BS EN 50306-3:2020 pdf free.Railway applications一Railway rolling stock cables having special fire performance一Thin wall,Single core and multicore cables screened and thin wall sheathed.
BS EN 50306-3 This document specifies requirements for, and constructions and dimensions of, multicore cables, rated voltage Uo/ U = 300/500 V, of the following type: Screened (0,5 mm2 to 2,5 mm2, number of cores from 1 to 8).  AIll 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.The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 45545-1, Railway applications – Fire protection on railway vehicles – Part 1: General 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 kW pre-mixed flame EN 61034-2, Measurement of smoke density of cables burning under defined conditions – Part 2: Test procedure and requirements EN 50305:2020, Railway applications – Railway rolling stock cables having special fire performance – Test methods EN 50306-1:2020, Railway applications – Railway rolling stock cables having special fire performance – Thin wall – Part 1: General requirements BS EN 50306-3 pdf download.