SIST EN IEC 62271-214:2024

SLOVENSKI STANDARD
01-julij-2024
Visokonapetostne stikalne in krmilne naprave - 214. del: Razvrščanje notranjih
oblokov pri stikalnih in krmilnih napravah AC, nameščenih na kovinskih drogovih,
za naznačene napetosti nad 1 kV do vključno 52 kV (IEC 62271-214:2024)
High-voltage switchgear and controlgear - Part 214: Internal arc classification for AC
metal-enclosed pole-mounted switchgear and controlgear for rated voltages above 1 kV
and up to and including 52 kV (IEC 62271-214:2024)
Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil 214: Störlichtbogenklassifikation
für metallgekapselte, mastmontierte Schaltanlagen für Bemessungsspannungen über 1
kV bis einschließlich 52 kV (IEC 62271-214:2024)
Appareillage à haute tension - Partie 214 : Classification arc interne des appareillages
sous enveloppe métallique à courant alternatif de tensions assignées supérieures à 1 kV
et inférieures ou égales à 52 kV montées sur poteau (IEC 62271-214:2024)
Ta slovenski standard je istoveten z: EN IEC 62271-214:2024
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.

EUROPEAN STANDARD EN IEC 62271-214

NORME EUROPÉENNE
EUROPÄISCHE NORM May 2024
ICS 29.130.10 Supersedes EN IEC 62271-214:2019
English Version
High-voltage switchgear and controlgear - Part 214: Internal arc
classification for AC metal-enclosed pole-mounted switchgear
and controlgear for rated voltages above 1 kV and up to and
including 52 kV
(IEC 62271-214:2024)
Appareillage à haute tension - Partie 214 : Classification arc Hochspannungs-Schaltgeräte und -Schaltanlagen - Teil
interne des appareillages sous enveloppe métallique à 214: Störlichtbogenklassifikation für metallgekapselte,
courant alternatif de tensions assignées supérieures à 1 kV mastmontierte Schaltanlagen für Bemessungsspannungen
et inférieures ou égales à 52 kV montées sur poteau über 1 kV bis einschließlich 52 kV
(IEC 62271-214:2024) (IEC 62271-214:2024)
This European Standard was approved by CENELEC on 2024-05-21. 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,
Türkiye 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
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 62271-214:2024 E

European foreword
The text of document 17C/924/FDIS, future edition 2 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 62271-214:2024.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-02-21
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-05-21
document have to be withdrawn
This document supersedes EN IEC 62271-214:2019 and all of its amendments and corrigenda (if
any).
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.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 62271-214:2024 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 standard indicated:
IEC 62271-200:2021 NOTE Approved as EN IEC 62271-200:2021 (not modified)
IEC/TR 62271-307:2015 NOTE Approved as CLC IEC/TR 62271-307:2019 (not modified)
IEC 60038:2009 NOTE Approved as EN 60038:2011
IEC 60059:1999 NOTE Approved as EN 60059:1999 (not modified)
IEC 60059:1999/A1:2009 NOTE Approved as EN 60059:1999/A1:2009 (not modified)
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.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-151 2001 International Electrotechnical Vocabulary - - -
Part 151: Electrical and magnetic devices
+ AMD1 2013 - -
+ AMD2 2014 - -
+ AMD3 2019 - -
+ AMD4 2020 - -
+ AMD5 2021 - -
IEC 60050-441 1984 International Electrotechnical Vocabulary. - -
Switchgear, controlgear and fuses
+AMD1 2000
IEC 62271-1 2017 High-voltage switchgear and controlgear - EN 62271-1 2017
Part 1: Common specifications for
alternating current switchgear and
controlgear
+ AMD1 2021 + A1 2021
IEC 62271-200 2021 High-voltage switchgear and controlgear - EN IEC 62271-200 2021
Part 200: AC metal-enclosed switchgear and
controlgear for rated voltages above 1 kV
and up to and including 52 kV
IEC 62271-214 ®
Edition 2.0 2024-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
High-voltage switchgear and controlgear –
Part 214: Internal arc classification for AC 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 à courant alternatif de tensions assignées supérieures à 1 kV et
inférieures ou égales à 52 kV montées sur poteau
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.10 ISBN 978-2-8322-8431-5
– 2 – IEC 62271-214:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
3.1 General terms and definitions . 8
3.8 Index of definitions . 10
4 Normal and special service conditions . 11
5 Ratings . 11
5.1 General . 11
5.2 Rated voltage (U ) . 11
r
5.2.1 General . 11
5.3 Rated insulation level (U , U , U ) . 11
d p s
5.4 Rated frequency (f ) . 12
r
5.101 Ratings of the internal arc classification (IAC) . 12
5.101.1 General . 12
5.101.2 Rated approach distance (D ) . 12
AP
5.101.3 Rated arc fault currents (I , I ) . 12
A Ae
5.101.4 Rated arc fault duration (t , t ) . 12
A Ae
6 Design and construction . 12
6.11 Nameplate . 12
6.11.2 Application . 12
6.101 Internal arc fault . 13
6.102 Enclosure . 13
7 Type tests . 14
7.1 General . 14
7.1.1 Basics . 14
7.1.2 Information for identification of test object . 15
7.1.3 Information to be included in type-test reports . 15
7.101 Internal arc type test . 16
7.101.1 General . 16
7.101.2 Test conditions . 16
7.101.3 Arrangement of the equipment . 17
7.101.4 Indicators (for assessing the thermal effects of the gases) . 19
7.101.5 Arrangement of indicators . 19
7.101.6 Test parameters . 20
7.101.7 Test procedure . 21
7.101.8 Criteria to pass the test . 26
7.101.9 Transferability of the test results . 26
8 Routine tests . 27
9 Guide to the selection of switchgear and controlgear (informative) . 27
9.1 General . 27
9.101 Internal arc fault . 27
9.101.1 General . 27
9.101.2 Causes and preventive measures . 28

