SIST EN 60439-3:1998
(Main)Low-voltage switchgear and controlgear assemblies -- Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use - Distribution boards
Low-voltage switchgear and controlgear assemblies -- Part 3: Particular requirements for low-voltage switchgear and controlgear assemblies intended to be installed in places where unskilled persons have access for their use - Distribution boards
This standard gives supplementary requirements for enclosed distribution boards (DBU), which are stationary, type-tested assemblies (TTA) for indoor use, containing protective devices and intended for use either in domestic (household) applications or in other places where unskilled persons have access for their use.
Niederspannung-Schaltgerätekombinationen -- Teil 3: Besondere Anforderungen an Niederspannung-Schaltgerätekombinationen zu deren Bedienung Laien Zutritt haben - Installationsverteiler
Ensembles d'appareillage à basse tension -- Partie 3: Règles particulières pour ensembles d'appareillage à basse tension destinés à être installés en des lieux accessibles à des personnes non qualifiées pendant leur utilisation - Tableaux de répartition
Cette norme donne des prescriptions supplémentaires pour les tableaux de répartition (TRN) sous enveloppe lorsque ce sont des ensembles de série (ES) fixes comportant des dispositifs de protections et qu'ils sont destinés à être utilisés à l'intérieur, soit dans les applications domestiques soit en d'autres lieux où des personnes non qualifiées ont accès pendant leur utilisation.
Sestavi nizkonapetostnih stikalnih in krmilnih naprav – 3. del: Posebne zahteve za sestave nizkonapetostnih stikalnih naprav, predvidene za vgraditev na mestih, do katerih imajo dostop nestrokovne osebe – Razdelilniki
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60439-3:1998
01-februar-1998
Sestavi nizkonapetostnih stikalnih in krmilnih naprav – 3. del: Posebne zahteve za
sestave nizkonapetostnih stikalnih naprav, predvidene za vgraditev na mestih, do
katerih imajo dostop nestrokovne osebe – Razdelilniki
Low-voltage switchgear and controlgear assemblies -- Part 3: Particular requirements for
low-voltage switchgear and controlgear assemblies intended to be installed in places
where unskilled persons have access for their use - Distribution boards
Niederspannung-Schaltgerätekombinationen -- Teil 3: Besondere Anforderungen an
Niederspannung-Schaltgerätekombinationen zu deren Bedienung Laien Zutritt haben -
Installationsverteiler
Ensembles d'appareillage à basse tension -- Partie 3: Règles particulières pour
ensembles d'appareillage à basse tension destinés à être installés en des lieux
accessibles à des personnes non qualifiées pendant leur utilisation - Tableaux de
répartition
Ta slovenski standard je istoveten z: EN 60439-3:1991
ICS:
29.130.20 Nizkonapetostne stikalne in Low voltage switchgear and
krmilne naprave controlgear
SIST EN 60439-3:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 60439-3:1998
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SIST EN 60439-3:1998
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SIST EN 60439-3:1998
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SIST EN 60439-3:1998
CEI
NORME
IEC
INTERNATIONALE
439-3
INTERNATIONAL
Première édition
STANDARD
First edition
1990-12
Ensembles d'appareillage à basse tension
Troisième partie:
Règles particulières pour ensembles
d'appareillage BT destinés à être installés
en des lieux accessibles à des personnes
non qualifiées pendant leur utilisation -
Tableaux de répartition
Low-voltage switchgear and controlgear
assemblies
Part 3:
Particular requirements for low-voltage
switchgear and controlgear assemblies
intended to be installed in places where
unskilled persons have access for their use -
Distribution boards
© CEI 1990 Droits de reproduction réservés — Copyright — all rights reserved
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par aucun pro- any form or by any means, electronic or mechanical,
céda, électronique ou mécanique, y compris la photocopie et n
hcluding photocopying and microfilm, without permissio
les mkxoflkns. sans l'accord écrit de l'éditeur.
In writing /rom the publisher.
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Pour prix, volr catalogue en vigueur
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For price, see current catalogue
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SIST EN 60439-3:1998
439-3 ©IEC – 3 –
CONTENTS
Page
FOREWORD 5
Clause
1 General 9
2 9
Definitions
3 Classification of assemblies 13
4 13
Electrical characteristics of assemblies
5 15
Information to be given regarding the assembly
6 Service conditions 15
7 Design and construc on 15
ti
21
8 Test specifications
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SIST EN 60439-3:1998
439-3 © IEC - 5 -
INTERNATIONAL ELECTROTECHNICAL COMMISSION
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES
Part 3: Particular requirements for low-voltage switchgear and
controlgear assemblies intended to be installed in places
where unskilled persons have access for their use -
Distribution boards
FOREWORD
1)
The formal decisions or agreements of the IEC on technical matters, prepared by Technical Committees on
which all the National Committees having a special interest therein are represented, express, as nearly as
possible, an international consensus of opinion on the subjects dealt with.
