprave - 214. del: Razvrščanje notranjih oblokov pri krmilnih napravah, nameščenih na drogovih, za napetosti nad 1 kV do vključno 52 kV (IEC 62271-214:2019)

Ta dokument določa zahteve za razvrščanje notranjih oblokov pri inštalacijah stikalnih naprav v kovinskem ohišju, nameščenih na drogu, ki se uporabljajo za izmenični tok z naznačenimi napetostmi nad 1 kV do vključno 52 kV s frekvencami delovanja do vključno 60 Hz. Ta dokument se uporablja za trifazno, dvofazno in enofazno opremo. Okrovi lahko zajemajo fiksne in premične dele in so lahko za izolacijo napolnjeni s tekočino (kapljevino ali plinom). OPOMBA: V tem dokumentu je visoka napetost (IEC 60050-601:1985, 601-01-27) nazivna napetost nad 1000 V. Srednja napetost (IEC 60050-601:1985, 601-01-28) se običajno uporablja v razdelilnih sistemih z napetostmi nad 1 kV in vključno do 52 kV; glej točko [1] v bibliografiji. Ta dokument ne izključuje vključitve druge opreme v istem ohišju. V takem primeru je treba upoštevati morebiten vpliv take opreme na stikalno in krmilno napravo.

General Information

Status
Published
Publication Date
17-Sep-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Sep-2019
Due Date
18-Nov-2019
Completion Date
18-Sep-2019

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SLOVENSKI STANDARD
SIST EN IEC 62271-214:2019
01-november-2019
Visokonapetostne stikalne in krmilne naprave - 214. del: Razvrščanje notranjih
oblokov pri krmilnih napravah, nameščenih na drogovih, za napetosti nad 1 kV do
vključno 52 kV (IEC 62271-214:2019)

High-voltage switchgear and controlgear - Part 214: Internal arc classification for pole-

mounted switchgear for rated voltages above 1 kV and up to and including 52 kV (IEC

62271-214:2019)

Hochspannungs-Schaltgeräte und -Schaltanlagen – Teil 214: Störlichtbogenklassifikation

für metallgekapselte, mastmontierte Schaltanlagen für Bemessungsspannungen über 1

kV bis einschließlich 52 kV (IEC 62271-214:2019)

Appareillage à haute tension - Partie 214: Classification arc interne des appareillages

sous enveloppe métallique de tensions assignées supérieures à 1 kV et inférieures ou

égales à 52 kV montés sur poteau (IEC 62271-214:2019)
Ta slovenski standard je istoveten z: EN IEC 62271-214:2019
ICS:
29.130.10 Visokonapetostne stikalne in High voltage switchgear and
krmilne naprave controlgear
SIST EN IEC 62271-214:2019 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN IEC 62271-214:2019
---------------------- Page: 2 ----------------------
SIST EN IEC 62271-214:2019
EUROPEAN STANDARD EN IEC 62271-214
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2019
ICS 29.130.10
English Version
High-voltage switchgear and controlgear - Part 214: Internal arc
classification for metal-enclosed pole-mounted switchgear and
controlgear for rated voltages above 1 kV and up to and
including 52 kV
(IEC 62271-214:2019)

Appareillage à haute tension - Partie 214: Classification arc Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil

interne des appareillages sous enveloppe métallique de 214: Störlichtbogenklassifikation für metallgekapselte,

tensions assignées supérieures à 1 kV et inférieures ou mastmontierte Schaltanlagen für Bemessungsspannungen

égales à 52 kV montés sur poteau über 1 kV bis einschließlich 52 kV
(IEC 62271-214:2019) (IEC 62271-214:2019)

This European Standard was approved by CENELEC on 2019-07-25. 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 CEN-CENELEC

Management Centre 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 CEN-CENELEC Management Centre has the

same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,

Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the

Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN IEC 62271-214:2019 E
---------------------- Page: 3 ----------------------
SIST EN IEC 62271-214:2019
EN IEC 62271-214:2019 (E)
European foreword

The text of document 17C/706/FDIS, future edition 1 of IEC 62271-214, prepared by SC 17C

"Assemblies" of IEC/TC 17 "High-voltage switchgear and controlgear" was submitted to the IEC-

CENELEC parallel vote and approved by CENELEC as EN IEC 62271-214:2019.
The following dates are fixed:

