Railway applications - Railway rolling stock cables having special fire performance - Thin wall - Part 4: Multicore and multipair screened or not screened sheathed cables

EN 50306-4 specifies requirements for, and constructions and dimensions of, multicore and multipair cables rated voltage Uo/U: 300/500 V, of the following types:
- unscreened, sheathed for either exposed or protected wiring, 0,5 mm2 to 2,5 mm2, number of cores from 2 to 48;
- screened, sheathed for either exposed or protected wiring, 0,5 mm2 to 2,5 mm2, number of cores from 2 to 8;
- unscreened, sheathed for either exposed or protected wiring, 0,5 mm2 to 1,5 mm2, number of screened pairs of cores from 2 to 7;
- screened, sheathed for either exposed or protected wiring, 0,5 mm2 to 1,5 mm2, number of unscreened pairs of cores from 2 to 7.

Bahnanwendungen - Kabel und Leitungen für Schienenfahrzeuge mit verbessertem Verhalten im Brandfall - Reduzierte Isolierwanddicken - Teil 4: Mehradrige und mehrpaarige Leitungen

Applications ferroviaires - Câbles pour matériel roulant ferroviaire ayant des performances particulières de comportement au feu - Isolation mince - Partie 4: Câbles multiconducteurs et multipaires gainés blindés ou non blindés

Le présent document définit les exigences de construction et dimensionnelles des câbles multiconducteurs et multipaires, de tension assignée U0/U = 300 V/500 V, des types suivants: - câbles gainés non blindés pour câblage exposé ou protégé (section de 0,5 mm2 à 2,5 mm2, 2 à 48 conducteurs); - câbles gainés blindés pour câblage exposé ou protégé (section de 0,5 mm2 à 2,5 mm2, 2 à 8 conducteurs); - câbles gainés non blindés pour câblage exposé ou protégé (section de 0,5 mm2 à 1,5 mm2, 2 à 7 paires de conducteurs blindés). - câbles gainés blindés pour câblage exposé ou protégé (section de 0,5 mm2 à 1,5 mm2, 2 à 7 paires de conducteurs non blindés). Tous les câbles sont constitués d'âmes câblées en cuivre étamé sous enveloppe isolante et gaine sans halogènes d'épaisseur mince. Ces types de câbles sont spécifiés pour les situations exposées (classe E) et pour les situations protégées (classe P). Ils sont destinés aux câblages fixes, ou aux câblages dont les flexions en service sont limitées, dans le matériel roulant ferroviaire. Ces câbles sont conçus pour résister à des contraintes thermiques occasionnelles provoquant un vieillissement thermique équivalent à celui résultant d’un fonctionnement continu à 90 °C. Pour les câbles normalisés, cette température est déterminée par l’essai d’acceptation décrit dans l’EN 50305, qui consiste à appliquer un vieillissement thermique accéléré de longue durée (5 000 h) indiquant un indice de température de 110 °C/20 000 h. Si le client exigeait des prédictions de durée de vie, ces prédictions seraient fondées sur l’indice de température du produit tel que fourni par le fabricant. La température maximale en cas de court-circuit est de 160 °C pour une durée de 5 s. Lorsqu'ils sont soumis au feu, les câbles présentent des caractéristiques de performance particulières quant aux valeurs maximales admissibles relatives à la propagation de la flamme et l'émission de fumées et de gaz toxiques. Ces exigences permettent aux câbles de satisfaire au niveau de risque 3 de l’EN 45545-1 et de l’EN 45545-2. L’EN 50306 4:2020 est prévu pour être utilisé conjointement avec l’EN 50306 1:2020, Exigences générales, l’EN 50306-2:2020, Câbles monoconducteurs, et l’EN 50306 3:2020, Câbles monoconducteurs et multiconducteurs blindés avec gaine d’épaisseur mince.

Železniške naprave - Kabli v železniških vozilih s posebno požarno odpornostjo - Tanka stena - 4. del: Večžilni in večparni zaslonjeni in nezaslonjeni oplaščeni kabli

General Information

Status
Published
Public Enquiry End Date
31-Jan-2019
Publication Date
20-Apr-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
02-Apr-2020
Due Date
07-Jun-2020
Completion Date
21-Apr-2020

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SLOVENSKI STANDARD
SIST EN 50306-4:2020
01-junij-2020
Nadomešča:
SIST EN 50306-4:2003
Železniške naprave - Kabli v železniških vozilih s posebno požarno odpornostjo -

