Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz and 1,6 MHz to 30 MHz - Part 4-2: Low voltage decoupling filters - Safety requirements

This product safety standard applies to electrical equipment, such as decoupling filters and phase couplers in a mains communication system for a phase to neutral voltage not exceeding AC 250 V and a nominal current not exceeding 125 A, intended for household and similar fixed-electrical installations including residential, commercial and light industrial buildings

Signalübertragung auf elektrischen Niederspannungsnetzen im Frequenzbereich 3 kHz bis 148,5 kHz und 1,6 MHz zu 30 MHz - Teil 4-2: Niederspannungs-Entkopplungsfilter - Sicherheitsanforderungen

Transmission de signaux sur les réseaux électriques basse tension dans la bande de fréquences de 3 kHz à 148,5 kHz et de 1,6 MHz à 30 MHz - Partie 4-2: Filtres basse tension de découplage - Exigences de sécurité

Signalling on low voltage electrical installations in the frequency range 3 kHz to 148,5 kHz - Part 4-2: Low voltage decoupling filters - Safety requirements

General Information

Status
Published
Publication Date
23-Aug-2001
Current Stage
6060 - Document made available
Start Date
24-Aug-2001
Completion Date
24-Aug-2001

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SLOVENSKI SIST EN 50065-4-2:2003
STANDARD
februar 2003

Signalling on low voltage electrical installations in the frequency range 3 kHz to

148,5 kHz - Part 4-2: Low voltage decoupling filters - Safety requirements
ICS 31.160; 33.040.30 Referenčna številka
SIST EN 50065-4-2:2003(en)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD EN 50065-4-2
NORME EUROPÉENNE
EUROPÄISCHE NORM August 2001
ICS 31.160; 33.040.30
English version
Signalling on low voltage electrical installations
in the frequency range 3 kHz to 148,5 kHz
Part 4-2: Low voltage decoupling filters -
Safety requirements
Transmission de signaux sur les réseaux Signalübertragung auf elektrischen
électriques basse tension dans la bande Niederspannungsnetzen im
de fréquences de 3 kHz à 148,5 kHz Frequenzbereich 3 kHz bis 148,5 kHz
Partie 4-2: Filtres basse tension de Teil 4-2: Niederspannungs-
découplage - Entkopplungsfilter -
Exigences de sécurité Sicherheitsanforderungen

This European Standard was approved by CENELEC on 2000-11-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

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

Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,

Portugal, Spain, Sweden, Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50065-4-2:2001 E
---------------------- Page: 2 ----------------------
EN 50065-4-2:2001 - 2 -
Foreword

This European Standard was prepared by SC 205A, Mains communicating systems, of Technical

Committee CENELEC TC 205, Home and Building Electronic Systems (HBES).

This European Standard has been prepared under a mandate given to CENELEC by the European

Commission and covers the essential requirements of the Low Voltage Directive 73/23/EEC.

The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC

as EN 50065-4-2 on 2000-11-01.
The following dates were fixed:
- latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2002-02-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2003-11-01

EN 50065 consists of the following parts, under the general title: Signalling on low voltage electrical

installations in the frequency range 3 kHz to 148,5 kHz
Part 1 General requirements, frequency bands and electromagnetic disturbances
Part 2-1 Immunity requirements for mains communications equipment and systems

operating in the range of frequencies 95 kHz to 148,5 kHz and intended for use in

residential, commercial and light industrial environments
Part 2-2 Immunity requirements for mains communications equipment and systems

operating in the range of frequencies 95 kHz to 148,5 kHz and intended for use in

industrial environments
Part 2-3 Immunity requirements for mains communications equipment and systems
operating in the range of frequencies 3 kHz to 95 kHz and intended for use by
electricity suppliers and distributors
Part 4-1 Low voltage decoupling filters – Generic specification
Part 4-2 Low voltage decoupling filters – Safety requirements
Part 4-3 Low voltage decoupling filters – Incoming filter
Part 4-4 Low voltage decoupling filters – Impedance filter
Part 4-5 Low voltage decoupling filters – Segmentation filter
Part 4-6 Low voltage decoupling filters – Phase coupler
Part 7 Equipment impedance
__________
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- 3 - EN 50065-4-2:2001
Contents