• latest date by which the document has to be implemented at national (dop) 2020-04-25

level by publication of an identical national standard or by endorsement

• latest date by which the national standards conflicting with the (dow) 2022-07-25

document have to be withdrawn

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice

The text of the International Standard IEC 62271-214:2019 was approved by CENELEC as a

European Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards

indicated:
IEC 60060-1:2010 NOTE Harmonized as EN 60060-1:2010 (not modified)
IEC 60529:1989 NOTE Harmonized as EN 60529:1991 (not modified)
IEC 60909-0:2016 NOTE Harmonized as EN 60909-0:2016 (not modified)
IEC 60243-1:2013 NOTE Harmonized as EN 60243-1:2013 (not modified)
IEC 62271-100 NOTE Harmonized as EN 62271-100
IEC 62271-102 NOTE Harmonized as EN IEC 62271-102
IEC 62271-103 NOTE Harmonized as EN 62271-103
IEC 62271-203:2013 NOTE Harmnoized as EN 62271-203:2013 (not modified)
IEC/TR 62271-307 NOTE Harmonized as CLC IEC/TR 62271-307
IEC 60038:2009 NOTE Harmonized as EN 60038:2011
IEC 60059:1999 NOTE Harmonized as EN 60059:1999 (not modified)
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SIST EN IEC 62271-214:2019
EN IEC 62271-214:2019 (E)
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 Where an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-151 2001 International Electrotechnical Vocabulary - Part - -
151: Electrical and magnetic devices
IEC 60050-441 1984 International Electrotechnical Vocabulary. - -
Switchgear, controlgear and fuses

IEC 62271-1 2017 High-voltage switchgear and controlgear - Part 1: EN 62271-1 2017

Common specifications for alternating current
switchgear and controlgear
---------------------- Page: 5 ----------------------
SIST EN IEC 62271-214:2019
---------------------- Page: 6 ----------------------
SIST EN IEC 62271-214:2019
IEC 62271-214
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 214: Internal arc classification for metal-enclosed pole-mounted switchgear
and controlgear for rated voltages above 1 kV and up to and including 52 kV
Appareillage à haute tension –
Partie 214: Classification arc interne des appareillages sous enveloppe
métallique de tensions assignées supérieures à 1 kV et inférieures ou égales à
52 kV montés sur poteau
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-6996-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN IEC 62271-214:2019
– 2 – IEC 62271-214:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 7

3.1 General terms and definitions ................................................................................. 8

4 Normal and special service conditions ........................................................................... 10

4.1 General ................................................................................................................. 10

5 Ratings .......................................................................................................................... 10

5.1 General ................................................................................................................. 10

5.2 Rated voltage (U ) ................................................................................................ 10

5.2.1 General ......................................................................................................... 10

5.3 Rated insulation level (U , U , U ) ....................................................................... 10

d p s

5.4 Rated frequency (f ) .............................................................................................. 10

5.101 Ratings of the internal arc classification (IAC) ....................................................... 10

5.101.1 General ......................................................................................................... 10

5.101.2 Rated approach distance (D ) ..................................................................... 10

5.101.3 Rated arc fault currents (I , I ) ................................................................... 11

A Ae

5.101.4 Rated arc fault duration (t , t ) ................................................................... 11

A Ae

6 Design and construction ................................................................................................ 11

6.11 Nameplate ............................................................................................................ 11

6.11.1 General ......................................................................................................... 11

6.101 Internal arc fault .................................................................................................... 12

6.102 Enclosure ............................................................................................................. 12

7 Type tests ..................................................................................................................... 13

7.1 General ................................................................................................................. 13

7.1.1 Basics ........................................................................................................... 13

7.1.2 Information for identification of test object ..................................................... 13

7.1.3 Information to be included in type-test reports ............................................... 14

7.101 Internal arc type test ............................................................................................. 14

7.101.1 General ......................................................................................................... 14

7.101.2 Test conditions .............................................................................................. 15

7.101.3 Arrangement of the equipment ....................................................................... 15

7.101.4 Indicators (for assessing the thermal effects of the gases) ............................. 17

7.101.5 Arrangement of indicators .............................................................................. 17

7.101.6 Test parameters ............................................................................................ 17

7.101.7 Test procedure .............................................................................................. 19

7.101.8 Criteria to pass the test ................................................................................. 23

7.101.9 Transferability of the test results .................................................................... 23

8 Routine tests ................................................................................................................. 24

9 Guide to the selection of switchgear and controlgear ..................................................... 24

9.1 General ................................................................................................................. 24

