Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power distribution in public networks

IEC 61439-5:2014 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 a.c. (see Figure 101 for a typical distribution network);
- open ASSEMBLIES are not covered by this standard;
- suitable for installation in places where only skilled persons have access for their use, however, outdoor types may be installed in situations that are accessible to ordinary persons;
- for indoor or outdoor use.
This second edition cancels and replaces the first edition published in 2010. It constitutes a technical revision. This edition includes the following significant technical changes with respect to the latest edition:
- confirmation that tests carried out on the most onerous PENDA are deemed to verify the performance of similar and less onerous assemblies of the same general construction and rating;
- more precise timing/conditions for impact force withstand tests for PENDAs designed for operation in an arctic climate;
- correction of the direction of the applied force in the static load test.
This publication is to be read in conjunction with IE 61439-1:2011. The contents of the corrigendum of March 2015 have been included in this copy.

Ensembles d'appareillage à basse tension - Partie 5: Ensembles pour réseaux de distribution publique

L'IEC 61439-5:2014 définit les exigences spécifiques aux ensembles pour réseaux de distribution publique (ERD). Les ERD satisfont aux critères suivants:
- ils sont utilisés pour la distribution de l'énergie électrique dans des systèmes triphasés pour lesquels la tension assignée ne dépasse pas 1 000 V en courant alternatif (se reporter à la Figure 101 représentant un réseau de distribution classique);
- ils sont fixes;
- les ENSEMBLES ouverts ne sont pas couverts par la présente norme;
- ils sont adaptés à une installation dans des emplacements où seules des personnes qualifiées ont accès pour leur utilisation; cependant, des ERD pour l'extérieur peuvent être installés dans des endroits susceptibles d'être accessibles à des personnes ordinaires;
- utilisation à l'intérieur ou à l'extérieur.
Cette deuxième édition annule et remplace la première édition parue en 2010. Elle constitue une révision technique. La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- confirmation que les essais effectués sur les ERD les plus exigeants sont présumés vérifier la performance des ensembles analogues et moins exigeants de mêmes constructions générales et valeurs assignées;
- conditions/ durées plus précises pour les essais de résistance à l'impact des ERD conçus pour fonctionner sous un climat arctique;
- correction de la direction de la force appliquée lors de l'essai de charge statique.
Cette publication doit être lue conjointement avec la CEI 61439-1:2011. Le contenu du corrigendum de mars 2015 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
24-Aug-2014
Current Stage
PPUB - Publication issued
Start Date
25-Aug-2014
Completion Date
25-Aug-2014
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IEC 61439-5
Edition 2.0 2014-08
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
IEC 61439-5:2014-08(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61439-5
Edition 2.0 2014-08
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
PRICE CODE
INTERNATIONALE
CODE PRIX
ICS 29.130.20 ISBN 978-2-8322-1831-0

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: 3 ----------------------
– 2 – IEC 61439-5:2014 © IEC 2014
CONTENTS

FOREWORD ......................................................................................................................... 3

1 Scope ............................................................................................................................ 5

2 Normative references..................................................................................................... 6

3 Terms and definitions .................................................................................................... 6

4 Symbols and abbreviations ............................................................................................ 7

5 Interface characteristics ................................................................................................. 7

6 Information .................................................................................................................... 8

7 Service conditions ......................................................................................................... 8

8 Constructional requirements .......................................................................................... 9

9 Performance requirements ........................................................................................... 11

10 Design verification ....................................................................................................... 11

11 Routine verification ...................................................................................................... 24

Annexes ............................................................................................................................. 25

Annex O (informative) Guidance on temperature rise verification ........................................ 26

Annex AA (normative) Cross-section of conductors ............................................................. 27

Annex BB (informative) Items subject to agreement between the ASSEMBLY

manufacturer and the user ........................................................................................... 29

Annex CC (informative) Design verification ......................................................................... 33

Annex DD (informative) List of notes concerning certain countries ...................................... 34

Bibliography ....................................................................................................................... 35

Figure 101 – Typical distribution network ............................................................................... 6

Figure 102 – Diagram of test to verify resistance to shock load of a PENDA-O ..................... 14

Figure 103 – Diagram of test to verify impact force withstand of a PENDA-O ........................ 15

Figure 104 – Diagram of test to verify the resistance to static load ....................................... 16

Figure 105 – Sandbag for test to verify the resistance to shock load .................................... 17