IEC 62271-214:2024 © IEC 2024 – 3 –
9.101.3 Supplementary protective measures . 28
9.101.4 Considerations for the selection and installation . 29
9.101.5 Internal arc test . 29
9.101.6 IAC designation . 29
10 Information to be given with enquiries, tenders and orders (informative) . 30
10.1 General . 30
11 Transport, storage, installation, operation instruction and maintenance . 30
11.1 General . 30
11.2 Conditions during transport, storage and installation . 31
11.3 Installation . 31
11.3.1 General . 31
11.101 Maintenance . 31
12 Safety . 31
12.1 General . 31
13 Influence of the product on the environment . 31
Annex A (normative) Identification of the test objects . 32
A.1 General . 32
A.2 Data . 32
A.3 Drawings. 32
Bibliography . 33

Figure 1 – Examples of enclosures and compartment(s) in different arrangements . 14
Figure 2 – Test arrangement for pole-mounted switchgear and controlgear . 18
Figure 3 – Horizontal indicator . 19
Figure 4 – Flow-chart for the choice of arc initiation depending on the construction . 24

Table 1 – Nameplate information . 13
Table 2 – Parameters for internal arc fault test according to enclosure and
compartment construction . 23
Table 3 – Locations, causes and examples of measures to decrease the probability of
internal arc faults . 28
Table 4 – Single-phase-to-earth arc fault current depending on the network neutral
earthing . 30

– 4 – IEC 62271-214:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 214: Internal arc classification for AC 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,
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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 62271-214 has been prepared by subcommittee 17C: Assemblies, of IEC technical
committee 17: High voltage switchgear and controlgear. It is an International Standard.
This second edition cancels and replaces the first edition published in 2019. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) indicators positioning update;
b) neutral earthing connection of the test circuit for three-phase tests;
c) general review for consistency with IEC 62271-200, Ed.3.0:2021.

IEC 62271-214:2024 © IEC 2024 – 5 –
The text of this International Standard is based on the following documents:
Draft Report on voting
17C/924/FDIS 17C/931/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.
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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
– 6 – IEC 62271-214:2024 © IEC 2024
INTRODUCTION
IEC 62271-214 has been developed due to the requirement to remove IAC Type C designated
pole-mounted switchgear from IEC 62271-200. 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 and controlgear has been considered within this
document.
This equipment relates to operation in three-phase, two-phase and single-phase systems.

