Railway applications - Railway rolling stock cables having special fire performance - Test methods

This standard specifies special test methods applicable to cables, and their constituent insulating and sheathing materials, for use in railway rolling stock.  Such cables are specified in the various parts of EN 50264 and EN 50306.
Other test methods required for railway rolling stock cables and their insulating and sheathing materials are listed in Annex A.

Bahnanwendungen - Kabel und Leitungen für Schienenfahrzeuge mit verbessertem Verhalten im Brandfall - Prüfverfahren

Diese Norm legt besondere Prüfverfahren für Kabel und Leitungen und die dazugehörigen Isolier- und Mantelwerkstoffe fest, die für die Verwendung in Schienenfahrzeugen bestimmt sind. Diese Kabel und Leitungen sind in den verschiedenen Teilen der EN 50264 und EN 50306 genormt.
Weitere Prüfverfahren für Kabel und Leitungen für Schienefahrzeuge und ihre Isolier- und Mantelwerkstoffe sind in Anhang A auf¬geführt.

Applications ferroviaires - Câbles pour matériel roulant ferroviaire ayant des performances particulières de comportement au feu - Méthodes d'essais

La présente norme définit les méthodes d'essais spéciaux concernant les câbles et leurs matériels d'isolation et de gainage constitutifs, utilisés dans le matériel roulant ferroviaire. Ces câbles sont spécifiés dans les différentes parties des normes EN 50264 et EN 50306.
D'autres méthodes d'essais intéressant les câbles de matériel roulant ferroviaire et leurs matériels d'isolation et de gainage correspondants sont indiquées en Annexe A.

Railway applications - Railway rolling stock cables having special fire performance - Test methods

General Information

Status
Withdrawn
Publication Date
31-Oct-2002
Withdrawal Date
05-Jan-2023
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
06-Jan-2023
Due Date
29-Jan-2023
Completion Date
06-Jan-2023

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SLOVENSKI STANDARD
SIST EN 50305:2002
01-november-2002
Railway applications - Railway rolling stock cables having special fire performance
- Test methods
Railway applications - Railway rolling stock cables having special fire performance - Test
methods
Bahnanwendungen - Kabel und Leitungen für Schienenfahrzeuge mit verbessertem
Verhalten im Brandfall - Prüfverfahren
Applications ferroviaires - Câbles pour matériel roulant ferroviaire ayant des
performances particulières de comportement au feu - Méthodes d'essais
Ta slovenski standard je istoveten z: EN 50305:2002
ICS:
13.220.20 3RåDUQD]DãþLWD Fire protection
29.060.20 Kabli Cables
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
SIST EN 50305:2002 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50305:2002

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SIST EN 50305:2002
EUROPEAN STANDARD EN 50305
NORME EUROPÉENNE
EUROPÄISCHE NORM July 2002
ICS 13.220.20; 29.060.20; 45.060.01
English version
Railway applications -
Railway rolling stock cables having special fire performance -
Test methods
Applications ferroviaires - Bahnanwendungen -
Câbles pour matériel roulant ferroviaire Kabel und Leitungen für Schienenfahrzeuge
ayant des performances particulières mit verbessertem Verhalten im Brandfall -
de comportement au feu - Prüfverfahren
Méthodes d'essais
This European Standard was approved by CENELEC on 2002-07-02. 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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, 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
© 2002 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50305:2002 E

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SIST EN 50305:2002
EN 50305:2002 – 2 –
Foreword
This European Standard was prepared for the Technical Committee CENELEC TC 20, Electric cables
by WG 12, Railway cables, on behalf of the Technical Committee CENELEC TC 9X, Electrical and
electronic applications for railways.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50305 on 2002-07-02.
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) 2003-07-01
- latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-07-01
Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes B and E are normative and annexes A, C and D are informative.
__________

