Busbar trunking is a busbar system composed of metal plates as protective shells,conductive bars,insulation materials,and related accessories.It can be made into plug-in enclosed busbars with plug-in junction boxes at regular intervals,or into feeding enclosed busbars without junction boxes in the middle.Copper bars or aluminum alloy bars are generally used as conductors for bus ducts.To prevent oxidation on the surface of the bus duct,tin plating or silver plating is applied to the surface of the bus duct.Bus ducts are divided into main units,feeding units,tap units,variable diameter units,expansion units,various bending units,etc.

　　The mainline unit is divided into mainline units without tapping devices and mainline units with tapping devices.Both types of mainline units with the same current level have the same basic structure and external dimensions,making them easy to connect and install.The feeding unit includes incoming units,incoming boxes,intermediate incoming boxes,and other units.The incoming unit is matched with the incoming box to form the connection component between the bus duct and the cable.The incoming unit can be directly connected to the distribution cabinet or transformer as the power input or output terminal of the bus duct.

　　The tapping unit adopts a plug-in junction box,which leads out the power branch from the main line.The tapping current of the junction box is determined by the circuit breaker.The variable diameter unit is used to connect the transition section of two different rated current busbar main units,and the standard length of the variable diameter unit is 1 meter.It can change from any current level between 60~5000A to another current level.There are four types of bending units:L-shaped,T-shaped,Z-shaped,and cross shaped,which are used for connecting horizontal and vertical distribution bus ducts and changing the direction of the bus.Copper conductors for bus ducts should be made of purple copper,as the purity of copper is generally not high.

　　Copper bars or aluminum alloy bars are generally used as conductors for bus ducts.To prevent oxidation on the surface of the bus bar,tin plating or silver plating is applied to the surface of the bus bar.When the coating thickness is not specified,flash plating is used for surface treatment.Although the treatment cost is reduced,there is no significant improvement in the corrosion resistance of the busbar,resulting in corrosion and oxidation of the busbar in just a few years of use,greatly reducing its electrical performance.The busbar conductor is made of high-quality copper bars,and the outer shell is also used as a PE wire,with good grounding effect and safer use.