DS EN 50306-3:2002 Railway Applications - Railway Rolling Stock Cables Having Special Fire Performance - Thin Wall - Part 3: Single Core And Multicore Cables (Pairs, Triples And Quads) Screened And Thin Wall Sheathed Defines requirements for, and constructions and dimensions of, multicore cables, rated 300 V to earth, of the following type: Screened (0,5 mm[2] to 2,5 mm[2], number of cores from 1 to 4).