SIST EN IEC 61439-5:2023

SLOVENSKI STANDARD
01-november-2023
Sestavi nizkonapetostnih stikalnih in krmilnih naprav - 5. del: Sestavi za
distribucijo električne energije v javnih omrežjih (IEC 61439-5:2023)
Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power
distribution in public networks (IEC 61439-5:2023)
Niederspannungs-Schaltgerätekombinationen - Teil 5: Schaltgerätekombinationen in
öffentlichen Energieverteilungsnetzen (IEC 61439-5:2023)
Ensembles d'appareillage à basse tension - Partie 5: Ensembles pour réseaux de
distribution publique (IEC 61439-5:2023)
Ta slovenski standard je istoveten z: EN IEC 61439-5:2023
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
29.240.99 Druga oprema v zvezi z Other equipment related to
omrežji za prenos in power transmission and
distribucijo električne energije distribution networks
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 61439-5

NORME EUROPÉENNE
EUROPÄISCHE NORM September 2023
ICS 29.130.20 Supersedes EN 61439-5:2015;
EN 61439-5:2015/AC:2015
English Version
Low-voltage switchgear and controlgear assemblies - Part 5:
Assemblies for power distribution in public networks
(IEC 61439-5:2023)
Ensembles d'appareillage à basse tension - Partie 5: Niederspannungs-Schaltgerätekombinationen - Teil 5:
Ensembles pour réseaux de distribution publique Schaltgerätekombinationen in öffentlichen
(IEC 61439-5:2023) Energieverteilungsnetzen
(IEC 61439-5:2023)
This European Standard was approved by CENELEC on 2023-09-06. 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
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 61439-5:2023 E

European foreword
The text of document 121B/173/FDIS, future edition 3 of IEC 61439-5, prepared by SC 121B "Low-
voltage switchgear and controlgear assemblies" of IEC/TC 121 "Switchgear and controlgear and their
assemblies for low voltage" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 61439-5:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2024-06-06
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-09-06
document have to be withdrawn
This document supersedes EN 61439-5:2015 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.
This document has been prepared under a Standardization Request addressed to CENELEC by the
European Commission.
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 61439-5:2023 was approved by CENELEC as a European
Standard without any modification.
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.
The Annex ZA of EN IEC 61439-1:2021 applies with the following changes:
Publication Year Title EN/HD Year

Add the following references:
IEC 60695-11-10 2013 Fire hazard testing - Part 11-10: Test EN 60695-11-10 2013
flames - 50 W horizontal and vertical flame
test methods
IEC 61439-1 2020 Low-voltage switchgear and controlgear EN IEC 61439-1 2021
assemblies - Part 1: General rules
IEC 62262 - Degrees of protection provided by EN 62262 -
enclosures for electrical equipment against
external mechanical impacts (IK code)
ISO 6506-1 2014 Metallic materials - Brinell hardness test - EN ISO 6506-1 2014
Part 1: Test method
ISO 9223 2012 Corrosion of metals and alloys - Corrosivity EN ISO 9223 2012
of atmospheres - Classification,
determination and estimation
IEC 61439-5 ®
Edition 3.0 2023-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Low-voltage switchgear and controlgear assemblies –

Part 5: Assemblies for power distribution in public networks

Ensembles d'appareillage à basse tension –

Partie 5: Ensembles pour réseaux de distribution publique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.130.20  ISBN 978-2-8322-6939-8

– 2 – IEC 61439-5:2023 © IEC 2023
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols and abbreviations . 8
5 Interface characteristics. 8
6 Information . 8
7 Service conditions . 9
8 Constructional requirements . 10
9 Performance requirements. 12
10 Design verification . 12
11 Routine verification . 27
Annexes . 28
Annex L (informative) Guidance on verification of temperature rise . 29
Annex AA (normative) Cross-section of conductors . 30
Annex BB (informative) Items subject to agreement between the assembly
manufacturer and the user . 32
Annex CC (informative) Design verification . 36
Annex DD (informative) List of notes concerning certain countries . 37
Bibliography . 38