1 Scope.......................................................................................................................................... 4

2 Normative references................................................................................................................. 4

3 Definitions .................................................................................................................................. 5

4 General requirements ................................................................................................................ 6

5 General notes on tests............................................................................................................... 6

6 Rating ......................................................................................................................................... 6

7 Classification.............................................................................................................................. 7

8 Marking....................................................................................................................................... 7

9 Dimensions................................................................................................................................. 9

10 Protection against electric shock.............................................................................................. 9

11 Provision for protective earthing.............................................................................................10

12 Terminals ................................................................................................................................. 11

13 Construction............................................................................................................................. 12

14 Resistance to ageing, to harmful ingress of water and to humidity ...................................... 13

15 Insulation resistance and dielectric strength.......................................................................... 16

16 Temperature rise ...................................................................................................................... 17

17 Mechanical strength................................................................................................................. 19

18 Resistance to heat.................................................................................................................... 20

19 Screws, current-carrying parts and connections ................................................................... 20

20 Creepage distances, clearances and distances through sealing compound........................ 22

21 Resistance to abnormal heat, to fire and to tracking.............................................................. 25

22 Resistance to rusting............................................................................................................... 26

23 Components ............................................................................................................................. 26

24 Abnormal conditions................................................................................................................ 27

25 Protection against short-circuit............................................................................................... 29

26 Resistance to transients .......................................................................................................... 29

Tables

Table 1 Symbols for identification of the termination .................................................................... 8

Table 2 Connectable cross-sections of copper conductors ........................................................ 12

Table 3 Test current ....................................................................................................................... 18

Table 4 Permissible temperature rise............................................................................................18

Table 5 Related torque................................................................................................................... 19

Table 6 Creepage distances and clearances ................................................................................ 23

Table 7 Creepage distances for printed circuit board .................................................................. 22

Table 8 Minimum clearances for printed circuit board................................................................. 24

---------------------- Page: 4 ----------------------
EN 50065-4-2:2001 - 4 -
1 Scope

This product safety standard applies to electrical equipment, such as decoupling filters and phase

couplers in a mains communication system for a phase to neutral voltage not exceeding AC 250 V and a

nominal current not exceeding 125 A, intended for household and similar fixed-electrical installations

including residential, commercial and light industrial buildings
2 Normative references

This European Standard incorporated by dated or undated reference, provisions from other publications.

These normative references are cited at the appropriate places in the text and the publications are listed

hereafter. For dated references, subsequent amendments to or revisions of any of these publications

apply to this European Standard only when incorporated in it by amendment or revision. For updated

references the latest edition of the publication referred to applies.
EN 60065 Audio, video and similar electronic apparatus – Safety requirements
(IEC 60065)

EN 60068-2-75 1997 Environmental testing – Part 2-75: Tests – Test Eh Hammer tests

(IEC 60068-2-75:1997)
EN 60127 series Miniature fuses (IEC 60127 series)
EN 60417 series Graphical symbols for use on equipment (IEC 60417 series)
EN 60529 Degrees of protection provided by enclosures (IP code) (IEC 60529)

EN 60669-1 1999 Switches for household and similar fixed electrical installations –

Part 1: General requirements (IEC 60669-1:1998, mod.)

EN 60695-2-1/X 1996 Fire hazard testing- Part 2: Test methods (IEC 60695-2-1/X:1994)

EN 60721-3-3 1995 Classification of environmental conditions – Part 3: Classification of groups of

environmental parameters and their severities – Section 3: Stationary use at
weather protected locations (IEC 60721-3-3:1994)

EN 60999-1 2000 Connecting devices – Safety requirements for screw-type and screwless-type

clamping units for electrical copper conductors – Part 1: General requirements
and particular requirements for conductors from 0,5 mm up to
35 mm (included) (IEC 60999-1:1999)

EN 132400 1994 Sectional Specification: Fixed capacitors for electromagnetic interference

suppression and connection to the supply mains (Assessment level D)

