Railway rolling stock cables having special fire performance

BS EN 50306-4:2020 pdf free.Railway applications一Railway rolling stock cables having special fire performance一Thin wall Part 4: Multicore and multipair screened or not screened sheathed cables.
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 kWpre-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 – Categoty 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:I/www.isoorqlobp
— 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.
4.2.1 Marking of cable Cables shall be marked with the following:
— Manufacturer’s name:
— EN reference;
— table number:
— cable class (P or E);
— Voltage rating (Uo);
— No. of cores and conductor size;
— A code designation according for use of the cable (see 4.2.2);
— Conductor temperature rating
For example:
XYZ EN50306-41E300V2x1,5MM90
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 kientify 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 I oil resistance C
— extra low temperature I oil resistance F
— low temperature I extra oil and fuel resistance J
— extra low temperature I 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 LWU = 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 I according to the class.
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 (5) and Routine (R) tests is as given in EN 50306-1:2020, Clause 3.
NOTE 1 Tests dassifled as Sample (5) or Routine (R) could be required as part of any approval schemes.
NOTE 2 Annex A gives guidance on the selection of cables fo4’ 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 mm
— test temperature (20 i 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 accoi-dance with EN 60811-504, At the conclusion of the test there shall be no cracks in the sheath.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> 125mm 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 6081 1-403 (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.
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土2) °C for cables with a designated operating temperature of 90 °C;
Test requirement:
一tensile strength variation土30 % maximum
一elongation at break variation土30 % maximum
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.
The completed cables shall conform to the applicable general requirements given in EN 50306-1:2020 and the specific requirements of Clause 6 and Clause 7.
Conformity with the requirements shall be checked by inspection and by the tests given in Table 4.BS EN 50306-4 pdf download.Railway rolling stock cables having special fire performance