2)
They have the form of recommendations for international use and they are accepted by the National
Committees in that sense.
3)
In order to promote international unification, the IEC expresses the wish that all National Committees
should adopt the text of the IEC recommendation for their national rules in so far as national conditions will
permit. Any divergence between the IEC recommendation and the corresponding national rules should, as
far as possible, be clearly indicated in the latter.
4)
The IEC has not laid down any procedure concerning marking as an indication of approval and has no
responsibility when an item of equipment is declared to comply with one of its recommendations.
This standard has been prepared by Sub-Committee 17D: Low-voltage switchgear and
controlgear assemblies, of IEC Technical Committee No. 17: Switchgear and controlgear.
The text of this standard is based on the following documents:
Six Months' Rule Report on Voting
17D(CO)36 17D(CO)40
Full information on the voting for the approval of this standard can be found in the Voting
Report
indicated in the above table.
Distribution boards shall comply with all requirements of IEC 439-1 (1985): Low-voltage
switchgear and controlgear assemblies, Pa
rt 1: Requirements for type-tested and partially
type-tested assemblies, if not otherwise indicated hereinafter and shall also comply with
the particular requirements contained in this publication.
The clauses of this standard supplement, modify or replace clauses in IEC 439-1 (1985).
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SIST EN 60439-3:1998
439-3 ©IEC - 7 -
Where there is no corresponding clause or sub-clause in this standard, the clause or sub -
clause of the main document applies without modification.
In view of the fact that this publication should be read in conjunction with IEC 439-1, the
numbering of its clauses and sub-clauses correspond to the la tter.
The following lEC publications are quoted in
this standard:
Publications Nos. 269-3 (1987): Low-voltage fuses, Part 3: Supplementary requirements for fuses for use
by unskilled persons (fuses mainly for household and similar applications).
529 (1989): Degrees of protection provided by enclosures (IP Code).
695-2-1 (1980): Fire hazard testing, Part 2: Test methods - Glow-wire test and guidance.
Other publication quoted:
ISO 4046 (1978): Paper, board, pulp and related terms - Vocabulary.
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SIST EN 60439-3:1998
439-3 © IEC
LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR ASSEMBLIES
Part 3: Particular requirements for low-voltage switchgear and
controlgear assemblies intended to be installed in places
where unskilled persons have access for their use -
Distribution boards
1 General
1.1
Scope
Replace the second note by:
This standard gives supplementary requirements for such enclosed distribution boards
(DBU), which are stationary, type tested assemblies (TTA) for indoor use, containing
protective devices and intended for use either in domestic (household) applications or in
other places where unskilled persons have access for their use. Control and/or signalling
devices may also be included. They are for use on a.c., with a nominal voltage to earth not
exceeding 300 V. The outgoing circuits contain short-circuit protective devices, each
having a rated current not exceeding 125 A with a total incoming load current not
exceeding 250 A.
NOTE - The nominal voltage to earth in an IT system is taken as the nominal voltage of the system.
Unskilled persons normally have access to these assemblies, e.g. for switching operations
and for replacing fuse-links.
Requirements for assemblies for outdoor use are under consideration.
2 Definitions
2.1
Genera! definitions
2.1.1.2
Partially type tested assembly (PTTA)
Not applicable.
2.1.9
Test situation
Not applicable.
2.1.10
Distribution board
An assembly containing switching or protective devices (e.g. fuses or miniature circuit-
breakers) associated with one or more outgoing circuits fed from one or more incoming
circuits, together with terminals for the neutral and protective circuit conductors. It may
also include signalling and other control devices. Means of isolation may be included in
the board or may be provided separately.
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SIST EN 60439-3:1998
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439-3 ©IEC
Definitions concerning constructional units of assemblies
2.2
2.2.8 Withdrawable part
Not applicable.
2.2.9
Connected position
when it is fully connected for its normally intended
The position of a removable pa rt
function.
2.2.10
Test position
Not applicable.