Figure 101 – Typical distribution network . 6
Figure 102 – Diagram of test to verify resistance to shock load of a PENDA-O . 15
Figure 103 – Diagram of test to verify impact force withstand of a PENDA-O . 16
Figure 104 – Diagram of test to verify the resistance to static load . 17
Figure 105 – Sandbag for test to verify the resistance to shock load . 18
Figure 106 – Diagram of test to verify resistance to torsional stress of a PENDA-O . 20
Figure 107 – Diagram of test to verify the mechanical strength of doors . 23
Figure 108 – Striker element for test of resistance to mechanical shock impacts
induced by sharp-edged objects . 24
Figure 109 – Typical test arrangement for mechanical strength of base . 25

Table 101 – Values of assumed loading . 8
Table 102 – Axial load to be applied to the inserts . 24
Table AA.1 – Minimum and maximum cross-section of copper and aluminium
conductors, suitable for connection (see 8.8) . 30
Table AA.2 – Standard cross-sections of round copper conductors and approximate
relationship between mm and AWG/kcmil sizes (see 8.8 of IEC 61439‑1:2020) . 31
Table BB.1 – Items subject to agreement between the ASSEMBLY manufacturer
and the user . 32
Table CC.1 – List of design verifications to be performed. 36

IEC 61439-5:2023 © IEC 2023 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –

Part 5: Assemblies for power distribution in public networks

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.
IEC 61439-5 has been prepared by subcommittee 121B: Low-voltage switchgear and
controlgear assemblies, of IEC technical committee 121: Switchgear and controlgear and their
assemblies for low voltage. It is an International Standard.
This third edition cancels and replaces the second edition published in 2014. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) omission of the requirement to conduct mechanical tests at -25 °C when enclosures are
made of a metallic material;
b) addition of assumed loading factors generation supplies and electric vehicle charging
applications;
c) additional dielectric tests when a PENDA is used in a distribution substation with separate
HV and LV earths;
d) further clarification of representative samples for design verification.

– 4 – IEC 61439-5:2023 © IEC 2023
The text of this International Standard is based on the following documents:
Draft Report on voting
121B/173/FDIS 121B/178/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 document is to be read in conjunction with IEC 61439-1. The provisions of the general
rules dealt with in IEC 61439-1 are only applicable to this document insofar as they are
specifically cited. When this document states "addition", "modification" or "replacement", the
relevant text in IEC 61439-1:2020 is to be adapted accordingly. Subclauses that are numbered
with a 101 (102, 103 etc.) suffix are additional to the same subclause in IEC 61439‑1:2020.
Tables and figures in IEC 61439-5:2023 that are new are numbered starting with 101.
New annexes in IEC 61439-5:2023 are lettered AA, BB, etc.
The reader’s attention is drawn to the fact that Annex DD lists all of the "in-some-country"
clauses on differing practices of a less permanent nature relating to the subject of this
document.
A list of all parts of the IEC 61439 series, under the general title Low-voltage switchgear and
controlgear assemblies 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,
• replaced by a revised edition, or
• amended.
IEC 61439-5:2023 © IEC 2023 – 5 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –

Part 5: Assemblies for power distribution in public networks

1 Scope
This document defines the specific requirements for public electricity network distribution
assemblies (PENDAs).
PENDAs have the following criteria:
– used for the distribution of electrical energy in three phase systems for which the rated
voltage does not exceed 1 000 V AC (see Figure 101 for a typical distribution network) and
DC systems not exceeding 1 500 V DC;
– stationary;
– open type assemblies are not covered by this document;
– suitable for installation in places where only skilled persons have access for their use,
however, outdoor types can be installed in situations that are accessible to ordinary persons
• intended for use in energy distribution in public power grids;
• indoor use: assemblies for installation inside of electric power substations;
• outdoor use: assemblies containing an enclosure suitable for open air installation.
The object of this document is to state the definitions and to specify the service conditions,
construction requirements, technical characteristics and tests for PENDAs. Tests at higher
performance level can be applicable with some network parameters.
PENDAs can also include control and or signalling devices associated with the distribution of
electrical energy.
NOTE 1 Control and monitoring devices can be used in smart grid applications or the transmission of smart grid
data.
This document applies to all PENDAs whether they are designed, manufactured on a one-off
basis or fully standardised and manufactured in quantity.
The manufacture and/or assembly can be carried out other than by the original manufacturer
(see 3.10.1 of IEC 61439-1:2020).
This document does not apply to individual devices and self-contained components, such as
motor starters, fuse switches, electronic equipment, etc. which comply with the relevant product
standards.
If the substation is owned or operated by a public distribution system operator (DSO), PENDA’s
which are used as LV distribution panels in transformer substations are within the scope of this
document,
This document does not apply to specific types of assemblies covered by other parts of
IEC 61439 series.
– 6 – IEC 61439-5:2023 © IEC 2023

