At present, the mainstream bus ducts on the market are all aluminum alloy shell fully enclosed intensive bus ducts. Iron shell bus ducts have been eliminated and only some small companies are producing them. Compared with intensive bus ducts, air-type bus ducts are large in size, inconvenient to transport and install, and only some small companies are producing them. The aluminum alloy shell intensive bus duct has good heat dissipation, energy saving and environmental protection, and other factors, making it a more advanced product.