Figure 106 – Diagram of test to verify resistance to torsional stress of a PENDA-O .............. 18

Figure 107 – Diagram of test to verify the mechanical strength of doors ............................... 21

Figure 108 – Striker element for test of resistance to mechanical shock impacts

induced by sharp-edged objects .......................................................................................... 22

Figure 109 – Typical test arrangement for mechanical strength of base ................................ 23

Table 101 – Values of assumed loading ................................................................................ 8

Table 102 – Axial load to be applied to the inserts ............................................................... 22

Table AA.1 – Minimum and maximum cross-section of copper and aluminium

conductors, suitable for connection (see 8.8) ....................................................................... 27

Table AA.2 – Standard cross-sections of round copper conductors and approximate

relationship between mm and AWG/kcmil sizes (see 8.8 of Part 1) ..................................... 28

Table BB.1 – Items subject to agreement between the ASSEMBLY manufacturer and the

user 29

Table CC.1 – List of design verifications to be performed ..................................................... 33

---------------------- Page: 4 ----------------------
IEC 61439-5:2014 © IEC 2014 – 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,

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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

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

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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 61439-5 has been prepared by subcommittee 17D: Low-voltage

switchgear and controlgear assemblies, of IEC technical committee 17: Switchgear and

controlgear.

This second edition cancels and replaces the first edition published in 2010. It constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the latest

edition:

– confirmation that tests carried out on the most onerous PENDA are deemed to verify the

performance of similar and less onerous assemblies of the same general construction and

rating;

– more precise timing/conditions for impact force withstand tests for PENDAs designed for

operation in an arctic climate;
– correction of the direction of the applied force in the static load test.
---------------------- Page: 5 ----------------------
– 4 – IEC 61439-5:2014 © IEC 2014
The text of this standard is based on the following documents:
CDV Report on voting
17D/492/CDV 121B/13/RVC

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

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

This standard is to be read in conjunction with IEC 61439-1. The provisions of the general

rules dealt with in IEC 61439-1 (hereinafter referred to as Part 1) are only applicable to this

standard insofar as they are specifically cited. When this standard states “addition”,

“modification” or “replacement”, the relevant text in Part 1 is to be adapted accordingly.

Subclauses that are numbered with a 101 (102, 103 etc.) suffix are additional to the same

subclause in Part 1.
Tables and figures in this Part 5 that are new are numbered starting with 101.
New annexes in this Part 5 are lettered AA, BB, etc.
In this standard, terms written in small capitals are defined in Clause 3.

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

standard.

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 publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
 reconfirmed,
 withdrawn,
 replaced by a revised edition, or
 amended.
The contents of the corrigendum of March 2015 have been included in this copy.
---------------------- Page: 6 ----------------------
IEC 61439-5:2014 © IEC 2014 – 5 –
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES –
Part 5: Assemblies for power distribution in public networks
1 Scope

This part of IEC 61439 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 a.c. (see Figure 101 for a typical distribution network);

– stationary;
– open ASSEMBLIES are not covered by this standard;

– suitable for installation in places where only skilled persons have access for their use,

however, outdoor types may be installed in situations that are accessible to ordinary

persons;
– for indoor or outdoor use.

The object of this standard is to state the definitions and to specify the service conditions,

construction requirements, technical characteristics and tests for PENDAs. Network

parameters may require tests at higher performance levels.

PENDAs may also include control and or signalling devices associated with the distribution of

electrical energy.

This standard 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 may be carried out other than by the original manufacturer

(see 3.10.1 of IEC 61439-1:2011).

This standard 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.

This standard does not apply to specific types of ASSEMBLIES covered by other parts of

IEC 61439 series.
---------------------- Page: 7 ----------------------
– 6 – IEC 61439-5:2014 © IEC 2014
PENDA-I or PENDA-O
PENDA-O
Customers
MV/LV substation
Connecting points
IEC
Figure 101 – Typical distribution network

NOTE 1 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 61439-1:2011).