Tanka stena - 4. del: Večžilni in večparni zaslonjeni in nezaslonjeni oplaščeni kabli

Railway applications - Railway rolling stock cables having special fire performance - Thin

wall - Part 4: Multicore and multipair screened or not screened sheathed cables
Bahnanwendungen - Kabel und Leitungen für Schienenfahrzeuge mit verbessertem
Verhalten im Brandfall - Reduzierte Isolierwanddicken - Teil 4: Mehradrige und
mehrpaarige Leitungen
Applications ferroviaires - Câbles pour matériel roulant ferroviaire ayant des

performances particulières de comportement au feu - Isolation mince - Partie 4: Câbles

multiconducteurs et multipaires gainés blindés ou non blindés
Ta slovenski standard je istoveten z: EN 50306-4:2020
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
29.060.20 Kabli Cables
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST EN 50306-4:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 50306-4:2020
---------------------- Page: 2 ----------------------
SIST EN 50306-4:2020
EUROPEAN STANDARD EN 50306-4
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2020

ICS 13.220.40; 29.060.20; 45.060.01 Supersedes EN 50306-4:2002 and all of its amendments

and corrigenda (if any)
English Version
Railway applications - Railway rolling stock cables having
special fire performance - Thin wall - Part 4: Multicore and
multipair screened or not screened sheathed cables

Applications ferroviaires - Câbles pour matériel roulant Bahnanwendungen - Kabel und Leitungen für

ferroviaire ayant des performances particulières de Schienenfahrzeuge mit verbessertem Verhalten im

comportement au feu - Isolation mince - Partie 4: Câbles Brandfall - Reduzierte Isolierwanddicken - Teil 4:

multiconducteurs et multipaires gainés blindés ou non Mehradrige und mehrpaarige Leitungen

blindés

This European Standard was approved by CENELEC on 2019-12-30. 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,

Turkey 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

© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50306-4:2020 E
---------------------- Page: 3 ----------------------
SIST EN 50306-4:2020
EN 50306-4:2020 (E)
Contents Page

European foreword ...................................................................................................................................4

Introduction ...............................................................................................................................................5

1 Scope ...............................................................................................................................................6

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

3 Terms and definitions .......................................................................................................................7

4 Multicore cables - sheathed .............................................................................................................7

4.1 General ...................................................................................................................................7

4.2 Marking and code designation ...............................................................................................7

4.2.1 Marking of cable .............................................................................................................7

4.2.2 Code Designation ...........................................................................................................8

4.2.3 Marking on the insulation of cores .................................................................................8

4.3 Rated voltage .........................................................................................................................8

4.4 Construction ...........................................................................................................................8

4.4.1 Cores ..............................................................................................................................8

4.4.2 Laying-up of cores ..........................................................................................................8

4.4.3 Sheath ............................................................................................................................8

5 Tests .............................................................................................................................................. 10

5.1 Definitions relating to tests .................................................................................................. 10

5.2 Voltage test on cable ........................................................................................................... 10

5.3 Tests at low temperature ..................................................................................................... 10

5.4 Ozone resistance of sheath ................................................................................................. 11

5.5 Compatibility ........................................................................................................................ 11

5.6 Fire performance ................................................................................................................. 12

6 Multicore cables - screened and sheathed ................................................................................... 13

6.1 General ................................................................................................................................ 13

6.2 Designation, marking and coding ........................................................................................ 13

6.2.1 Marking of cable .......................................................................................................... 13

6.2.2 Marking on the insulation of cores .............................................................................. 14

6.3 Rated voltage ...................................................................................................................... 14

6.4 Construction ........................................................................................................................ 14

6.4.1 Cores ........................................................................................................................... 14

6.4.2 Laying-up of cores ....................................................................................................... 14

6.4.3 Metallic braid screening ............................................................................................... 14

6.4.4 Sheath ......................................................................................................................... 15

7 Tests .............................................................................................................................................. 16

7.1 Definitions relating to tests .................................................................................................. 16

7.2 Voltage test on cable ........................................................................................................... 16

7.3 Spark test on the sheath ...................................................................................................... 17

7.4 Tests at low temperature ..................................................................................................... 17

7.5 Ozone resistance ................................................................................................................. 17

7.6 Fire performance ................................................................................................................. 18

8 Multipair cables - individually screened and sheathed and with an overall sheath....................... 19

8.1 General ................................................................................................................................ 19

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SIST EN 50306-4:2020
EN 50306-4:2020 (E)

8.2 Designation, marking and coding ........................................................................................ 19

