Cables from 4 to 37 pairs with 0.8 mm copper conductors. Solid PE insulation twisted into pairs and stranded in layers. Bedding of PE, steel wires armouring and external black PVC sheath. These cables are intended for feeder protection and speech and data transmission. They have been designed to operate as an integral part of a power cable system and to withstand induced voltage levels due to fault currents in adjacent circuits up to 15 Kv.