ethylene ethyl acrylate copolymer eea ethylene butyl acrylate copolymer eba or mixtures thereof at least one of the semiconductive layers 3 and 5 is made by extruding a semiconductive polymeric composition according to the present invention around the outer semiconductive layer 5 a metal screen layer 6 is usually positioned generally made of electrically conducting wires or strips helically wound around the cable core the electrically conducting material of said wires or strips is usually copper or aluminium or alloys thereof this screen layer 6 is then covered by a sheath 7 usually applied by extrusion of a polymeric material such as polyethylene or polyvinylchloride the cable can be also provided with a protective structure not shown in fig1 the main purpose of which is to mechanically protect the cable against impacts or compressions this protective structure may be for example a metal reinforcement or a layer of expanded polymer as described in wo 98 52197 in the name of the applicant the cable according to the present invention may be manufactured in accordance with known methods for example by extrusion of the various layers around the central conductor the extrusion of two or more layers is advantageously carried out in a single pass for example by the tandem method in which individual extruders are arranged in series or by co extrusion with a multiple extrusion head when required after the extrusion step the cable core is cross linked according to well known techniques the screen layer is then applied.