Bus duct accessories belong to the trunk type system,which has the advantages of small size,compact structure,reliable operation,high transmission current,easy tapping and feeding,convenient maintenance,low energy consumption,and good dynamic and thermal stability.They are widely used in high-rise buildings.In the past,the casing of bus ducts was generally formed by bending steel plates or using simple aluminum alloy profiles.Due to the lack of certain waterproof measures for these two types of casings,water can easily penetrate the bus ducts during fire extinguishing or when they are exposed to rain,causing short circuits and resulting in a generally low waterproof rating and poor product quality.

　　The overlap size of busbar duct accessory joints shall be made by drilling holes with a drill according to the regulations.When bending the busbar trunking,first make a large sample,and then cold bend according to the size of the large sample.There should be no cracks or significant wrinkles at the busbar bending point.The distance between the busbar bending point and the connection point should not be less than 50mm.The bending degree of multiple busbars should be consistent,and the small bending radius should comply with the specifications.Busbar duct accessories include 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,depending on the situation.

　　Low voltage dense busbar trunking consists of straight sections,elbows,tees,flanges,cable transfer boxes,terminal seals,and plug-in boxes.Connectors are generally included in the quotation for straight sections,although some manufacturers may quote separately.Straight section,elbow,tee,flange,cable adapter box,terminal seal,plug-in box.Generally refers to brackets such as spring brackets,busbar connectors,connecting copper bars,and plug-in boxes,which are used to buffer the compression of busbars during connection.Connectors are used for connection,connecting copper bars are used for the connection between cabinets and busbars,and plug-in boxes are used for power supply according to the requirements on the drawings.

　　The surface treatment of busbar trunking accessories is a very important task,which includes processes such as acid washing,phosphating,drying,powder coating,and curing.The shell coated with polyester epoxy powder has strong surface adhesion and can maintain insulation for a long time.The installation site for busbar trunking accessories should not exceed an altitude of 2000m,and the surrounding air temperature should not be higher than+40℃or lower than-5℃.The average temperature of the product within 24 hours should not exceed+35℃,and the relative humidity of the air should not exceed 50%at 40℃and 90%at 20℃.The air around the busbar trunking accessories is clean and free of corrosive and insulating gases from Egypt.The busbar accessory conductive copper bar is composed of pure copper bars,and the surface of the conductive copper bar joint should be uniformly tinned or silver plated.The insulation material is composed of high-strength insulating plastic blocks made of polytetrafluoroethylene and polycarbonate.