ELECTRIC CABLE ELEMENT WITH LAMINATED METAL-INSULATION SHIELD WITH PERFORATED INSULATION AND A CABLE UDING A PLURALITY OF SUCH ELEMENTS

摘要

1413924 Telecommunications cables INDUSTRIE PIRELLI SpA 16 April 1974 [19 April 1973] 16644/74 Heading H1A One or more longitudinally applied screening tapes for a cable element comprise a metal layer 20, 43 preferably of aluminium foil bonded to a layer 22, 45 of plastics material e.g. polyethyleneglycoletherphthalate; polypropylene, or a thermoplastics material, which is provided with apertures 25, 46. When a number of such elements are laid up together to form a cable the screens make electric contact periodically along the cable length through the apertures and so equalize screen potentials. The plastics layers 22, 45 may be approximately 1/100th of a millimetre thick. A plastics layer 21, 44 of, for example, polyethylene, may be bonded to the inward facing surface of the metal layer 20, 43.