The rapid development of power transmission and distribution work has made busbar trunking accessories an indispensable component of various projects in the field of power transmission and distribution.Bus duct accessories have been rapidly developed since their introduction due to their large power supply capacity,safety and reliability,and convenient installation.Basically,copper busbars(with a few aluminum busbars)are used as current carrying conductors for busbar accessories.However,in the busbar accessory products,the quotation of conductors accounts for more than 70%of the total cost.This directly affects the cost of busbar accessories due to the increase in copper material quotations,which also has a significant impact on the expansion of manufacturers'markets.

　　Many copper materials used in the production of low-voltage switchgear rely on imports,so the development of alternative conductor materials has become a key focus in the future.A new type of busbar trunking accessory product using copper aluminum composite conductor materials instead of copper conductor materials has been presented,which to some extent reduces the demand for copper materials in busbar trunking accessory products and saves scarce copper resources.The application of this new material and technology will inevitably bring about a transformation and a new round of development in the busbar trunking accessory industry.Bus duct accessories almost do not require maintenance.Daily maintenance usually involves measuring the temperature rise of the shell and core bolts,as well as the temperature rise of the joints in the incoming box.If the core bolts are of grade 4.8,they need to be tightened regularly.If high-strength bolts of grade 8.8 are used,they do not need to be reinforced regularly.

　　The characteristics of general busbar trunking accessories are small head size,light weight,high strength,and a very large creepage distance,which can save metal materials and reduce line costs.The construction and power distribution of large buildings are very smooth,with high current flow and strong short-circuit load capacity.Compared with traditional power distribution,busbar trunking accessories significantly reduce the equipment area.Bus duct is suitable for AC three-phase four wire and three-phase five wire systems,with a frequency of 50-60Hz,rated voltage up to 660V,and rated working current of 250-6000A in power supply and distribution systems.The busbar conductor of the bus duct is made of high-purity electrolytic copper,and the entire surface of the conductor is tinned to improve its resistance to oxidation and corrosion.After processing,it is heat shrink treated with PVC pipes,and insulated blocks are used to separate the phases and ground.The copper busbar is double insulated for protection,greatly improving its insulation performance,and then enclosed in a grounded metal shell.

　　The outer shell of the bus duct is made of high-quality high-strength cold-rolled steel,which is cold-rolled into a corrugated structure in one go.It not only has a beautiful and generous appearance,but also greatly enhances the mechanical strength of the bus duct and the dynamic and thermal stability of the system,which can completely solve the problem of large-span installation on construction sites.A safety protection baffle is designed at the socket of the bus duct,and the plug-in box can only be connected when the baffle is opened,effectively preventing dust and foreign objects from entering the socket,thereby improving the protection of the bus duct,preventing misoperation,and greatly improving the safety of the bus.