Railway signalling cables from 3 to 56 pairs. Copper conductor of 1 mm2, insulated with solid coloured polyethylene. Stranded into pairs. Shielded with corrugated copper tape and armoured with two steel tapes applied helically. PVC unleaded outer sheath. This cable is flame retardant and resistant to mineral oils. This cable is used to connect the control centre to the centres of satellite equipment. It can also be installed in short lengths along routes electrified at 25 kV ac.