There are many internal support structures in the air type busbar,which inevitably increases the number of fault points.Any damage or detachment of any support component can cause major accidents to occur;The assembly of the air type busbar shell is mainly done using bolt connections,while the dense type busbar duct is assembled using a fully automatic riveting system.The former is prone to bolt loosening and detachment during electrical operation(accompanied by vibration),which poses a safety hazard.The latter abandons traditional bolt connections,has good electrical continuity,avoids human factors,and has high assembly accuracy.The hollow structure of the air type busbar has an unavoidable"chimney effect".Once a fire breaks out,the hollow structure acts as a chimney,accelerating the spread of the fire and posing a serious safety hazard.

　　The accessory components of dense busbar trunking generally refer to plug-in box kits,plug-in interfaces,connectors,elbows,flange ends,cable entry boxes,busbar end seals,horizontal brackets,spring brackets,flexible connections,variable capacity joints,tees(T-joints),elbows(horizontal and vertical),expansion joints,which may not be used in every project.It depends on the situation.The bracket is used to cushion the compression of busbars during connection;Connectors are used for connection purposes;Connecting copper bars is used for the connection between the cabinet body and the busbar;Plug in box is made according to the requirements on the drawing for power supply and other purposes.It is divided into pre assembly processes,packaging,polishing,outsourcing,assembly,packaging,and small parts in the busbar workshop.The front process includes making the shell,cutting copper bars,bending copper bars,making side panels,making the boards and brackets for the plug-in box shell,and so on.

　　The quotation for busbar trunking is divided into straight section and accessory quotation.The straight section is quoted per meter per ampere,and elbows,flanges,feeding boxes,installation brackets,etc.are included in the straight section or listed separately.The plug-in box must be quoted separately.The common types of bus duct casings are aluminum magnesium alloy casings,and some are steel casings.These casings are insulated,with insulation layers directly between the casing and the conductor.There are also insulation pads between the conductive bars and the casing,and insulation between the phases.So,the casing is insulated,very safe,and the insulated casing is grounded.