Railway applications – High temperature power cables for railway rolling stock and having special fire performance – Part 2: Single core, silicone rubber insulated cables for 120 °C and 150 °C.

Scope

Part 2 of EN 50382 specifies requirements for, and constructions and dimensions of, single core cables of the following types and voltage ratings:

• 1,8/3 kV unscreened, unsheathed with or without textile braid (1,5 mm2 to 400 mm2)
• 1,8/3 kV unscreened, sheathed (1,5 mm2 to 400 mm2)
• 3,6/6 kV unscreened, unsheathed with or without textile braid (2,5 mm2 to 400 mm2)
• 3,6/6 kV unscreened, sheathed (2,5 mm2 to 400 mm2)

All cables have class 5 or class 6 tinned or plain copper conductors to BS EN 60228, halogen-free insulation and, where applicable, 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 120°C or 150 °C and a maximum temperature for short circuit conditions of 250°C or 350 °C based on a duration of 5 seconds. When the insulating compounds and sheath specified in this standard as thermally capable of operating at 150°C are used with tinned conductors, the maximum operating temperature is limited to 120°C. For the same reason, the maximum short circuit temperature is limited to 2500C. The choice of the sheath may also limit the maximum operating temperature to 120°C.

The temperature limit for maximum operation of 120°C for tinned conductors may be increased to 150°C by agreement between the purchaser and the manufacturer.

A textile braid may be included in the insulation or applied at its surface to reinforce unsheathed cables.
These cables are intended for a limited number of applications.

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. 

Part 2 of EN 50382 should be used in conjunction with Part 1 “General requirements”