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BS EN 50306-3:2020

BS EN 50306-3:2020

$102.76

Railway applications. Railway rolling stock cables having special fire performance. Thin wall – Single core and multicore cables screened and thin wall sheathed

Published By Publication Date Number of Pages
BSI 2020 20
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This document specifies requirements for, and constructions and dimensions of, multicore cables, rated voltage U0/U = 300/500 V, of the following type:

Screened (0,5 mm2 to 2,5 mm2, number of cores from 1 to 8).

All cables have stranded tinned copper conductors, and thin wall thickness, halogen-free, insulation and sheath. 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 50306-3:2020 is expected to be used in conjunction with EN 50306-1:2020, General Requirements, and EN 50306-2:2020, Single core cables.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 1 Scope
2 Normative references
3 Terms and definitions
8 4 Single and multicore screened cables
4.1 General
4.2 Marking and code designation
4.2.1 Marking of cable
4.2.2 Code Designation
9 4.2.3 Marking on the insulation of cores for multi core cables
4.3 Rated voltage
4.4 Construction
4.4.1 Cores
4.4.2 Laying-up of cores in multicore cables
4.4.3 Metallic braid screening
10 4.4.4 Sheath
11 5 Tests
5.1 Definitions relating to tests
5.2 Voltage test
5.3 Voltage test on sheath
5.4 Spark test on the sheath
12 5.5 Water absorption of sheath
5.6 Hot set test of sheath
5.7 Ageing test of sheath
5.8 Mineral oil resistance of sheath
13 5.9 Fuel resistance of sheath
5.10 Acid and alkali resistance of sheath
14 5.11 Pressure test at high temperature
5.12 Dynamic cut through
5.13 Notch propagation of sheath
5.14 Bending test at low temperature
5.15 Abrasion resistance of sheath
5.16 Ozone resistance
15 5.17 Stress cracking test
5.18 Fire performance tests
18 Annex A (informative)Guidance on selection of cables for type approval

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BS EN 50306-3:2020
$102.76