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SIST EN 50305:2002
– 3 – EN 50305:2002
Contents
Introduction.5
1 Scope.6
2 Normative references.6
3 Definitions.7
4 Applicability, sampling, test-piece preparation and test conditions.7
4.1 Applicable tests.7
4.2 Classification of tests .7
4.3 Sampling.7
4.4 Test-piece preparation .7
4.5 Test conditions.7
5 Mechanical tests.8
5.1 Impact test at low temperature .8
5.2 Abrasion resistance.8
5.3 Notch propagation.9
5.4 Pliability .10
5.5 Strippability and adhesion of insulation.11
5.6 Dynamic cut-through.11
6 Electrical tests.12
6.1 Electrical resistance of conductors .12
6.2 Voltage test on completed cable.12
6.3 Voltage test on sheath.12
6.4 Insulation resistance .13
6.5 Spark test .13
6.6 Surface resistance .14
6.7 D.C. stability .14
6.8 Dielectric strength .15
7 Ageing and thermal tests.15
7.1 Compatibility .15
7.2 Long term ageing for insulation .15
7.3 Long term ageing for sheath.19
7.4 Ozone resistance.19
7.5 Pressure test at high temperature .21
7.6 Shrinkage test for insulation .21
7.7 Stress cracking test.21
8 Tests in fluids, including water.23
8.1 Mineral and fuel oil resistance .23
8.2 Acid and alkali resistance.23
8.3 Water absorption of sheath .23
9 Reaction to fire tests .24
9.1 Flame propagation.24
9.2 Toxicity .24
10 Miscellaneous tests.27
10.1 Durability of marking .27
10.2 Blocking of cores.27

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SIST EN 50305:2002
EN 50305:2002 – 4 –
Annex A (informative) List of other test methods applicable to rolling stock cables .29
Annex B (normative) Procedure for checking the efficacy of the method of spark testing (with
reference to 6.5) .30
Annex C (informative) Long term ageing test – Significance and use.32
Annex D (informative) Illustration of an Arrhenius plot.33
Annex E (normative) Analysis methods for toxicity .34
Figure 1 – Test arrangement for abrasion of insulation and sheath.9
Figure 2 – Pliability test rig .10
Figure 3 – Assembly for adhesion test.11
Figure 4 – Arrangement of electrodes for test sample.14
Figure 5 – Suggested method of attachment of insulated wire test specimen to mandrel .18
Figure 6 – Clamping device.20
Figure 7 – Flat topped cone .22
Figure 8 – Schematic diagram of apparatus for production, collection and analysis of gases.26
Figure B.1 – Removal of insulation segment.30
Figure B.2 – Overlap position for tape .31
Table 1 – Tolerances for temperature values.7
Table 2 – Parameters for impact test at low temperature.8
Table 3 – Recommended exposure times in days per cycle.17
Table 4 – Requirements for wrapping test .17
Table 5 – Determination method to be applied .25
Table 6 – CC values for various gases .27
z

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SIST EN 50305:2002
– 5 – EN 50305:2002
Introduction
The railway industry is generally concerned with the movement of people as well as goods. It is
therefore essential that a high level of safety is achieved, even when failures occur which may involve
fire, howsoever caused, affecting railway rolling stock.
Hence it is necessary to provide cables for use in railway environments which minimise the hazard to
people when a fire may damage the cable, irrespective of whether the fire is caused by an external
source or from within the electrical system.
European Standards EN 50264 and EN 50306 specify cables which, in the event of fire will limit risk to
people and improve the safety on railways in general. They cover cables based on halogen free
materials, for use in railway rolling stock.
EN 50264 covers a range of sheathed and unsheathed cables, with standard wall thickness of
2 2
insulation, rated at up to 3,6/6 kV with conductor sizes 1,0 mm up to 400 mm .
EN 50306 covers a range of sheathed and unsheathed cables with thin wall insulation, and restricted
2
to a rating of 300 V to earth and a maximum conductor size of 2,5 mm .
This standard EN 50305, gives particular test methods applicable to the cables at present covered by
EN 50264 and EN 50306.