8.2.1 Marking of the cable .................................................................................................... 19

8.2.2 Marking on the insulation of cores .............................................................................. 20

8.2.3 Marking on the sheath of the pair ................................................................................ 20

8.3 Rated voltage ...................................................................................................................... 20

8.4 Construction ........................................................................................................................ 20

8.4.1 Pairs ............................................................................................................................ 20

8.4.2 Laying-up of pairs ........................................................................................................ 20

9 Tests .............................................................................................................................................. 21

9.1 Definitions relating to tests .................................................................................................. 21

9.2 Voltage test .......................................................................................................................... 22

10 Multipair cables – general screened and sheathed ...................................................................... 23

10.1 General ................................................................................................................................ 23

10.2 Designation, marking and coding ........................................................................................ 23

10.2.1 Marking of cable .......................................................................................................... 23

10.2.2 Marking on the insulation of cores .............................................................................. 24

10.3 Rated voltage ...................................................................................................................... 24

10.4 Construction ........................................................................................................................ 24

10.4.1 Pairs ............................................................................................................................ 24

10.4.2 Laying-up of pairs ........................................................................................................ 24

10.4.3 Metallic braid screening ............................................................................................... 24

10.4.4 Outer sheath of the cable ............................................................................................ 25

11 Tests .............................................................................................................................................. 26

11.1 Definitions relating to tests .................................................................................................. 26

11.2 Voltage test - core to screen................................................................................................ 26

Annex A (informative) Guidance on selection of cables for type approval ........................................... 29

Bibliography ........................................................................................................................................... 30

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SIST EN 50306-4:2020
EN 50306-4:2020 (E)
European foreword

This document (EN 50306-4:2020) has been prepared by CLC/TC 20, “Electric cables.

The following dates are fixed:
• latest date by which this document has (dop) 2020-12-30
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2022-12-30
standards conflicting with this document
have to be withdrawn

This document supersedes EN 50306-4:2002 and all of its amendments and corrigenda (if any).

This edition includes the following significant technical changes with respect to the previous edition:

— The documents have been updated to reflect the changes in the test standard EN 50305;

— The range of the conductor cross sections has been extended;
— The reference to cited standards (e.g. EN 60811 series) has been updated.

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.

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SIST EN 50306-4:2020
EN 50306-4:2020 (E)
Introduction

The EN 50306 series covers a range of sheathed and unsheathed cables with thin wall thickness

insulation, based on halogen-free materials, for use in railway rolling stock. It is divided into four parts:

Part 1: General requirements;
Part 2: Single core cables;
Part 3: Single core and multicore cables screened and thin wall sheathed;
Part 4: Multicore and multipair screened or not screened sheathed cables.

Special test methods referred to in the EN 50306 series are given in EN 50305. A guide to use is

given in EN 50355 and rules for installation are given in EN 50343.

EN 50306-1:2020, General requirements, contains a more extensive introduction to the EN 50306

series and should be read in conjunction with this document.
---------------------- Page: 7 ----------------------
SIST EN 50306-4:2020
EN 50306-4:2020 (E)
1 Scope

This document specifies requirements for, and constructions and dimensions of, multicore and

multipair cables rated voltage U /U: 300/500 V, of the following types:
2 2

— unscreened, sheathed for either exposed or protected wiring (0,5 mm to 2,5 mm , number of

cores from 2 to 48);
2 2
to 2,5 mm , number of cores
— screened, sheathed for either exposed or protected wiring (0,5 mm
from 2 to 8);
2 2
to 1,5 mm , number of
— unscreened, sheathed for either exposed or protected wiring (0,5 mm
screened pairs of cores from 2 to 7).
2 2
to 1,5 mm , number of
— screened, sheathed for either exposed or protected wiring (0,5 mm
unscreened pairs of cores from 2 to 7).

All cables have stranded tinned copper conductors, halogen-free, thin wall thickness insulation and

standard wall thickness sheath. Cable types are specified for use in exposed situations (Class E), and

for protected situations (Class P). They are for use in railway rolling stock as fixed wiring or wiring

where limited flexing in operation is encountered.

These cables are rated for occasional thermal stresses causing ageing equivalent to continuous

operational life at a temperature of 90 °C. For standard cables this is determined by the acceptance

test defined in EN 50305, using accelerated long-term (5 000 h) thermal ageing indicating a

110 °C/20 000 h temperature index. If the customer were to require lifetime predictions this would be

demonstrated based on the temperature index of the product as supplied by the manufacturer.

