a cable with recyclable covering , particularly for transporting or distributing medium or high voltage energy , in which at least one covering layer is based on thermoplastic polymer material comprising a propylene homopolymer or a copolymer of propylene with ethylene or an α - olefin other than propylene in mixture with a dielectric liquid . the cable of the invention possesses superior mechanical and electrical properties , including high dielectric strength , in particular enabling it to be used at high operating temperature .