Figure 101 – Typical distribution network
NOTE 2 If a PENDA is equipped with additional equipment (for example meters), in such a way that the main
function is changed considerably, then other standards can also apply as agreed between user and manufacturer
(see 8.5 of IEC 61439-1:2020).
NOTE 3 Where local regulations and practices permit, a PENDA according to this document can be used in other
than public networks.
NOTE 4 DSO’s can define additional requirements for their PENDA’s.
2 Normative references
This clause of IEC 61439-1:2020 applies except as follows.
Addition:
IEC 60695-11-10:2013, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
IEC 61439-1:2020, Low-voltage switchgear and controlgear assemblies – Part 1: General rules
IEC 62262, Degrees of protection provided by enclosures for electrical equipment against
external mechanical impacts (IK code)
ISO 9223:2012, Corrosion of metals and alloys – Corrosivity of atmospheres – Classification,
determination and estimation
ISO 6506-1:2014, Metallic materials – Brinell hardness test – Part 1: Test method

IEC 61439-5:2023 © IEC 2023 – 7 –
3 Terms and definitions
This clause of IEC 61439-1:2020 applies except as follows.
3.1 General terms
Additional terms:
3.1.101
public electricity network distribution assembly
PENDA
assembly, generally for installation in a public electricity network which in use, receives
electrical energy from one or more supplies and distributes that energy through one or more
cables to other equipment
Note 1 to entry: A PENDA is installed, operated and maintained solely by skilled persons.
Note 2 to entry: Some types of a PENDA were previously known as a cable distribution cabinet (CDC).
3.1.101.1
outdoor public electricity network distribution assembly
PENDA-O
cubicle type public electricity network distribution assembly that is suitable for outdoor
installation in places that can, or cannot, be accessible to the public
3.1.101.2
indoor public electricity network distribution assembly
PENDA-I
public electricity network distribution assembly suitable for installation indoors, generally
without an enclosure, but including all structural parts necessary to support busbars, functional
units and other ancillary devices, necessary to complete the assembly
3.1.102
design life
minimum duration for which specified performance characteristics of equipment are expected
when the equipment is operated as intended and regularly maintained by instructed persons in
accordance with the manufacturer’s instructions
[SOURCE: IEC 60050-395:2014, 395-07-93, modified – Note to entry omitted and 'granted'
replaced by 'expected when . instructions'.]
3.3 External design of assemblies
3.3.1
open-type assembly
This term of IEC 61439-1:2020 does not apply.
3.9 Verification
Modifications:
3.9.1
design verification
Delete the note.
3.9.1.2
verification comparison
This term of IEC 61439-1:2020 does not apply.

– 8 – IEC 61439-5:2023 © IEC 2023
3.9.1.3
verification assessment
This term of IEC 61439-1:2020 does not apply.
4 Symbols and abbreviations
This clause of IEC 61439-1:2020 applies.
5 Interface characteristics
This clause of IEC 61439-1:2020 applies, except as follows.
5.4 Rated diversity factor (RDF)
Addition:
In the absence of an agreement between the assembly manufacturer and user concerning the
actual load currents, the assumed loading of the outgoing circuits of the assembly or group of
outgoing circuits can be based on the values given in Table 101.
For distribution and final circuits, it is assumed that the load current is the rated current of the
protective device, I , as required by the user, multiplied with the loading factor of Table 101.
n
Table 101 – Values of assumed loading
Application Assumed
loading
factor
Regular distribution grid connections 0,9
2 to 3 circuits
Regular distribution grid connections 0,8
4 to 5 circuits
Regular distribution grid connections 0,7
6 to 9 circuits
Regular distribution grid connections 0,6
≥ 10 circuits
Generation supply (e,g. PV, wind farm, biomass) 1,0
Charging infrastructure for EV 1,0

