Explosion-proof distribution boxes are distribution systems that comprise flameproof (Exd) enclosure, increased safety bus bar boxes and terminal boxes. The surface of explosion-proof distribution boxes are sprayed epoxy resin powder, therefore they can satisfy the requirements of anti-corrosion in chemical, petrochemical and sea industries. The group of explosion-proof distribution boxes are ⅡB or ⅡC. The explosion-proof distribution boxes are used for distribution and overhauling of single phase illumination and 3-phase power system in the circuits of AC 50Hz, 220/380V. Different circuit distribution systems may be combined according to the requirements. Besides the standard combinations, the explosion-proof distribution boxes may be designed as user's special requirements.