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SIST EN 50305:2002
EN 50305:2002 – 6 –
1 Scope
This standard specifies special test methods applicable to cables, and their constituent insulating and
sheathing materials, for use in railway rolling stock. Such cables are specified in the various parts of
EN 50264 and EN 50306.
Other test methods required for railway rolling stock cables and their insulating and sheathing
materials are listed in Annex A.
2 Normative references
This European Standard incorporates 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 undated references the latest edition of the publication referred to applies (including
amendments).
EN 50264-1 Railway applications - Railway rolling stock cables having special fire
performance - Standard wall -- Part 1: General requirements
EN 50266-2-4:2001 Common test methods for cables under fire conditions - Test for vertical flame
spread of vertically-mounted bunched wires or cables -- Part 2-4: Procedures -
Category C
EN 50267-1 Common test methods for cables under fire conditions – Test on gases evolved
during combustion of materials from cables -- Part 1: Apparatus
EN 50306-1 Railway applications - Railway rolling stock cables having special fire
performance - Thin wall -- Part 1: General requirements
EN 60216-1 Electrical insulating materials - Properties of thermal endurance -- Part 1:
Ageing procedures and evaluation of test results (IEC 60216-1)
EN 60811-1-1 Insulating and sheathing materials of electric cables - Common test methods --
Part 1-1: General application - Measurement of thickness and overall
dimensions - Tests for determining the mechanical properties (IEC 60811-1-1)
EN 60811-1-2 Insulating and sheathing materials of electric cables - Common test methods --
Part 1-2: General application - Thermal ageing methods (IEC 60811-1-2)
EN 60811-1-3 Insulating and sheathing materials of electric cables - Common test methods --
Part 1-3: General application - Methods for determining the density - Water
absorption tests - Shrinkage test (IEC 60811-1-3)
EN 60811-1-4 Insulating and sheathing materials of electric cables - Common test methods --
Part 1-4: General application - Test at low temperature (IEC 60811-1-4)
EN 60811-3-1 Insulating and sheathing materials of electric cables - Common test methods --
Part 3-1: Methods specific to PVC compounds - Pressure test at high
temperature - Tests for resistance to cracking (IEC 60811-3-1)
ISO 6349 Gas analysis - Preparation of calibration gas mixtures - Permeation method
ISO 8458-2 Steel wire for mechanical springs -- Part 2: Cold-drawn carbon steel wire

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SIST EN 50305:2002
– 7 – EN 50305:2002
3 Definitions
The definitions given in EN 50264-1 and EN 50306-1, shall apply to this standard.
4 Applicability, sampling, test-piece preparation and test conditions
4.1 Applicable tests
Tests applicable to each type of cable are given in the particular cable standard.
4.2 Classification of tests
The classification of tests is given in the general requirements of the relevant cable standard.
4.3 Sampling
The size and number of samples for each particular test is given either in this EN or the relevant cable
standard.
4.4 Test-piece preparation
The preparation of test pieces shall be as described in the particular test method or in the cable
standard.
NOTE  Attention is drawn to the fact that some insulation systems used for railway cables are composites (multilayer). In such
cases special preparation techniques and requirements are given in the particular cable standard.
4.5 Test conditions
4.5.1 Ambient temperature
Tests shall be made at an ambient temperature within the range 5 °C to 35 °C, unless otherwise
specified in the details for the particular test.
4.5.2 Tolerance on temperature values
The tolerances which shall apply to the temperature values are given in Table 1.
Table 1 – Tolerances for temperature values
Specified Tolerance
temperature (T)
°C °C
-40 � T � 0 � 2
According to
0 < T � 50
relevant clause
50 < T � 150 � 2
T > 150 � 3
4.5.3 Frequency and waveform of power frequency test voltages
Unless otherwise specified, the test voltage shall be a.c. 49 Hz to 61 Hz of approximately sine-wave
form; the ratio peak value/r.m.s. value being equal to �2 with a tolerance of � 7 %.
The values quoted are r.m.s. values.