6 Information
This clause of IEC 61439-1:2020 applies except as follows.
6.1 Assembly designation marking
Addition to first paragraph:
Designation plates can be placed inside an enclosure of an assembly provided their intended
place ensures good legibility and visibility when the door(s) is(are) open or the cover is
removed.
IEC 61439-5:2023 © IEC 2023 – 9 –
Replacement of item g):
g) IEC 61439-5.
6.3 Device and/or component identification
Additional paragraph:
In the case of removable fuse-carriers which are specific to a fuseway, a label shall be placed
on the fuse carrier as well as on the fuse base, to avoid incorrect interchangeability of the
fuse-carrier.
Additional subclause:
6.101 Circuit identification
It shall be possible to identify each functional unit in a clearly visible manner.
7 Service conditions
This clause of IEC 61439-1:2020 applies except as follows.
7.1 Normal service conditions
7.1.1 Climatic conditions
Addition to the first paragraph:
Unless the user specifies that a PENDA shall be suitable for use in an arctic climate, the lower
limit of ambient air temperature is –25 °C as specified in Table 15 of IEC 61439-1:2020. For an
arctic climate the lower limit of ambient temperature is –50 °C.
7.1.2 Pollution degree
Replace the first paragraph with the following:
The pollution degree referred to in Annex BB is the macro-environmental condition for which
the assembly is intended.
7.2 Special service conditions
Additional paragraph:
Additional requirements for a PENDA-O, to be installed where heavy snowfalls occur and where
they are adjacent to areas where there is snow clearance by ploughing, are subject to
agreement between manufacturer and user.

– 10 – IEC 61439-5:2023 © IEC 2023
8 Constructional requirements
This clause of IEC 61439-1:2020 applies except as follows.
8.1 Strength of materials and parts
8.1.1 General
Change the reference to Annex C to Annex BB in paragraph 5 of 8.1.1 of IEC 61439-1:2020.
Addition:
A PENDA-O shall be arranged for ground mounting, transformer mounting, pole mounting,
surface wall mounting or mounting within a recess within a wall, as agreed between user and
manufacturer.
A PENDA can be directly coupled to a transformer by means of a flange coupling or it can
connect to its supply by means of cable or via busbars as agreed between user and
manufacturer. Outgoing circuits shall be suitable for connection by means of cables.
A locking device shall be provided on outdoor enclosures which prevents access by
unauthorized persons. The fixings of any covers etc. which are removable for installation or
maintenance operations shall only be accessible while the door(s) is (are) open.
Any auxiliary equipment, e.g. meters, relays, instruments, circuit breaker trip units,
communications equipment, that can be readily replaced, are excluded from the minimum
design life of a PENDA.
NOTE When applicable, a design life can be agreed between user and manufacturer, assuming it is operated as
intended and regularly maintained by instructed personnel in accordance with the manufacturer’s instructions.
8.1.3.2 Resistance of insulating materials to heat and fire
Additional subclause:
8.1.3.2.101 Verification of category of flammability
The insulating materials used for enclosures, barriers and other insulating parts shall have
flammability properties in accordance with 10.2.3.101.
8.1.5 Mechanical strength
Additional subclause:
8.1.5.101 Verification of mechanical strength
The mechanical properties of a PENDA-O shall comply with 10.2.101.
Parts of the PENDA-O intended to be embedded in the ground shall withstand the stresses
imposed on them during installation and normal service and comply with 10.2.101.9.
8.2 Degree of protection provided by an assembly enclosure
8.2.1 Protection against mechanical impact (IK code)
Subclause 8.2.1 of IEC 61439-1:2020 does not apply.
The mechanical impact tests required by this document are at least equal to IK10 in accordance
with IEC 62262 (see 8.1.5.101).

