1 Scope
This document specifies requirements for, and constructions and dimensions of, multicore
cables, rated voltage U 0 / U = 300/500 V, of the following type:
Screened (0,5 mm 2 to 2,5 mm 2 , 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.