Compared with ordinary cables,bus ducts have shown strong advantages as the main power supply line.However,over time,operational practice has shown that bus ducts themselves have many irreparable defects,so bus ducts are not ideal power supply products as the main power supply line.Firstly,it is expensive,requires a large installation area,has a long installation cycle,and is labor-intensive,resulting in a significant initial investment.Secondly,its production method is mostly handmade,and the product quality cannot be controlled or guaranteed.In addition,there are too many joints,resulting in multiple failure points,thus its power supply reliability is poor.Thirdly,its moisture resistance and corrosion resistance are poor,and the installation environment and requirements are high,resulting in a large amount of maintenance work.

　　During transportation and storage,the insulation layer of the bus duct will become damp and deteriorate,and the copper bars will oxidize and corrode,especially the connecting copper bars,which are more prone to oxidation and corrosion,resulting in a decrease in electrical performance.Therefore,the bus duct must be maintained and serviced before installation.The selection of the casing for the bus duct should meet the requirements of mechanical loads.The interconnected components of the casing can be welded or bolted together,but the electrical continuity of the casing connected by bolts should be ensured.The fasteners used should have a good coating,and the surface of the casing should be covered with a heat-resistant and flame-retardant coating that can prevent atmospheric corrosion.The coating should be uniform,neat,beautiful,and free of defects such as bubbles and cracks.In the power supply system of high-rise buildings,the power and lighting lines are often set separately,and the bus duct is installed vertically along the wall in the electrical shaft as the main power supply line.

　　The enclosed dense busbar should be used as a low-voltage switchgear and control equipment that has passed type testing.The structure of the enclosed busbar is reliable,easy to install,easy to maintain,and can withstand the mechanical,electrical,and thermal stresses specified in the standard.The material should be surface treated with electrostatic spraying.The selection of busbar casing should meet the requirements of mechanical load(plate thickness should meet technical requirements),and hard riveting should be used between the interconnected components of the casing.The fasteners used should have a good coating,and the surface coating of the casing should be treated with electrostatic spraying,with a color of computer ash.The coating can resist atmospheric corrosion agents and meet fire protection requirements.The appearance should be uniform,neat and beautiful,without bubbles,cracks,etc.

　　Bus duct,as a new type of distribution wire,has emerged.Compared with traditional cables,it fully demonstrates its superiority in high current transmission.At the same time,due to the use of new technologies and processes,the contact resistance and temperature rise at the connection points of both ends of the bus duct and the junction of the distribution port are greatly reduced.High quality insulation materials are also used in the bus duct,thereby improving its reliability and making the entire system more complete.Bus duct is a bus system composed of metal plates as protective shells,conductive bars,insulation materials,and related accessories.It can be made into a plug-in enclosed busbar with plug-in junction boxes at regular intervals,or a feeding enclosed busbar without a junction box in the middle.