IEC 61439-5:2023 © IEC 2023 – 11 –
8.2.2 Protection against contact with live parts, ingress of solid foreign bodies and
water (IP code)
Addition:
Open type assemblies (IP00) are not covered by this document.
When a PENDA-O is intended to be installed in places accessible to the public, its enclosure
shall, when fully-installed in accordance with the manufacturer’s instructions, provide a degree
of protection of at least IP34D according to IEC 60529. In other locations, the minimum level of
protection shall be at least IP33.
PENDA-O’s that are intended to be installed in places accessible to the public shall, unless
otherwise stated by the user, be designed such that when any temporary cables are connected,
the enclosure shall provide a degree of protection of at least IP23C according to IEC 60529.
See 8.8.
8.4.2.1 General
The third paragraph does not apply.
Additional subclause:
8.4.2.101 Earthing and short-circuiting means
When specified by the user, the outgoing units in an assembly shall be so constructed that they
can be earthed and short-circuited in a secure manner by means of a device(s) recommended
by the manufacturer, which ensures the required degree of protection (IP code) is maintained
for all parts of the assembly.
8.4.3.1 Installation conditions
Additional paragraph:
When a user specifies the assembly is to feed overhead cable lines, outgoing units shall be
designed in such a way that an attached cable(s) can be earthed at the termination(s).
8.8 Terminals for external cables
Replacement of the first three paragraphs with the following:
In the absence of a special agreement between user and manufacturer, terminals shall be
capable of accommodating cables having copper or aluminium conductors from the smallest to
the largest cross-sectional area corresponding to the appropriate rated current (see
Table AA.1).
The terminations for outgoing circuits shall be located so that adequate spacing is provided and
to facilitate terminating the phase conductors of a cable irrespective of their lay.
When specified by the user the phase cable terminals of each outgoing circuit shall be
separated from all other hazardous live parts. When the terminals of an outgoing circuit are
exposed protection shall be provided against accidental contact with other hazardous live parts.
Separation and protection shall be from the normal direction of access and in accordance with
IPXXB of IEC 60529.
Where specified by the user, the incoming circuit shall be suitable for connection by means of
either bare or insulated bars.

– 12 – IEC 61439-5:2023 © IEC 2023
Additional subclauses:
8.101 Marking as an obstacle to snow clearance
When specified by the user, a PENDA-O that is intended for use in regions where heavy
snowfalls occur in accordance with 7.2, shall be marked as an obstacle to snow clearance.
Holders shall be provided, attached to the PENDA-O, to accommodate marking rods and it shall
be possible to install and make adjustments to the position of the marking rod from outside the
PENDA-O.
8.102 Ease of operation and maintenance
All parts of the assembly shall, as far as practicable, be readily accessible and replaceable
without excessive dismantling.
The design shall be such that the cables can be readily connected from the front.
When a PENDA does not have a means of measurement incorporated, it shall be possible, by
the use of a portable instrument, to readily and safely measure voltages in all phases of
incoming units and on both sides of all current breaking and/or switch devices of outgoing units,
also the current in one phase of all outgoing units. During this operation all live parts of the
PENDA shall be protected sufficiently to retain the required degree of protection in accordance
with 8.2. Instructions concerning the procedure to be adopted shall be provided by the
manufacturer.
If the assembly is intended to be connected to a live reserve power, for example a standby
generator, the switchgear connecting device shall be designed so that connection can be made
with the live parts having a degree of protection of IPXXB according to IEC 60529.
9 Performance requirements
This clause of IEC 61439-1:2020 applies.
10 Design verification
This clause of IEC 61439-1:2020 applies except as follows.
10.1 General
th th th
Replace 6 , 7 , and 8 paragraph with:
Design verification shall only be achieved by the application of tests in accordance with
Clause 10. The alternatives methods of verification by assessment or comparison with a
reference design shall not be used (see Table CC.1).
It is not necessary to test every arrangement produced. Tests carried out on a representative
sample of the most onerous PENDA are deemed to verify the performance of similar and less
onerous assemblies of the same general construction and rating. Examples of tests carried out
on most onerous representative sample include:
1) A temperature rise test carried out on 800 A PENDA with 5 outgoing circuits is deemed to
apply to an 800 A PENDA of the same construction (same general enclosure, same design
of busbars and same incoming unit(s)) with 8 outgoing circuits of the same design.
2) Mechanical strength tests carried out on the smallest and largest enclosure in a series are
deemed to apply to all other enclosures in the series, when they have the same number of
doors and when they are of the same general construction.