IEC 62271-214:2024 © IEC 2024 – 7 –
HIGH-VOLTAGE SWITCHGEAR AND CONTROLGEAR –

Part 214: Internal arc classification for AC 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 AC metal-
enclosed pole-mounted switchgear and controlgear 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 open terminal
equipment for which an internal arc classification is assigned. Enclosures may include fixed and
removable components and may be filled with fluid (liquid or gas) to provide insulation.
NOTE 1 The IAC classification takes into account the installation disposition of the high-voltage switchgear and
controlgear and worker's operating area.
NOTE 2 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] .
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 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 60050-151:2001, International Electrotechnical Vocabulary (IEV) – Part 151: Electrical
and magnetic devices
IEC 60050-151:2001/AMD1:2013
IEC 60050-151:2001/AMD2:2014
IEC 60050-151:2001/AMD3:2019
IEC 60050-151:2001/AMD4:2020
IEC 60050-151:2001/AMD5:2021
IEC 60050-441:1984, International Electrotechnical Vocabulary (IEV) – Part 441: Switchgear,
controlgear and fuses
IEC 60050-441:1984/AMD1:2000
IEC 62271-1:2017, High-voltage switchgear and controlgear – Part 1: Common specifications
for alternating current switchgear and controlgear
IEC 62271-1:2017/AMD1:2021
___________
Numbers in square brackets refer to the Bibliography.

– 8 – IEC 62271-214:2024 © IEC 2024
IEC 62271-200:2021, High-voltage switchgear and controlgear – Part 200: AC metal-enclosed
switchgear and controlgear for rated voltages above 1 kV and up to and including 52 kV
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62271-1,
IEC 60050-151 and IEC 60050-441, as well as the following apply.
NOTE 1 The classification system for definitions of IEC 62271-1:2017 is not followed. Terms and definitions are
referenced and prioritized in the following order:
– Clause 3 of this document;
– IEC 62271-1:2017;
– IEC 60050-441;
– IEC 60050-151.
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
NOTE 2 Additional definitions are classified so as to be aligned with the classification system used in
IEC 60050-441.
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 – "complete" has been replaced by
"completely assembled"; NOTE has been deleted.]
3.1.102
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, modified – has been deleted.]
3.1.103
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
3.1.104
component
essential part of the high-voltage or earthing circuits of pole-mounted switchgear and
controlgear which serves a specific function (e.g. circuit-breaker, disconnector, switch, fuse,
instrument transformer, bushing, busbar)

IEC 62271-214:2024 © IEC 2024 – 9 –
3.1.105
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".]
3.1.106
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.
3.1.107
normal operating condition
in service condition with all covers properly closed and secured
Note 1 to entry: The term "in service" implies "under live conditions".
[SOURCE: IEC 62271-200:2021[2], 3.1.106, modified – "" and "doors and"
have been removed and Note 1 to entry has been added.]
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[8], modified – Note 1 to entry has been added.]
3.1.111
pole-mounted switchgear and controlgear
metal-enclosed 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
installation out of reach
– 10 – IEC 62271-214:2024 © IEC 2024
3.1.112
internal arc classification
IAC
metal-enclosed switchgear and controlgear for which prescribed criteria, for protection of
authorized persons and the general public beneath the apparatus, are met in the event of
internal arc for specified installation conditions, as demonstrated by type tests
Note 1 to entry: The internal arc classification is described by the characteristics given from 3.1.114 to 3.1.116.
[SOURCE: IEC 62271-200:2021, 3.6.117, modified – "authorized" and "and general public
beneath the apparatus" have been added, "assembly" has been changed by "metal-enclosed
switchgear and controlgear".]
3.1.113
arc fault current
three-phase and where applicable the single-phase-to-earth RMS value of the internal arc fault
current for which the switchgear and controlgear is designed to protect persons in the event of
an internal arc
[SOURCE: IEC 62271-200:2021, 3.7.101]
3.1.114
arc fault duration
duration of the internal arc fault current for which the switchgear and controlgear is designed to
protect persons in the event of an internal arc
[SOURCE: IEC 62271-200:2021, 3.7.102]
3.1.115
approach distance
distance between the test object and indicators arranged in an IAC test
3.1.116
arc mitigation device
device dedicated to reacting to internal arc fault conditions to decrease the arc energy
[SOURCE: CIGRE TECHNICAL BROCHURE 686:2017][5]
3.8 Index of definitions
A – C
approach distance . 3.1.115
arc fault current . 3.1.113
arc fault duration . 3.1.114
arc mitigation device . 3.1.116
component . 3.1.104
E – F
earthing circuit . 3.1.106
enclosure . 3.1.102
fluid-filled compartment . 3.1.109