HD 214 S2 1980 Method of determining the comparative and the proof tracking indices of solid

insulating materials under moist conditions (IEC 60112:1979)

HD 384.4.442 S11997 Electrical installations of buildings – Part 4: Protection for safety –

Chapter 44 Protection against overvoltages - Section 442: Protection of low-
voltage installations against faults between high-voltage systems and earth
(related to IEC 60364-4-442:1993 + A1:1995)

HD 625.1 S1 1996 Insulation coordination for equipment within low-voltage systems –

Part 1: Principles, requirements and tests (IEC 60664-1:1992, mod.)

IEC 60695–10-2 1995 Fire hazard testing – Part 10: Guidance and test methods for the minimisation

of the effects of abnormal heat on electrotechnical products involved in fires –
Section 2 Method for testing products made from non-metallic materials for
resistance to heat using the ball pressure test
---------------------- Page: 5 ----------------------
- 5 - EN 50065-4-2:2001

IEC 60999-2 1995 Connecting devices – Safety requirements for screw-type and screw-less

clamping units for electrical copper conductors – Part 2: Particular requirements

2 2
for conductors from 35 mm up to 300 mm
3 Definitions

Where the term’s voltage and current are used, they imply r.m.s. values, unless otherwise specified.

For the purpose of this standard, the following definitions apply:
3.1
decoupling filter

a device which attenuates incoming or outgoing signals within a specified frequency range

3.2
phase coupler

a device which transmits a signal within a specified frequency range from one phase to another in a multi-

phase installation
3.3
fault conditions
abnormal conditions which may occur during normal operation
3.4
enclosed equipment
equipment which is mounted and/or applied without an additional enclosure
3.5
unenclosed equipment

equipment intended to be built into an enclosure which completely covers the equipment

3.6
partly enclosed equipment

equipment intended to be built into an appropriate enclosure which only covers the unenclosed part of the

equipment

NOTE Flush-mounted equipment intended to be located in a box is an example of such equipment.

3.7
terminal

the conductive part of one pole, composed of one or more clamping unit(s) and insulation if necessary

3.8
screw-type terminal

a clamping unit for the connection and subsequent disconnection of one conductor or the interconnection

and subsequent disconnection of two ore more conductors, the connection being made, directly or

indirectly, by means of screws or nuts of any kind
3.9
screwless-type terminal

a clamping unit for the connection and subsequent disconnection of one conductor or the interconnection

and subsequent disconnection of two ore more conductors, the connection being made, directly or

indirectly, by means other than screws
3.10
nominal voltage
the voltage assigned to the equipment by the manufacturer
3.11
nominal current

the nominal maximum operating current assigned to the equipment by the manufacturer

3.12
conditional short-circuit current

a value of the AC component of a prospective current, which the equipment protected by a suitable short-

circuit protective device (hereafter referred to as SCPD) in series can withstand under specified

conditions of use and behaviour.
---------------------- Page: 6 ----------------------
EN 50065-4-2:2001 - 6 -
4 General requirements

Equipment and its enclosures shall be so designed and constructed that, in normal use, their

performance is reliable and without danger to the user or the surroundings.

In general, compliance is checked by carrying out all the tests specified, where applicable.

5 General notes on tests
Tests according to this standard are type tests.

5.1 The samples are tested as delivered and under normal conditions of use, having regard to the

classification of the equipment and to the manufacturer's installation instructions.

5.2 Unless otherwise specified, the tests are carried out in the order of the clauses at an ambient

temperature of 20 °C ± 5 °C.
5.3 The required number of samples shall be 9.

Three samples are subjected to all the relevant tests, except the test of clauses 23 and 24 where three

other samples are used, and the tests of clauses 25 and 26 where another three samples are used.

5.4 Equipment is deemed not to comply with this standard if any sample does not pass the tests of 21.1,

25 and 26, and if there are more failures than that of one sample in any of the other tests.