9.101 Internal arc fault .................................................................................................... 24

9.101.1 General ......................................................................................................... 24

9.101.2 Causes and preventive measures .................................................................. 24

9.101.3 Supplementary protective measures .............................................................. 25

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SIST EN IEC 62271-214:2019
IEC 62271-214:2019 © IEC 2019 – 3 –

9.101.4 Considerations for the selection and installation ............................................ 26

9.101.5 Internal arc test ............................................................................................. 26

9.101.6 IAC designation ............................................................................................. 26

10 Information to be given with enquiries, tenders and orders (informative) ........................ 27

10.1 General ................................................................................................................. 27

11 Transport, storage, installation, operation instruction and maintenance ......................... 27

11.1 General ................................................................................................................. 27

11.2 Conditions during transport, storage and installation ............................................. 27

11.3 Installation ............................................................................................................ 28

11.3.1 General ......................................................................................................... 28

11.101 Maintenance ......................................................................................................... 28

11.101.1 General ......................................................................................................... 28

12 Safety ............................................................................................................................ 28

12.1 General ................................................................................................................. 28

13 Influence of the product on the environment .................................................................. 28

Annex A (normative) Identification of the test objects ........................................................... 29

A.1 General ................................................................................................................. 29

A.2 Data ...................................................................................................................... 29

A.3 Drawings............................................................................................................... 29

Bibliography .......................................................................................................................... 30

Figure 1 – Examples of enclosures and compartment(s) in different arrangements ............... 13

Figure 2 –Test arrangement for pole-mounted switchgear and controlgear ........................... 16

Figure 3 – Horizontal indicator .............................................................................................. 17

Figure 4 – Flow-chart for the choice of arc initiation depending on the construction .............. 21

Table 1 – Nameplate information .......................................................................................... 12

Table 2 – Parameters for internal fault test according to enclosure and compartment

construction .......................................................................................................................... 20

Table 3 – Locations, causes and examples of measures to decrease the probability of

internal arc faults .................................................................................................................. 25

Table 4 – Single phase-to-earth arc fault current depending on the network neutral

earthing ................................................................................................................................ 27

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SIST EN IEC 62271-214:2019
– 4 – IEC 62271-214:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 214: Internal arc classification for metal-enclosed pole-mounted
switchgear and controlgear for rated voltages above 1 kV and up to
and including 52 kV
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 62271-214 has been prepared by subcommittee 17C Assemblies,

of IEC technical committee 17: Switchgear and controlgear.
The text of this International Standard is based on the following documents:
FDIS Report on voting
17C/706/FDIS 17C/710/RVD

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

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SIST EN IEC 62271-214:2019
IEC 62271-214:2019 © IEC 2019 – 5 –

This standard shall be read in conjunction with IEC 62271-1, second edition, published in

2017, to which it refers and which is applicable unless otherwise specified in this standard. In

order to simplify the indication of corresponding requirements, the same numbering of clauses

and subclauses is used as in IEC 62271-1. Amendments to these clauses and subclauses are

given under the same references whilst additional subclauses are numbered from 101. Any

clause with the term “Not Applicable” relates to the clause not being relevant to IEC 62271-

214 and does not infer the clause is or is not relevant for its applicable switchgear standard.

A list of all parts of the IEC 62271 series, published under the general title High-voltage

switchgear and controlgear, can be found on the IEC website.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
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SIST EN IEC 62271-214:2019
– 6 – IEC 62271-214:2019 © IEC 2019
INTRODUCTION

IEC 62271-214 has been developed due to the requirement to remove IAC Type C designated

pole mounted switchgear from IEC 62271-200. Only enclosed terminal equipment is to be

considered within IEC 62271-200. For this reason, IEC 62271-214 is to be considered

independent of IEC 62271-200, however it is still related to other product standards of the

IEC 62271 series.

Only open terminal pole mounted switchgear has been considered within this document.

This equipment relates to operation in three-phase, two-phase and single-phase systems.

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SIST EN IEC 62271-214:2019
IEC 62271-214:2019 © IEC 2019 – 7 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –
Part 214: Internal arc classification for metal-enclosed pole-mounted
switchgear and controlgear for rated voltages above 1 kV and up to
and including 52 kV
1 Scope

This part of IEC 62271 specifies requirements for internal arc classification of metal-enclosed

pole-mounted switchgear installations used for alternating current with rated voltages above

1 kV and up to and including 52 kV with service frequencies up to and including 60 Hz. This

document is applicable to three-phase, two-phase and single phase equipment. Enclosures

may include fixed and removable components and may be filled with fluid (liquid or gas) to

provide insulation.