IEC 62271-214:2024 © IEC 2024 – 11 –
H – I
high-voltage compartment . 3.1.103
internal arc classification, IAC . 3.1.112
M – N
main circuit . 3.1.105
metal-enclosed switchgear and controlgear . 3.1.101
normal operating condition . 3.1.107
P
pole . 3.1.110
pole-mounted switchgear and controlgear . 3.1.111
pressure relief device . 3.1.108
4 Normal and special service conditions
Clause 4 of IEC 62271-1:2017 and IEC 62271-1:2017/AMD1:2021 is not applicable.
5 Ratings
Subclauses of Clause 5 of IEC 62271-1:2017 and IEC 62271-1:2017/AMD1:2021 not mentioned
below are not applicable for this document.
5.1 General
Subclause 5.1 of IEC 62271-1:2017 and IEC 62271-1:2017/AMD1:2021 is not applicable and
replaced by following text:
The relevant ratings for the internal arc classification are the following:
a) rated voltage (U );
r
b) rated frequency (f );
r
c) ratings of the internal arc classification (IAC).
5.2 Rated voltage (U )
r
Subclause 5.2 of IEC 62271-1:2017 is applicable with following addition to 5.2.1.
5.2.1 General
The rated voltage is equal to the maximum system voltage for which the equipment is designed.
It indicates the maximum value of the "highest system voltage" of networks for which the
equipment may be used (refer to Clause 9 of IEC 60038:2009 [6]).
NOTE It is possible that components forming part of pole-mounted switchgear and controlgear have differing values
of rated voltage in accordance with their relevant standards.
5.3 Rated insulation level (U , U , U )
d p s
Not applicable.
– 12 – IEC 62271-214:2024 © IEC 2024
5.4 Rated frequency (f )
r
Subclause 5.4 of IEC 62271-1:2017 and IEC 62271-1:2017/AMD1:2021 is applicable.
5.101 Ratings of the internal arc classification (IAC)
5.101.1 General
An IAC classified pole-mounted switchgear and controlgear shall have the following ratings:
rated approach distance, arc fault currents and arc fault durations.
5.101.2 Rated approach distance (D )
AP
The rated approach distance shall be stated by the manufacturer (refer to Figure 2).
5.101.3 Rated arc fault currents (I , I )
A Ae
The value of rated arc fault currents should be selected from the R 10 series specified in
IEC 60059 [7].
Two ratings of the arc fault currents are recognised:
a) three-phase and phase-to-phase arc fault current (I ), when applicable;
A
b) single-phase-to-earth arc fault current (I ), when applicable.
Ae
When only a three-phase rating is specified, the single-phase rating is by default 87 % of the
three-phase rating, and need not be specified.
NOTE 1 The rationale for this 87 % is the arc fault test with 2-phase ignition; refer to 7.101.7.2.
The manufacturer shall specify the compartments to which the single-phase-to-earth arc fault
current rating applies. Such value is assigned to switchgear and controlgear where its
construction will prevent the arc from becoming multiphase, as demonstrated during the internal
arc test.
In the case where all high-voltage compartments are only designed for single-phase-to-earth
arc faults, instead of I rating, the I rating shall be assigned (refer to 7.101.7.2).
A Ae
NOTE 2 Information about the relationship between type of neutral earthing and the single-phase-to-earth arc fault
current is provided in 9.101.6.
5.101.4 Rated arc fault duration (t , t )
A Ae
Recommended values for the arc fault duration (t , t ) are 0,1 s, 0,5 s and 1 s.
A Ae
NOTE It is in general not possible to calculate the permissible arc duration for a current which differs from that used
in the test.
6 Design and construction
Subclauses of Clause 6 of IEC 62271-1:2017 and IEC 62271-1:2017/AMD1:2021 not mentioned
below are not applicable for this document.
6.11 Nameplate
6.11.2 Application
Subclause 6.11.2 of IEC 62271-1:2017 and IEC 62271-1:2017/AMD1:2021 is applicable, except
for Table 9, with the following additions:

IEC 62271-214:2024 © IEC 2024 – 13 –
Pole-mounted switchgear and controlgear, with a rated internal arc classification shall include
in the nameplate the additional IAC information in accordance with Table 1.
Table 1 – Nameplate information
Abbreviation Unit ** Condition:
Marking only required if
(1) (2) (3) (4) (5)
Internal arc classification IAC X
Rated approach distance D m X
AP
Arc fault current and duration I , t kA, s Y Three-phase test or
A A
phase-to-phase test are
applicable
Single-phase-to-earth arc fault current I , t kA, s Y A single-phase test is
Ae Ae
and duration applicable or I differs
Ae
from 87 % of I
A
Fitted with arc mitigation device  Y Arc mitigation device
fitted and not disabled
during testing
(**)
X : the marking of these values is mandatory
Y : conditions for marking of these values are given in column (5)
NOTE If there is an abbreviation in column (2) it can be used instead of the terms in column (1).

6.101 Internal arc fault
Pole-mounted switchgear and controlgear, in principle, are designed and manufactured, to
prevent the occurrence of internal arc faults.
However, the switchgear and controlgear shall be designed to give a defined level of protection
of persons in the event of an internal arc, when the switchgear and controlgear is in normal
operating condition.
The designation shall be included in the nameplate (refer to 6.11).
Some examples for internal arc classification are given in 7.101.7.2.5.
6.102 Enclosure
The enclosure is designed for withstanding the mechanical, electrical, thermal and
environmental stresses likely to be encountered in normal operating condition and under
conditions of internal arc fault.
Figure 1 shows examples of different arrangements of components in high voltage
compartment(s) within an enclosure.

– 14 – IEC 62271-214:2024 © IEC 2024

a) three-phase
b) single-phase
Figure 1 – Examples of enclosures and compartment(s) in different arrangements
7 Type tests
Subclauses of Clause 7 of IEC 62271-1:2017 and IEC 62271-1:2017/AMD1:2021 not mentioned
below are not applicable for this document.
7.1 General
7.1.1 Basics
The type test is performed to verify the internal arc ratings and characteristics of pole-mounted
switchgear and controlgear.
IEC 62271-214:2024 © IEC 2024 – 15 –
7.1.2 Information for identification of test object
Subclause 7.1.2 of IEC 62271-1:2017 does not apply for this document and is replaced by
following text.
The manufacturer shall submit to the testing laboratory, drawings and other data containing
sufficient information to unambiguously identify by type the essential details and parts of the
switchgear and controlgear presented for test. A summary list of the drawings and data
schedules shall be supplied by the manufacturer and shall be uniquely referenced and shall
contain a statement to the effect that the manufacturer guarantees that the drawings or data
schedules listed are the correct version and truly represent the switchgear and controlgear to
be tested.
The testing laboratory shall check that drawings and data sheets adequately represent the
essential details and parts of the test object, but is not responsible for the accuracy of the
detailed information.
Particular drawings or data required to be submitted by the manufacturer to the test laboratory
for identification of essential parts of test object are specified in Annex A.
7.1.3 Information to be included in type-test reports
The results shall be recorded in type-test reports containing sufficient data to prove compliance
with the test clauses of this document for the test(s) conducted. Sufficient information shall be
included so that the essential parts of the test object can be identified. In particular, the following
information shall be included:
– manufacturer;
– type designation and unique identifier for the test object;
– rated characteristics of the test object;
– photographs to illustrate the condition of the test object before and after test;
– sufficient outline drawings and data schedules to represent the test object;
– the reference numbers of all drawings including revision number submitted to identify the
essential parts of the test object;
– details of the testing arrangement (including diagram of test circuit);
– statements of the behaviour of the test object during test and its condition after test;
– description of the test object with a drawing showing the main dimensions, details relevant
to the mechanical strength, the arrangement of the pressure relief device(s) and the method
of fixing the test object to the pole(s), including the pole characteristics;
– point and method of initiation of the internal arc fault;
– drawings of test arrangement (test object, source side connection point, and mounting frame
of indicators, pole dimensions) and any other relevant installation conditions; applied
voltage and frequency;
• IAC designation validated by test;
• include use of fuse protection if used;
• include the use of arc mitigation device if used;
– for the prospective and/or test current
...