NOTE 2 Where local regulations and practices permit, a PENDA according to this standard can be used in other

than public networks.
2 Normative references
This clause of Part 1 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 61439-1:2011, Low-voltage switchgear and controlgear assemblies – Part 1: General

rules
ISO 6506-1, Metallic materials – Brinell hardness test – Part 1: Test method
3 Terms and definitions
This clause of Part 1 applies except as follows.
3.1 General terms
Additional terms:
---------------------- Page: 8 ----------------------
IEC 61439-5:2014 © IEC 2014 – 7 –
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 may, or may not, 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
3.3 External design of ASSEMBLIES
3.3.1
open-type ASSEMBLY
This term of Part 1 does not apply.
3.9 Verification
Modifications:
3.9.1
design verification
Delete the note.
3.9.1.2
verification comparison
This term of Part 1 does not apply.
3.9.1.3
verification assessment
This term of Part 1 does not apply.
4 Symbols and abbreviations
This clause of Part 1 applies.
5 Interface characteristics
This clause of Part 1 applies except as follows.
---------------------- Page: 9 ----------------------
– 8 – IEC 61439-5:2014 © IEC 2014
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 may be based on the values given in Table 101.
Table 101 – Values of assumed loading
Number of main circuits Assumed loading factor
2 and 3 0,9
4 and 5 0,8
6 to 9 inclusive 0,7
10 (and above) 0,6
6 Information
This clause of Part 1 applies except as follows.
6.1 Assembly designation marking
Addition to first paragraph:

Designation plates may be placed inside an enclosure of an ASSEMBLY provided their intended

place ensures good legibility and visibility when the door(s) is open or the cover is removed.

Replacement of item d):
d) 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 Part 1 applies except as follows.
7.1.1.2 Ambient air temperature for outdoor installations
Replacement of last paragraph with:
---------------------- Page: 10 ----------------------
IEC 61439-5:2014 © IEC 2014 – 9 –

Unless the user specifies a PENDA shall be suitable for use in an arctic climate, the lower

limit of ambient air temperature is –25 °C. For an arctic climate the lower limit of ambient

temperature is –50 °C.
7.2 Special service conditions
Addition of the following note to item h):

NOTE Exposure to vibration arising from traffic and/or occasional ground excavation is a normal service condition

for PENDAs.
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.
8 Constructional requirements
This clause of Part 1 applies except as follows.
8.1 Strength of materials and parts
8.1.1 General
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 may be direct coupled to a transformer by means of a flange coupling or it may

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 reliable locking device shall be provided on outdoor enclosures which prevents access by

unauthorized persons. Doors, lids and covers shall be so designed that, after they are locked,

they do not open due to subsequent moderate ground settlement, nor due to exposure to

vibration arising from traffic and/or ground excavation and reinstatement works.
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

flame retardant properties in accordance with 10.2.3.102 of this standard.
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 of this standard.

---------------------- Page: 11 ----------------------
– 10 – IEC 61439-5:2014 © IEC 2014

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.

Additional subclause:
8.1.101 Thermal stability
The thermal stability of a PENDA shall be verified according to 10.2.3.101.
8.2 Degree of protection provided by an ASSEMBLY enclosure
8.2.1 Protection against mechanical impact
Subclause 8.2.1 of Part 1 does not apply.

8.2.2 Protection against contact with live parts, ingress of solid foreign bodies and

water
Addition:
Open type ASSEMBLIES (IP00) are not covered by this standard.

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 of this standard.
8.4 Protection against electric shock
8.4.2.1 General
The third paragraph does not apply.
Additional subclause:
8.4.2.101 Earthing and short-circuiting means

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 manufacturer’s indicated degree of protection (IP code) is maintained for

all parts of the ASSEMBLY. This requirement is not applicable if it could cause a safety hazard

arising from the system conditions and/or operational practice.
8.4.3.1 Installation conditions
Additional paragraph:

For an ASSEMBLY that is expected 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 conductors
Replacement of the first three paragraphs with the following:
---------------------- Page: 12 ----------------------
IEC 61439-5:2014 © IEC 2014 – 11 –

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.

Where specified by the user, the incoming circuit shall be suitable for connection by means of

either bare or insulated bars.
Additional subclauses:
8.101 Marking as an obstacle to snow clearance

Where a PENDA-O is intended for use in regions where heavy snowfalls occur in accordance

with 7.2, or alternatively, if required by the user, it shall be possible to mark it 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. The holders shall be constructed in a manner which

ensures that the holder or marking rod will give way to a mechanical force before the

transmitted force to the PENDA-O’s enclosure reaches the value which would adversely affect

the degree of protection (IP code).
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 conditions for interchangeability of parts of the ASSEMBLY

may be subject to an agreement between the user and the manufacturer.

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 swi
...

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