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SIST EN 50305:2002
EN 50305:2002 – 8 –
4.5.4 Pre-conditioning
Unless otherwise stated the tests shall be carried out not less than 16 h after the extrusion or cross-
linking, if any, of the insulating or sheathing compounds.
5 Mechanical tests
5.1 Impact test at low temperature
The impact test in accordance with 8.5 of EN 60811-1-4 shall be used except that the mass of
hammer, intermediate test piece and height of drop shall be as given in Table 2.
Table 2 – Parameters for impact test at low temperature
Cable Mass of Mass of intermediate Height of
diameter (D) hammer test piece drop
mm g g mm
1 000 200 100
D � 15
1 500 200 150
15 < D � 25
D > 25 2 000 200 200
The inside and outside of the sheath and the insulation of unsheathed cables shall then be examined
with normal or corrected vision, without magnification. The insulation of sheathed cables shall be
examined on the outside only.
5.2 Abrasion resistance
The test shall be carried out at a temperature of (20 � 5) °C, using a machine similar to that shown in
Figure 1.
The cutting edge shall be either a polished steel spring wire needle of (0,45 ± 0,01) mm diameter, and
of material according to ISO 8458-2, held in a suitable support (Figure 1 b)), or a rectangular shaped
steel blade (Figure 1 a)) mounted at 90° to the axis of the cable. The setting shall be arranged so as
to wear the surface of the core or cable lengthwise over a distance of 10 mm to 20 mm, with a
frequency of (55 � 5) cycles per minute. The machine shall be fitted with a counter which shall stop
automatically when the cutting edge touches the conductor or electrical screen.
For cables of diameter less than or equal to 6 mm the needle shall be used, and for cables with
diameter greater than 6 mm the steel blade shall be used, unless otherwise specified in the particular
cable standard.
The load on the cutting edge shall be defined in the cable standard.
The test specimen shall consist of a single 0,75 m sample of core or cable.
The test specimen shall be held securely on the plate by 2 cable clamps.
Each test specimen shall undergo four tests. After each single test it shall be moved approximately
100 mm and turned by a 90° angle, clockwise.
NOTE  In the case of 2 core cables, 3 core cable or those cables not substantially circular, the cutting edge should be applied
to the highest points on the circumference of the cable.
Each test is finished when the cutting edge touches the conductor or electrical screen.

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SIST EN 50305:2002
– 9 – EN 50305:2002
The measure of abrasion resistance shall be the average value of the number of cycles in the four
tests.
a) Detail X b) Detail Y
(edges not rounded; free of burr)
Dimensions in millimetres
Key
1 Stroke generator 7 Fastening screw
2 Stroke 8 Blade reamer
3 Loading weight 9 Shoulder of sufficient depth
to clear insulation
4Clamp
5 Test specimen 10 Cutting edge - needle
6 Supporting plate 11 Cable under test
Figure 1 – Test arrangement for abrasion of insulation and sheath
5.3 Notch propagation
Three samples of the cable shall be notched, to a depth of 0,05 mm of the insulation or sheathing, at
four points equally spaced with respect to one another around the circumference and 25 mm apart
along the length, and in a plane mutually perpendicular to the conductor.
NOTE  In the case of 2 core cable, 3 core cable or those cables not substantially circular, the notches should be made at the
highest points on the circumference of the cable.

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SIST EN 50305:2002
EN 50305:2002 – 10 –
One of the samples shall be conditioned at -15 °C, one at ambient temperature and one at 85 °C, in all
cases for 3 h, after which time they shall be wound on to a mandrel, (3 ± 0,3) times the minimum
specified diameter of the cable, whilst at the conditioning temperature. The notched sample shall be
wrapped around the mandrel such that at least one notch is on the outside of the cable.
The sample shall be allowed to return to ambient temperature and then subjected to the voltage test
given in 6.2. but at half the rated voltage U .
0
5.4 Pliability
From a single coil of cable cut consecutive test specimen lengths, each of approximately 200 mm.
Suspend each specimen vertically for 24 h in an oven with a mass attached to its free end. The
applied mass and oven temperature shall be as stated in the cable specification. Immediately after
removal from the oven, store the specimens at the temperature, relative humidity and period of time
specified in the cable specification.
Test each specimen using the test rig shown in Figure 2; the diameter of the mandrel in the test rig
shall be as the minimum bend diameter unless specified in the cable specification. Gradually apply a
mass to the cable, at the position shown in Figure 2, sufficient to bend the cable downwards through
0
(90 )°.
-1
Ensure that the specimen remains in this position for 5 min and record the mass. After this time,
remove the mass and allow the specimen to recoil towards its original position. At a time 5 min after
removal of the mass, record the recoil distance.
Dimensions in millimetres
Key
1Clamp
2 Mandrel
3 Test specimen
4 Mass container
5 Recoil
Figure 2 – Pliability test rig