If no sample has failed during the tests of 21.1, 25 and 26, but one sample has failed in another way

during any of the other tests, the test which caused the failure and those preceding which may have

influenced the result of that test, are repeated on another set of samples, as specified in 5.4, all of which

shall then comply with the repeated tests.

NOTE 1 In general, it will be necessary only to repeat the test that caused the failure, unless the sample fails in the mechanical

strength test of clause 17, in which case the ageing test of clause 14 is repeated.

NOTE 2 The applicant may submit, together with the number of samples specified in 5.4, the additional set of samples which may

be required should one sample fail. The testing laboratory will then, without further request, test the additional samples and will

reject only if a further failure occurs. If the additional set of samples is not submitted at the same time, a failure of one sample will

entail a rejection.
6 Rating
6.1 Standard values of nominal voltages are AC 230 V and AC 400 V.

If a different nominal voltage is applied this value shall not be less than 220 V.

6.2 Standard values of nominal currents are 10 A, 16 A, 20 A, 25 A, 32 A, 40 A, 50 A, 63 A, 80 A, 100 A

and 125 A.

6.3 Standard cross-sectional areas of conductors are 1,5 mm², 2,5 mm², 4 mm², 6 mm², 10 mm²,

16 mm², 25 mm², 35 mm² and 50 mm²

Compliance with the requirements of 6.1 to 6.3 is checked by inspection of the marking.

---------------------- Page: 7 ----------------------
- 7 - EN 50065-4-2:2001
7 Classification
7.1 Equipment is classified as follows:
7.1.1 According to protection against direct contact and external influences:
− enclosed equipment (minimum IP2X) for separate mounting;
− unenclosed equipment for mounting in an adequate enclosure.
NOTE 1 The degrees of protection are based on EN 60529.

NOTE 2 For unenclosed the protection against electric shock is given by the enclosure in which the equipment is intended to be

mounted. For enclosed equipment, the protection against electric shock is provided by compliance with the requirements of

clause 10.
7.1.2 According to the degree of protection against ingress of water:
The degrees of protection are based on EN 60529.
7.1.3 According to the method of mounting
− surface-type equipment;
− flush-type equipment;
− panel board equipment.
7.1.4 According to environmental temperature conditions
The classifications are based on EN 60721-3-3.
− class 3K4 + 5 °C to + 40 °C for indoor locations
− class 3K5 - 5 °C to + 45 °C for unprotected indoor locations
− class 3K6 - 25 °C to + 55 °C for outdoor locations
− class 3K8H - 25 °C to + 70 °C for severe environments
7.1.5 According to the rated impulse withstand voltage
The rated impulse withstand voltages are based on HD 625.1.
- 4000 V according to overvoltage category III;
- 6000 V according to overvoltage category IV.
8 Marking
8.1 As a minimum the equipment shall be marked with:
a) nominal voltage(s) in volts ~;
b) nominal current in amperes;

c) manufacturer's or responsible vendor's name, trade mark or identification mark;

d) type of filter or phase coupler and reference or catalogue number;
e) symbol for temperature range, if different from class 3K4;
f) symbol for degree of protection, if higher than IP2X;
---------------------- Page: 8 ----------------------
EN 50065-4-2:2001 - 8 -

g) symbol for degree of protection against ingress of water, if higher than IPX0. In such case

the symbol for degree of protection against harmful ingress of solid foreign bodies shall also

be marked, even if not higher than IP2X.

h) marking with conditional short-circuit current and suitable SCPD shall be given in the

manufacturer’s catalogues
8.2 Symbols for marking shall be used as follows:
Amperes A
Volt V
Alternating current ~
Degree of protection against moisture
IPX4 or IPX5
The letter “X” shall be replaced by the relevant number.

The figure for the current rating shall be placed before or above that for the nominal voltage and

separated from the latter by an oblique line or a dash.

NOTE The marking for current, voltage and nature of supply may be, for instance, as follows: 16 A 230 V~or 16/230~.

8.3 The manufacturer's or responsible vendor's name, trademark or identification mark, type reference

and nominal current shall be on the main part of the equipment.

