... conductor ,PVC insulated ,PVC sheathed power cableFor laying indoors, in tunnel or cable trench,unable to bear extermal mechanical forces ... insulated, steel wire armoured,PVC insulated power cableFor laying indoors, in cable or direct in ground ,able to bear external ... of the cable diameter ,the bending radius of multi-core cable should not be less than 15 times of the cable diameter. dc power cable