2.2.11 Disconnected position
Not applicable.
2.3 Definitions concerning the external design of assemblies
2.3.1
Open-type assembly
Not applicable.
2.3.2 Dead front assembly
Not applicable.
2.3.3.3 Desk-type assembly
Not applicable.
2.3.4 Busbar trunking system (busway)
Not applicable.
2.4 Definitions concerning the structural parts of assemblies
2.4.15 Parts for aesthetic purposes
Parts which are provided only to improve the appearance of an assembly and are not
intended to give any electrical or mechanical protection.
2.5 Definitions concerning the conditions of installation of assemblies
2.5.4
Movable assembly
Not applicable.
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SIST EN 60439-3:1998
439-3 © IEC - 13 -
2.7
Gangways within assemblies
Not applicable.
3 Classification of assemblies
Delete:
- the conditions of installation with respect to mobility (see 2.5.3 and 2.5.4).
4 Electrical characteristics of assemblies
4.2 Rated current (of a circuit of an assembly)
Renumber existing 4.2 to read 4.2.1.
Add a new sub-clause:
4.2.2 Rated current of a distribution board
The rated current of a distribution board is that stated by the manufacturer as the rated
current of the incoming circuit or circuits. If there is more than one incoming circuit the
rated current of a distribution board is the arithmetic sum of the rated currents of all
incoming circuits that are intended to be used simultaneously. This current or currents
shall be carried without the temperature rise of the several parts exceeding the limits
specified in 7.3 when tested according to 8.2.1.
4.8 Rated diversity factor
Replace the note and Table I by the following:
For the purpose of this standard the number of main circuits is the number of outgoing
circuits connected to each supply phase. In the absence of information concerning the
actual currents, the conventional values given in Table 1 may be used.
Table 1
Number of main circuits Diversity factor
2 and 3 0.8
4 and 5 0.7
6 to 9 inclusive 0.6
10 (and above) 0.5
Delete the last sentence of 4.8.
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SIST EN 60439-3:1998
439-3 © IEC -15 -
5 Information to be given regarding the assembly
5.1 Nameplates
Add as second sentence:
The nameplates may be mounted behind a door or removable cover.
In the fourth line replace q)
by r).
In c) replace 439-1
by 439-3.
Replace the text of I) by:
/) degree of protection (see 7.4.2.2.1), if greater than IP2XC according to IEC 529;
Add:
r) rated current of distribution board (see 4.2.2).
5.2
Markings
Add:
The diagrams and symbols used shall comply with the relevant IEC standards.
6 Service conditions
6.2.9
Delete the examples.
Add:
For flush-type assemblies recessing into a wall is not considered to be a special condition.
7 Design and construction
7.1.1
General
Add the following at the beginning of the first paragraph:
Assemblies intended for use by unskilled persons shall be designed as type-tested LV
switchgear and controlgear assemblies (TTA).
Add at the end of the first paragraph:
For parts of distribution boards which are made of insulating materials the resistance
to heat shall be verified according to 8.2.11. The resistance of insulating materials to
abnormal heat and to fire due to internal electric effects shall be verified according
to 8.2.12.
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SIST EN 60439-3:1998
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439-3 ©IEC
Add a second sentence to the second paragraph:
s of distribution boards, including enclosures, shall have adequate
Ferrous structural pa rt
resistance to rusting when tested in accordance with 8.2.10.
Add a second sentence and note to the third paragraph:
Enclosures of distribution boards shall, in addition, withstand an impact strength test in
accordance with 8.2.9.
NOTE - Parts for aesthetic purposes and individual components need not be subjected to the impact
tests.
Add to the end of the clause:
Any cover which has to be removed during installation or maintenance shall not be used to
support components to which conductors are connected if such conductors are subject to
any stress when the cover is removed. In this case, a hinged door shall be used instead.
Doors and the like provided with hinges shall allow free access and ease of operation of
built-in components.
7.1.2.2 Isolating distances
Not applicable.
7.1.3.5 Replace by:
Provision shall be made for the terminals for outgoing neutral conductors to correspond in
number to the number of outgoing neutral conductors. These terminals shall be located or
identified in the same sequence as their respective phase conductor terminals.
Terminals shall also be provided for the protective conductors of the incoming and out-
going circuits, which shall be similarly located or identified, and for any bonding conduc-
tors that may be required (e.g. as appropriate to the system).
7.2.1.1
Delete reference to IP00.
7.2.1.5 Not applicable.
...
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