BS EN 50264-3-1 – Railway applications – Railway rolling stock power and control cables having special fire performance – Part 3-2: Cables with crosslinked elastomeric insulation with reduced dimensions – Multicore core cables.
Part of EN 50264-3-2 specifies requirements for, and constructions and dimensions of, multicore cables of the following types and voltage ratings:
- 300/500 V screened or unscreened (1 mm2, 1,5 mm2 and 2,5 mm2, number of cores from 2 to 40)
- 0,6/1 kV screened or unscreened, (1 mm2 to 50 mm2, 2, 3 and 4 core)
NOTE 1 Not all conductor sizes or number of cores are specified for every type.
All cables have class 5 tinned copper conductors to BS EN 60228, halogen-free insulation and halogen-free sheath. They are for use in railway rolling stock as fixed wiring or wiring where limited flexing in operation is encountered. The requirements provide for a continuous conductor temperature not exceeding 90 °C and a maximum temperature for short circuit conditions of 200 °C based on a duration of 5 seconds.
The cables in this part of the standard are sometimes referred to as Medium Wall, having insulation and sheath thickness less than traditional values giving reduced dimensions.
Under fire conditions the cables 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 Levels 1, 2, 3 or 4 of EN 45545-1.
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