Cable holder for fastening to pipes, e.g. with pipe clamp for laying the HVI cable in potentially explosive areas of Ex Zone 1 (gases, vapors, mists) and Ex Zone 21 (dust). The special installation conditions ensure that an electrical spark to neighboring metal parts is prevented when lightning current passes through the HVI cable. Version with spacer sleeve, 70 mm spacing, for fastening to metal construction parts (e.g. facades).