Electric cable with a low-conductivity layer - has a barrier layer between this and the outer plastics sheath

摘要

A high voltage cable (for >=20kV) with several conductors, a low conductivity layer contg. C black in an elastomeric or plastomeric plastics mtl. and an outer layer of metal wires covered with a plastics sheath, has a barrier layer around the low conductivity layer, consisting of a foil with a polyester, polyamide or polypropylene base to prevent permeation from the low conductivity layer and consequent discolouration of the outer sheath.