Electric cables

Claim 1

An electric cable, comprising a. at least one metallic conductor, b. a fluid impregnated dielectric surrounding said conductor and bounded at each of its inner and outer circumferential surfaces by an electric screen in contact with said fluid and formed from a fibrous material in the form of a flexible sheet loaded with conductive carbon black and c. an external fluid-tight sheath, the said cable being characterized in that the said electric screens each comprise a first layer of a multi-ply fibrous sheet material comprising one ply contiguous with the dielectric and loaded with an active finely divided adsorbent material selected from the group consisting of aluminum oxide and such other active metallic oxides, hydrated metal oxides, metal hydroxides, metal carbonates and basic metal carbonates as have adsorptive powers comparable with that of active finely divided aluminum oxide and another ply loaded with conductive carbon black and a second layer of material loaded with conductive carbon black and contiguous with said other play and further characterized in that the said dielectric is free of any adsorbent material.