The maximum temperature for short circuit conditions is 160 °C based on duration of 5 s.

Under fire conditions the cables exhibit special performance characteristics in respect of maximum

permissible flame propagation (flame spread) and maximum permissible emission of smoke and toxic

gases. These requirements are specified to permit the cables to satisfy Hazard Level 3 of EN 45545-1

and EN 45545-2.

EN 50306-4:2020 is expected to be used in conjunction with EN 50306-1:2020, General requirements,

EN 50306-2:2020, Single core cables, and EN 50306-3:2020, Single core and multicore cables.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.

EN 45545-1, Railway applications - Fire protection on railway vehicles - Part 1: General

EN 50264-1:2008, Railway applications - Railway rolling stock power and control cables having

special fire performance - Part 1: General requirements

EN 50305:2020, Railway applications - Railway rolling stock cables having special fire performance -

Test methods

EN 50306-1:2020, Railway applications - Railway rolling stock cables having special fire performance -

Thin wall - Part 1: General requirements

EN 50306-2:2020, Railway applications - Railway rolling stock cables having special fire performance -

Thin wall - Part 2: Single core cables
---------------------- Page: 8 ----------------------
SIST EN 50306-4:2020
EN 50306-4:2020 (E)

EN 50306-3:2020, Railway applications - Railway rolling stock cables having special fire performance -

Thin wall - Part 3: Single core and multicore cables screened and thin wall sheathed

EN 60332-1-2, Tests on electric and optical fibre cables under fire conditions - Part 1-2: Test for

vertical flame propagation for a single insulated wire or cable - Procedure for 1 kW pre-mixed flame

EN 60332-3-24, Tests on electric and optical fibre cables under fire conditions - Part 3-24: Test for

vertical flame spread of vertically-mounted bunched wires or cables - Category C

EN 61034-2, Measurement of smoke density of cables burning under defined conditions - Part 2: Test

procedure and requirements

EN 60811 (all parts), Electric and optical fibre cables - Test methods for non-metallic materials

3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISOOnline browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Multicore cables - sheathed
4.1 General

The completed cables shall conform to the applicable general requirements given in EN 50306-1:2020

and to the specific requirements of Clause 4 and Clause 5.

Conformity with the requirements shall be checked by inspection and by the tests given in Table 2.

4.2 Marking and code designation
4.2.1 Marking of cable
Cables shall be marked with the following:
— Manufacturer's name;
— EN reference;
— table number;
— cable class (P or E);
— Voltage rating (U0);
— No. of cores and conductor size;
— A code designation according for use of the cable (see 4.2.2);
— Conductor temperature rating
For example:
---------------------- Page: 9 ----------------------
SIST EN 50306-4:2020
EN 50306-4:2020 (E)
XYZ EN 50306-4 1E 300 V 2x1,5 MM 90
The marking shall conform to the requirements of EN 50306-1:2020, Clause 5.
4.2.2 Code Designation

The following letters shall be used as a code to identify the suitability of a particular cable for use

under one of the Hazard Levels of EN 45545-1, and to indicate performance levels relating to low

temperature and to oil and fuel resistance:
Hazard Level EN 45545-1 HL3
— low temperature / oil resistance C
— extra low temperature / oil resistance F
— low temperature / extra oil and fuel resistance J
— extra low temperature / extra oil and fuel resistance M

For sheathed cables two letters are required, one for the insulation and one for the sheath

4.2.3 Marking on the insulation of cores

The cores shall be marked 1, 2, etc., in accordance with the requirements, given in EN 50306-2:2020,

4.3.2.

However, the core number one may be marked as the relevant single core in accordance with the

requirements of EN 50306-2:2020, 4.3.2.
Durability of marking shall be in accordance with EN 50305:2020, 10.1.
4.3 Rated voltage

The rated voltage recognized for the purposes of this standard shall be U0/U = 300V / 500V

NOTE See EN 50355 and 50343 for further information.
4.4 Construction
4.4.1 Cores

Each insulated single core shall conform to the requirements given in EN 50306-2:2020.

4.4.2 Laying-up of cores
The cores shall be twisted together.

The pitch of lay for the cores shall not be greater than 20 times the diameter of the laid-up cores in the

cable.
4.4.3 Sheath

The sheath shall be a compound of type EM 101 to EM 104, and shall be applied by extrusion.

Compounds type EM 101 to EM 104 together with their requirements are defined in EN 50264-1.