IEC 61439-5:2023 © IEC 2023 – 13 –
3) Providing the busbar and connection support arrangements are the same, short-circuit tests
carried out on a design of busbar and connections are deemed to apply to higher current
ratings of busbars and connections.
4) A short circuit test carried out on 800 A PENDA with 8 outgoing circuits is deemed to apply
to an 800 A PENDA of the same construction (same general enclosure, same design of
busbars and same incoming unit(s)) with 5 outgoing circuits of the same design.
5) For a given short circuit rating, a short circuit tests carried out on an incoming or outgoing
circuit is deemed to apply to higher current rating circuits of the same design and
construction
Additional last paragraph:
Where necessary to suit their particular network parameters, users can specify more onerous
or additional test requirements.
10.2 Strength of materials and parts
10.2.2 Resistance to corrosion
10.2.2.1 Verification by test
Replacement of last paragraph with the following:
When the corrosion resistance properties and projected life, as agreed between the
manufacturer and the user, shall be confirmed by reference to ISO 9223:2012, the tests detailed
herein need not be performed.
In all other cases the corrosion resistance of each design of assembly shall be verified by
severity test A or B, as applicable and as detailed 10.2.2.3 of IEC 61439-1:2020 and 10.2.2.2.
10.2.2.2 Severity test A
Replacement of the test specification (paragraph 2) with the following:
Damp heat cycling test of IEC 60068-2-30:2005: Severity – temperature 55 °C, 6 cycles and
variant 1.
At the end of the test, the specimens are removed from the test chamber.
Compliance is checked by visual inspection. The parts tested shall not show rust, cracking or
other deterioration. However, surface corrosion of the protective coating is allowed.
10.2.2.4 Results to be obtained
This subclause of IEC 61439-1:2020 is not applicable in respect of tests carried out in
accordance with 10.2.2.2.
10.2.3 Properties of insulating materials
Additional subclause:
10.2.3.101 Verification of category of flammability
Representative specimens of each of the materials of enclosures, barriers and other insulating
parts shall be subjected to a flammability test in accordance with test method A – horizontal
burning test of IEC 60695-11-10:2013.

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Compliance is checked by inspection that each set of specimens can be classified to category
HB40 criteria a) or b) in accordance with 8.4.3 of IEC 60695-11-10:2013.
10.2.6 Verification of protection against mechanical impact (IK code)
This subclause of IEC 61439-1:2020 is not applicable to assemblies complying with this
document.
Additional subclauses:
10.2.101 Verification of mechanical strength
10.2.101.1 General
Where enclosures are manufactured in a series and are of the same design and construction,
only the smallest and largest size of enclosure shall be tested.
The tests shall be carried out at an ambient temperature between 10 °C and 40 °C.
With the exception of the test of 10.2.101.7, a new sample assembly can be used for each of
the independent tests. If the same sample assembly is used for more than one test of 10.2.101,
the compliance check for the second numeral of the degree of protection (IP code) need only
be applied when the tests on that sample have been completed.
All tests shall be carried out with the assembly fixed at its normal service mounting and where
appropriate, added support at normal ground level as indicated in Figure 102a, Figure 102b,
Figure 103a, and Figure 103b.
IEC 61439-5:2023 © IEC 2023 – 15 –
Dimensions in millimetres
Figure 102a – Diagram of test to verify the resistance to shock load
of a ground mounted PENDA-O with embedded base
Dimensions in millimetres
Figure 102b – Diagram of test to verify resistance to shock load
of a ground mounted PENDA-O without embedded base
Figure 102 – Diagram of test to verify resistance to shock load of a PENDA-O

