The invention relates to electric wires or cables and protection devices which penetrate through walls, floors or ceilings and are installed in buildings, in particular to a conducting rod and a direct-current wall
bushing. The direct-current wall
bushing comprises a conducting rod, the conducting rod comprises a current-carrying conductor, one end of the current-carrying conductor is provided with a conductive connector, the other end of the current-carrying conductor is provided with a cover plate, the current-carrying conductor is provided with a center hole, and an insulating ventilation
pipe is arranged in the center hole. One end, close to the cover plate, of the insulating ventilation
pipe extends out of the cover plate, an air outlet is formed in the end opening of the end, an air inlet is formed in the other end of the insulating ventilation
pipe, the insulating ventilation pipe forms a
cooling pipe of the current-carrying conductor, and cooling of the interior of the conducting rod is achieved through the insulating ventilation pipe in an
air cooling mode; the influence of deformation caused by temperature change on the deflection of the conducting rod is reduced, the bending deformation of the conducting rod is reduced, the uniformity and stability of an
electric field in the direct-current wall
bushing are ensured as far as possible, and the insulating property of the direct-current wall bushing is ensured.