NOTE For the use of this document high-voltage (IEC 60050-601:1985, 601-01-27) is the rated voltage above

1 000 V. However, medium voltage (IEC 60050-601:1985, 601-01-28) is commonly used for distribution systems

with voltages above 1 kV and generally applied up to and including 52 kV; refer to [1] of the Bibliography.

This document does not preclude that other equipment may be included in the same

enclosure. In such a case, any possible influence of that equipment on the switchgear and

controlgear is to be taken into account.
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 60050-151:2001, International Electrotechnical Vocabulary – Part 151: Electrical and

magnetic devices

IEC 60050-441:1984, International Electrotechnical Vocabulary – Part 441: Switchgear,

controlgear and fuses

IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications

for alternating current switchgear and controlgear
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-151,

IEC 60050-441 and IEC 62271-1 as well as the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://electropedia.org
• ISO Online browsing platform: available at http://www.iso.org/obp

NOTE Additional definitions are classified so as to be aligned with the classification system used in

IEC 60050-441.
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SIST EN IEC 62271-214:2019
– 8 – IEC 62271-214:2019 © IEC 2019
3.1 General terms and definitions
3.1.101
metal-enclosed switchgear and controlgear

switchgear and controlgear assemblies with an external metal enclosure intended to be

earthed and completely assembled, except for external connections
[SOURCE: IEC 60050-441:1984, 441-12-04, modified – NOTE has been deleted]
3.1.102
functional unit

part of pole-mounted switchgear and controlgear comprising all the components of the

main circuits and auxiliary circuits that contribute to the fulfilment of a single function

Note 1 to entry: Functional units are distinguished according to the function for which they are intended, e.g.

incoming unit, outgoing unit, etc.

[SOURCE: IEC 60050-441:1984, 441-13-04, modified – references to the supply and feed

sides in the note has been deleted]
3.1.103
enclosure

part of an assembly providing a specified degree of protection of equipment against external

influences and a specified degree of protection against approach to or contact with live parts

and against contact with moving parts
[SOURCE: IEC 60050-441:1984, 441-13-01]
3.1.104
high-voltage compartment

compartment of switchgear and controlgear, containing high-voltage conducting parts,

enclosed except for openings necessary for interconnection, control or ventilation, where one

segment of the compartment can be part of the outer earthed metallic enclosure
3.1.105
component

essential part of the high-voltage or earthing circuits of pole-mounted switchgear and

controlgear which serves a specific function

EXAMPLE Circuit-breaker, disconnector, switch, fuse, instrument transformer, bushing, busbar.

3.1.106
main circuit

all the high-voltage conductive parts of pole-mounted switchgear and controlgear included in

a circuit which is intended to carry the rated continuous current

[SOURCE: IEC 60050-441:1984, 441-13-02, modified – “high voltage” has been added,

“assembly” has been substituted by “pole mounted switchgear and controlgear” and “transmit

electrical energy” has been substituted by “carry the rated continuous current”.]

3.1.107
earthing circuit

conductors, connections, and the conducting parts of earthing devices intended to connect the

high-voltage conductive parts to the earthing system of the installation

Note 1 to entry: Parts of metallic enclosures connected to the earthing system can be part of the earthing circuit.

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SIST EN IEC 62271-214:2019
IEC 62271-214:2019 © IEC 2019 – 9 –
3.1.108
pressure relief device

device incorporated as part of an enclosure or compartment intended to operate to prevent

excessive pressure in the enclosure or compartment
3.1.109
fluid-filled compartment

high-voltage compartment of pole-mounted switchgear and controlgear filled with a fluid,

either gas, other than ambient air, or liquid, for insulation purposes
3.1.110
pole

vertical single member support in wood, concrete, steel or other material, with one end buried

in the ground, either directly or by means of a foundation

Note 1 to entry: The term pole as defined here is not to be mixed up with the use of the same term as

synonymous for phase as used in other standards.

[SOURCE: IEC 60050-466:1990, 466-07-01, modified – Note 1 to entry has been added]

3.1.111
pole-mounted switchgear and controlgear

switchgear and controlgear, typically connected to overhead lines, installed on one or more

poles or equivalent structures at a defined height, with restricted accessibility by installatio

...

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