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Dimensions in millimetres
Figure 103a – Diagram of test to verify impact force withstand
for a ground mounted PENDA-O with embedded base
Dimensions in millimetres
Figure 103b – Diagram of test to verify impact force withstand
for a ground mounted PENDA-O without embedded base
Figure 103 – Diagram of test to verify impact force withstand of a PENDA-O
With the exception of the test of 10.2.101.8, the door(s) of the assembly, if applicable, shall be
locked at the commencement of the test and remain locked for the duration of the test.
10.2.101.2 Verification of resistance to static load
The following tests shall be carried out on all types of PENDA-0:
Test 1 – An evenly distributed load of 8 500 N/m shall be applied for 5 min to the roof of the
enclosure (see Figure 104).
IEC 61439-5:2023 © IEC 2023 – 17 –
Test 2 – A force of 1 200 N shall be applied for 5 min in turn to the front and back upper edges
of the roof of the enclosure (see Figure 104).

Figure 104 – Diagram of test to verify the resistance to static load
Compliance is checked by verification after the test that the minimum degree of protection is in
accordance with 8.2.2, and the operation of the door(s) and locking points are not impaired;
also by verification that the electrical clearances have remained satisfactory for the duration of
the tests and in the case of an assembly having metallic enclosure, that no contact between
live parts and the enclosure has occurred caused by permanent or temporary distortion.
10.2.101.3 Verification of resistance to shock load
The test shall apply to all types of PENDA-O.
A bag in accordance with Figure 105 containing dry sand and having a total mass of 15 kg shall
be hung from an overhead support vertically above the surface under test and at 1 m above the
strike point of the assembly.
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Dimensions in millimetres
Figure 105 – Sandbag for test to verify the resistance to shock load
Each test shall consist of one blow aimed at the upper part of each of the vertical surfaces of
the assembly which are visible when the assembly is installed in its normal service position.
Separate enclosures can be used for each of the test blows.
In the case of an enclosure of cylindrical form, the test shall consist of three blows which are
positioned with an angular displacement of 120°.
A test shall consist of raising the lifting eye through a height of 1 m and allowing the sandbag
to fall through a vertical arc to impact the approximate centre of the upper part of the surface
of the assembly under test (see Figure 102a and Figure 102b).
Compliance is checked by verification after the test that the degree of protection remains in
accordance with 8.2.2, and the operation of the door(s) and locking points are not impaired;
also by verification that the electrical clearances have remained satisfactory for the duration of
the tests and, in the case of an assembly having a metallic enclosure, that no contact between
live parts and the enclosure has occurred caused by permanent or temporary distortion. In the
case of an assembly having an insulating enclosure, if the appropriate conditions are satisfied,
then damage such as small dents or small degrees of surface cracking or flaking are
disregarded, provided that there are no associated cracks detrimental to the serviceability of
the assembly.
IEC 61439-5:2023 © IEC 2023 – 19 –
10.2.101.4 Verification of resistance to torsional stress
The test only applies to all types of PENDA-O.
The test is carried out using a horizontally rotatable frame constructed from
60 mm × 60 mm × 5 mm angle iron, having vertical locations 100 mm long at the frame arm’s
extremities. The assembly under test is rigidly fixed at its base and the frame closely fitted over
it, so that the end locations of the frame arm are in contact with the roof and walls of the
assembly.
The assembly, with the door(s) closed shall have a torsional force applied for 30 s as shown in
Figure 106a and Figure 106b. This is comprised two separate tests, first with the two forces
each of 1 000 N applied to twist the PENDA in a clockwise direction and the second with the
two forces each of 1 000 N applied to rotate the PENDA in an anti-clockwise direction.

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Dimensions in millimetres
Figure 106a – Diagram of test to verify the resistance to torsional stress
of a ground mounted PENDA-O with embedded base
Dimensions in millimetres
Figure 106b – Diagram of test to verify resistance to torsional stress
of a ground mounted PENDA-O without embedded base
Figure 106 – Diagram of test to verify resistance to torsional stress of a PENDA-O
Compliance is checked by verifying tha
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