... power cableFor laying indoors, in tunnel or cable trench,unable to bear extermal mechanical forces. Single core cable is not permissible ... wire armoured,PVC insulated power cable For laying indoors, in cable or direct in ground ,able to bear external mechanical forces, but unable ... , streel wire armoured ,PE sheathed power cableNote: The armoured single core cables is only used for D.C.system. As ...