Parts such as cover plates, which are necessary for safety purposes and are intended to be sold

separately, shall be marked with the manufacturer's or responsible vendor's name, trade mark or

identification mark and type reference.

The symbol for degree of protection, if applicable, shall be marked on the outside of its associated

enclosure so as to be easily discernible when the equipment is mounted and wired as in normal use.

NOTE 1 Additional type references may be marked on the main part, or on the outside or the inside of the associated enclosure.

NOTE 2 The term "main" part means the part carrying the terminals and any part integral with them; it does not include parts

intended to be sold separately.
8.4 Terminals

The side name (Input side, output side) and the respective termination shall be marked, when

appropriate, in such a way that they are clearly distinguished (e.g. using a different colour for each side).

These indications shall not be placed on screws or any other easily removable parts.

NOTE "Easily removable parts" are those parts, which can be removed during the normal installation of the equipment.

For example a typical marking scheme is given in Table 1.
Table 1 - Symbols for identification of the termination
Single phase Three phase
Point of connection Identification Point of connection Identification
Line L 1st Phase L1,
2nd Phase L2,
3rd Phase L3
Neutral N Neutral N
Earth EN 60417 Earth EN 60417
Symbols 5019 Symbols 5019
Communication 1 C1 Communication 1 C1
Communication 2 C2 Communication 2 C2

Terminals associated with any one pole shall have similar identification differing from that of the terminals

associated with the other poles, unless the relationship is self-evident.
---------------------- Page: 9 ----------------------
- 9 - EN 50065-4-2:2001
8.5 Terminals shall additionally be marked in accordance with 7.4 in EN 60999-1.
Compliance is checked by inspection.
8.6 Marking shall be durable and easily legible.
Compliance is checked by inspection and by the following test.

The test is made by rubbing the marking by hand for 15 s with a piece of cloth soaked with water and

again for 15 s with a piece of cloth soaked with petroleum spirit.

Marking made by impression, moulding, pressing or engraving is not subjected to this test.

NOTE 1 The petroleum spirit used should consist of a solvent hexane with a content of aromatics of maximum 0,1 % by volume, a

value of 29 % for kauri-butanol, an initial boiling-point of approximately 65 °C, a dry-point of approximately 69 °C and a density of

approximately 0,68 g/cm³.

NOTE 2 The type reference may be marked with paint or ink, protected, if necessary, by vanish.

8.7 The correct installation and use of the equipment shall be indicated in an installation instruction

delivered with the equipment. A phase coupler shall be delivered with a marking plate with the following

text:
Phase Coupler !
Must be disconnected while working on the installation.

The marking plate shall be fastened to the panel board in which the phase coupler is installed.

The installation instruction and the text of the marking plate shall be written in the official language(s) of

the country in which the equipment is to be sold.
Compliance is checked by inspection.
NOTE In the following country the marking plate is not necessary: Germany.
9 Dimensions
Equipment shall comply with the appropriate standard sheets.
Compliance is checked by inspection and by measurement.
10 Protection against electric shock

10.1 Equipment shall be so designed that live parts are not accessible when the equipment is mounted

and wired as for normal use, even after removal of parts which can be removed without the aid of a tool.

Compliance is checked by inspection and, if necessary, by the following test.

The sample is mounted as in normal use and fitted with conductors of the smallest cross-sectional area

specified in clause 12. The test is repeated using conductors of the largest cross-sectional area specified

in clause 12.

The standard test finger specified in EN 60529 is applied to the sample in every possible position, an

electrical indicator, with a voltage not less than 40 V and not more than 50 V, being used to show contact

with the relevant part.
---------------------- Page: 10 ----------------------
EN 50065-4-2:2001 - 10 -

Equipment, having enclosures or covers in thermoplastic or elastomeric material, is subjected to the

following additional test, which is carried out at an ambient temperature according to the maximal

temperature specified under the environmental classification ± 2 °C.

The equipment shall be installed as in normal use at this temperature and preheated with the nominal

current and voltage connected for at least one hour.

During this additional test, the equipment is subjected for 1 min to a force of 75 N, applied through the tip

of a straight unjointed test finger of the same dimensions as the standard test finger.