The sheath material from the finished cable shall be tested in accordance with the requirements given

in EN 50264-1:2008, Table 4.

The sheath shall be smooth and uniformly applied; the application shall ensure that cables with a class

E sheath are substantially circular. The thickness of sheath shall conform to the specified value given

in Table 1 according to the class.
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SIST EN 50306-4:2020
EN 50306-4:2020 (E)
The sheath colour shall be black, unless otherwise specified.
Table 1 — Requirements for construction of multicore cables - sheathed
1 2 3 4 5 6 7
Number of Cables class E Cables class P
cores and
nominal
cross-section
of the
conductor
Average Overall diameter Minimum Overall diameter
minimum thickness
thickness of sheath at
of sheath any point
min. max. min. max.
mm mm mm mm mm mm mm
2 × 0,5 1,0 4,9 5,9 0,42 3,5 4,5
3 × 0,5 1,0 5,1 6,1 0,42 3,8 4,8
4 × 0,5 1,0 5,5 6,5 0,42 4,1 5,3
7 × 0,5 1,0 6,3 7,3 0,42 4,9 6,1
13 × 0,5 1,0 8,3 9,3 0,56 7,3 8,5
19 × 0,5 1,0 9,0 10,2 0,56 8,1 9,3
37 × 0,5 1,0 12,3 13,5 0,56 10,8 12,2
2 × 0,75 1,0 5,3 6,3 0,42 4,0 5,0
3 × 0,75 1,0 5,5 6,5 0,42 4,2 5,2
4 × 0,75 1,0 6,0 7,0 0,42 4,6 5,8
7 × 0,75 1,0 6,9 7,9 0,42 5,5 6,6
13 × 0,75 1,0 9,1 10,3 0,56 8,2 9,4
19 × 0,75 1,0 10,0 11,2 0,56 9,0 10,4
37 × 0,75 1,0 13,2 14,4 0,56 12,2 13,6
48 × 0,75 1,0 14,8 16,4 0,56 13,9 15,7
2 × 1,0 1,0 5,6 6,6 0,42 4,3 5,3
3 × 1,0 1,0 5,9 6,9 0,42 4,6 5,6
4 × 1,0 1,0 6,3 7,3 0,42 4,9 6,1
7 × 1,0 1,0 7,3 8,3 0,42 6,0 7,2
13 × 1,0 1,0 9,7 10,9 0,56 8,7 10,1
19 × 1,0 1,0 10,7 11,9 0,56 9,8 11,2
37 × 1,0 1,0 14,0 15,6 0,56 13,3 14,7
2 × 1,5 1,0 6,3 7,3 0,42 5,0 6,0
3 × 1,5 1,0 6,6 7,6 0,42 5,3 6,3
4 × 1,5 1,0 7,4 8,4 0,42 6,0 7,2
7 × 1,5 1,0 8,6 9,8 0,56 7,7 8,9
13 × 1,5 1,0 11,7 12,9 0,56 10,7 12,1
19 × 1,5 1,0 13,0 14,2 0,56 12, 13,4
37 × 1,5 1,0 17,2 18,8 0,56 16,2 18,
---------------------- Page: 11 ----------------------
SIST EN 50306-4:2020
EN 50306-4:2020 (E)
1 2 3 4 5 6 7
Number of Cables class E Cables class P
cores and
nominal
cross-section
of the
conductor
Average Overall diameter Minimum Overall diameter
minimum thickness
thickness of sheath at
of sheath any point
min. max. min. max.
mm mm mm mm mm mm mm
2 × 2,5 1,0 7,7 8,7 0,56 6,7 7,9
3 × 2,5 1,0 8,1 9,1 0,56 7,1 8,3
4 × 2,5 1,0 8,8 10,0 0,56 7,9 9,1

For other compositions (number of cores), sheath thicknesses shall follow in principle the value

mentioned in the Table 1 or ask the manufacturer for adequate technical design depending on the

application requirements. The cable marking shall keep the standard name as EN 50306-4:2020.

5 Tests
5.1 Definitions relating to tests

The definition of Type (T), Sample (S) and Routine (R) tests is as given in EN 50306-1:2020,

Clause 3.

NOTE 1 Tests classified as Sample (S) or Routine (R) could be required as part of any approval schemes.