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SIST EN 50305:2002
– 11 – EN 50305:2002
5.5 Strippability and adhesion of insulation
5.5.1 Strippability
Stripping of 5 mm of insulation from each end of a 50 mm sample shall be easily carried out with
normal stripping pliers.
5.5.2 Adhesion
Three test specimens, each of 50 mm length, shall be cut at regular intervals from a test sample of
3 m of core or cable.
On each specimen the insulation shall be cut 5 mm and 30 mm from one end. The insulation shall be
stripped from the cuts to each end, so that insulation is left intact in-between the two cuts. The core
shall then be passed through a calibrated hole the diameter of which is that of the core + 0,05 mm
(see Figure 3).
Using a pulling speed of (100 � 10) mm/min a force shall be applied to the conductor until it slips
inside the insulation. The force (F) required to produce the slippage shall be recorded.
Dimensions in millimetres
Figure 3 – Assembly for adhesion test
5.6 Dynamic cut-through
A tensile tester (or equivalent apparatus) shall be operated in a compression mode and shall be
equipped with a means to record the force necessary to drive the needle cutting edge (see
Figure 1 b)) through the insulation or sheath of a finished sample of cable. A low voltage detection
circuit, designed to stop the tester when the edge cuts through the cable insulation or sheath and
contacts the conductor or electrical screen, shall be attached.
Carry out the test at the temperature specified in the individual cable specification. The force on the
cutting edge driving it through the insulation or sheath shall be increased at the constant rate as
specified in the product standard until contact with the conductor or metallic screen occurs. Perform
four tests on each test sample, and record the force measured at electrical contact. Move the sample
forward a minimum of 25 mm and rotate 90° clockwise between each test.
NOTE  In the case of 2 core cables, 3 core cable or those cables not substantially circular, the cutting edge should be applied
to the highest points on the circumference of the cable.
The average of the four results shall not be less than the specified minimum.

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SIST EN 50305:2002
EN 50305:2002 – 12 –
6 Electrical tests
6.1 Electrical resistance of conductors
The electrical resistance of each conductor shall be measured on a sample of cable of at least 1 m in
length, and the length of this sample shall be measured.
If necessary a correction to 20 °C and to a length of 1 km shall be obtained by the formula:
254,5 1000
RR�� �
20 t
234,5� t L
where
t = temperature of the sample at the moment of measurement, in degrees Celsius;
R = resistance at 20 °C, in ohm/kilometre;
20
R = resistance of L metres of cable at t °C in ohm;
t
L = length of the sample of cable, in metres (length of the complete sample and not of the
individual cores or wires)
The measured resistance shall not exceed the value in the particular standard.
6.2 Voltage test on completed cable
6.2.1 Cable without metallic layer
If the cable has no metallic layer, a sample of the cable as delivered shall be immersed in water for a
minimum period of 1 h. The length of the sample, the temperature of the water and the duration of
application of voltage shall be as given in the cable specification.
A voltage shall be applied in turn between each conductor and all the others connected together and to
the water.
6.2.2 Cable with one or more metallic layers
a) If the cable has a metallic layer, a sample of the cable shall be taken of the length defined in the
cable specification.
A voltage shall be applied in turn between each conductor and all the others connected together
and to the metallic layer.
The voltage and the duration of its application are given for each case in the cable specification.

b) If the cable has more than one screened and sheathed unit a sample of the complete cable shall
be taken of the length defined in the cable specification.
A voltage shall be applied in turn between each screen and all other screens and conductors
connected together.
The voltage and the duration of its application are given for each case in the cable specification.
6.3 Voltage test on sheath
The test shall be made on sheathed cable where there is a metallic screen or braid under the sheath.
A length of complete cable shall be immersed in water, and an a.c. or a d.c. voltage applied between the
metallic screen or braid and the water.
The sample length, test temperature, voltage level and duration of its application shall be as given in the
particular cable standard.

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SIST EN 50305:2002
– 13 – EN 50305:2002
6.4 Insulation resistance
6.4.1 Test at ambient temperature
The test shall be made on the core samples, 5 m long, previously submitted to the test described in 6.2.1.
The sample shall be immersed in water at ambient temperature; a length about 0,25 m at each end of
the sample being kept above the water. The duration of immersion shall be a minimum of 1 h.
A d.c. voltage of between 80 V and 500 V shall be then applied between the conductor and the water.
The insulation resistance shall be measured one minute after application of the voltage and this value
shall be corrected to 20 °C and related to 1 km.
6.4.2 Test at elevated temperature
The test shall be made on the core samples, 5 m long.
The sample shall be immersed in water previously heated to 90 °C; a length of about 0,25 m at each
end of the sample being kept above the water. The duration of immersion shall be a minimum of 1 h.
A d.c. voltage of between 80 V and 500 V shall then be applied between the conductor and the water.
The insulation resistance shall be measured one minute after application of the voltage and this value
shall be related to 1 km.
6.5 Spark te
...

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