This test finger, with an electrical indicator as described above, is applied to all places where yielding of

insulating material could impair the safety of the equipment. The test is not made on membranes. A force

of only 10 N is applied to thin-walled knock-outs.

During this test, the equipment with its associated mounting means shall not deform to such an extent

that live parts can be touched by the unjointed test finger.
NOTE Membranes are tested according to 14.4.1 only.

10.2 Accessible parts shall be of insulating material with the exception of small screws and the like

which are isolated from live parts and which are used for fixing bases or cover plates.

However accessible parts may be made of metal if the requirements of either 10.2.1 or 10.2.2 are fulfilled.

10.2.1 Covers or cover plates shall be separated from live parts by supplementary insulation, made by

insulating linings or insulating barriers fixed to the covers or cover plates, or to the body of the equipment

in such a way that this supplementary insulation
− cannot be removed without being permanently damaged, or

− is so designed that it cannot be replaced in an incorrect position and that, if they omitted, the

equipment is rendered inoperable or manifestly incomplete. There shall be no:

− risk of accidental connection between live parts and metal covers or cover plates, for

example through their fixing screws, even if a conductor should come away from its

terminal,

− risk of a reduction of creepage distances or clearances below the values specified in

clause 20.

10.2.2 Accessible conductive parts, which are not separated from live parts by supplementary insulation,

made by insulating linings or insulating barriers, shall be permanently and reliably connected to the

protective earth terminal.

Compliance with 10.2.1 and 10.2.2 is checked by inspection and by the tests of clauses 15 and 20. For

10.2.2 the additional requirements in clause 11 shall be tested.

NOTE Insulating coating sprayed on the inside or on the outside of the metal covers or cover plates is not deemed to be an

insulating lining or barrier for the purpose of this subclause.
11 Provision for protective earthing

11.1 Earthing terminals shall be terminals with screw clamping or with other means of comparable

effectiveness and shall comply with the appropriate requirements of clause 12.

They shall be of the same size as the corresponding terminals for the supply conductors except that any

additional external earthing terminal shall be of a size suitable for conductors of at least 6 mm².

---------------------- Page: 11 ----------------------
- 11 - EN 50065-4-2:2001

11.2 Decoupling filters having more than one cable inlet shall be provided with an internal earthing

terminal allowing the connection of an incoming and outgoing conductor for the continuity of the earthing

circuit.

Compliance with the requirements of 11.1and 11.2 are checked by inspection and the tests of clause 12.

11.3 The connection between the earthing terminal and accessible metal parts to be connected thereto

shall be of low resistance.
Compliance is checked by the following test:

A current derived from a.c. source having a no-load voltage not exceeding 12 V and equal to 1,5 times

rated current or 25 A, whichever is greater, is passed between the earthing terminal and each of the

accessible metal parts in turn

The voltage drop between the earthing terminal and the accessible metal part is measured, and the

resistance calculated from the current and this voltage drop.
In no case the resistance shall exceed 0,05 Ω.
12 Terminals

The requirements in 12.1 and 12.2 are only for clamping units connected to power circuits.

12.1 General

12.1.1 Equipment shall be provided with terminals having screw-type or screwless-type clamping units.

12.1.2 Clamping units shall allow the conductor to be connected without special preparation.

12.1.3 The means for clamping the conductors in the clamping units shall not serve to fix any other

component, although they may hold the clamping units in place or prevent them from turning.

Compliance is checked by inspection and by the test of 12.2 as applicable.

12.2 Screw-type and screwless-type clamping units with clamping for external copper

conductors

12.2.1 Screw-type and screwless-type clamping units shall comply with EN 60999-1 or IEC 60999-2.

All the tests shall be with the clamping units mounted in the equipment.

The clamping units shall be tested with the cross-sectional area of conductors given in Table 2.

---------------------- Page: 12 ----------------------
EN 50065-4-2:2001 - 12 -
Table 2 - Connectable cross-sections of copper conductors
Type of conductor and cross-sectional area
Ranges of nominal current In (mm²)
...

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