The products are mainly applicable for power supply distribution system with supplying rated voltage under 1000V in middle and buildings, factory, mine, highway, runnel, airport, bridge, the places for cultural or sports activities, enterprise and institution. It has advantages such as safety in power supply, excellent insulation, ease in construction, low wide application, multiple categories, low requirement to installation environment and convenience in design and so on, it is at large used abroad and an ideal substitute for general cable and bus duct. In comparison with bus duct, it has even more functions e.g. shock proof, waterproof and fire resistance and avoids installation and maintenance of bus duct.