... cableFor laying indoors, in tunnel or cable trench,unable to bear external mechanical forces.Single core cable in magnetic duct is not ... tape armoured,PVC sheathed electrical cableFor laying indoors, in tunnel or cable trench,able to bear external mechanical forces, but ... wire armoured,PVC sheathed electrical cableFor laying indoors, in tunnel, cable trench, well and direct buried.Able to bear external ...