NOTE 2 Annex A gives guidance on the selection of cables for type approval.
5.2 Voltage test on cable

The test shall be carried out in accordance with EN 50305:2020, 6.2.1, using an AC or DC voltage and

the following conditions:
— sample length 20 m
— voltage (AC) 2 kV
— voltage (DC) 4,8 kV
— duration of application 5 min
— test temperature (20 ± 5) °C
At the conclusion of the test there shall be no breakdown of the insulation.
5.3 Tests at low temperature
a) Bending test for cable diameter ≤ 12,5mm
The test shall be carried out at (- 40 ± 2) °C in accordance with EN 60811-504.
At the conclusion of the test there shall be no cracks in the sheath.
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SIST EN 50306-4:2020
EN 50306-4:2020 (E)

Where cables sheaths are not to be used at extra low temperature, the test may be carried out at

(- 25 ± 2) °C.
b) Elongation test for cable diameter > 12,5mm
The test shall be carried out at (- 40 ± 2) °C in accordance with EN 60811-505.
The elongation of the sheath shall be not less than 30 %.

Where cables sheaths are not to be used at extra low temperatures, the test may be carried out at

(- 25 ± 2) °C.
c) Impact

The test shall be carried out at (- 25 ± 2) °C in accordance with EN 50305:2020, 5.1.

At the conclusion of the test there shall be no cracks in the inside or the outside of the sheath, nor on

the outside of the insulation.
5.4 Ozone resistance of sheath

The test shall be carried out either in accordance with EN 60811-403 (for Method A) or

EN 50305:2020, 7.4.2, (for Method B), using the following conditions:
The choice of Method A or Method B may be made by the supplier.
Method A:
concentration (%) (250 to 300) × 10
test temperature (25 ± 2) °C
test duration 24 h
test requirements no cracks
Method B:
concentration (%) (200 ± 50) × 10
test temperature (40 ± 2) °C
relative humidity (%) 55 ± 5
test duration 72 h
test requirements no cracks
5.5 Compatibility

The test shall be carried out in accordance with EN 50305:2020, 7.1. Cable shall be aged for 7 days at

the following temperatures:
(100 ± 2) °C for cables with a designated operating temperature of 90 °C;
Test requirement:
— tensile strength variation ± 30 % maximum
— elongation at break variation ± 30 % maximum
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SIST EN 50306-4:2020
EN 50306-4:2020 (E)
5.6 Fire performance

The completed cable shall conform to the requirements given in EN 50306-1:2020, 8.1, 8.2.1, 8.2.2 or

8.2.3 (depending upon overall diameter) and 8.3.
The sheath shall conform to the requirements of EN 50306-1:2020, Clause 9.
Table 2 — Schedule of tests for multicore cables - sheathed
1 2 3 4 5 6
Ref Test Catego-ry Test method given in Requirement
No of test given in
EN (Sub)clause
1 Electrical tests
1.1 Electrical resistance of conductors T, S EN 50305:2020 6.1 Table 1 of EN
50306-2:2020
1.2 Voltage test on complete cable T, S EN 50305:2020 6.2.1 5.2
2 Provisions covering constructional and
dimensional characteristics

2.1 Checking of conformity and constructional T, S EN 50306-1 Inspection 3.4 and Clause 6 of

provisions EN 50306-1:2020
2.2 Sheath:
(a) Application S EN 50306-1 Inspection and 6.6.2 of
manual test EN 50306-1:2020
(b) Thickness T, S EN 50306-1 A.2 Table 1
2.3 Overall diameter T, S EN 50306-1 6.7 Table 1
2.4 Identification and marking T, S EN 50306-4 Inspection and 4.2.1 and 4.2.3
measurement
2.5 Durability of identification T, S EN 50305:2020 10.1 5.3 of
EN 50306-1:2020
3 Tests of sheath material
3.1 Mechanical properties of sheath in state as T, S EN 60811-501 9.2 Table 4 of
delivered EN 50264-1:2008
3.2 Tests at low temperature
Bending (diameter ≤ 12,5 mm) T EN 60811-504 8.2 5.3(a)
Elongation (diameter > 12,5 mm) T EN 60811-505 8.4 5.3(b)
Impact resistance T EN 50305:2020 5.1 5.3(c)
3.3 Ozone resistance T EN 50305:2020 7.4.2 5.4
3.4 Water absorption (Gravimetric) T EN 60811-402 Table 4 of
EN 50264-1:2008
3.5 Compatibility test T EN 50305:2020 7.1 5.5
4 Fire performance
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SIST EN 50306-4:2020
EN 50306-4:2020 (E)
1 2 3 4 5 6
Ref Test Catego-ry Test method given in Requirement
No of test given in
EN (Sub)clause
4.1 Flame propaga
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