The material of the busbar slot plug-in box is mostly iron shell;Switches inside the plug-in box,the brand of which is often specified by the purchaser themselves;The firmware should use torque bolts to ensure a certain tightening force.A torque of 70~~100N/m is preferable.Excessive force can easily damage the insulation sheet,while insufficient force can cause poor contact.It is better to spray corrosion-resistant paint on the outer shell of the busbar trunking body.First tier brand products should undergo anti atomization tests to ensure that the shell is not corroded or aged in high humidity and highly corrosive gas environments.

　　The connection between the bus duct and the transformer requires a copper sheet soft connection,as the transformer generates strong vibrations during operation.Soft connections can reduce the adverse effects of vibration on bus ducts.The connection between the bus duct and the switchgear requires the use of pure copper bars for overlapping,and insulation sleeves for phase to phase insulation protection.The bus duct cover plate is used to seal the connector to prevent dust and water from entering.The structure of the cover plate can be roughly divided into two types.That is,double-sided closure and four-way closure.Using two upper and lower cover plates,with exposed bolt parts on both sides.Adopting a symmetrical top and bottom cover plate.For connectors,they can be fully enclosed on all four sides.Adopting two asymmetric side cover plates.For connectors,they can be fully enclosed on all four sides.

　　The shell is an important component of the bus duct,which plays a role in protecting the copper busbar and insulation layer from damage caused by collision,friction,compression,and other factors.In addition,the enclosure of the shell also determines the protection level of the bus duct.There are four common protection level standards for bus ducts,namely IP40,IP54,IP65,and IP68.IP40 is not waterproof and is installed in electrical rooms such as shafts and substations to prevent foreign objects of more than 1MM from entering.IP54 dustproof,splash proof,no harmful effects when splashing water in all directions towards the casing.Suitable for dense,air type,and lighting type bus ducts,generally installed in damp places such as refrigeration rooms and water pump rooms.IP65 anti dust,anti strong water spray,no harmful effects on strong water spray in all directions of the shell.IP68 can be soaked in water for a long time,which is generally not used in civil construction.It is mostly used in harsh outdoor environments,offshore work platforms,shipyards and other special occasions.From the structural form of the shell,it can be seen that the two-piece shell structure has better waterproof and dustproof performance compared to the four piece structure due to its only two contact seams.At present,the vast majority of manufacturers still use a four piece shell structure.

　　The size and installation method of the busbar trunking starting box shall be selected according to the site conditions.The plug-in box is selected based on the power of the device being used.For example,if there are 10 units of 65KW electrical equipment that require a 1350A busbar for power supply,then each plug-in box should be selected as 65 multiplied by 2,which equals 130A.If the selected brand does not have a model with 100A,it is necessary to move closer to the larger one,and an internal circuit breaker is necessary because the plug-in box takes power from the straight section of the busbar with 4 claws,which are connected to the incoming line of the circuit breaker and the outgoing line is connected to the electrical equipment with cables.Expansion joints are divided into busbar and equipment expansion and busbar to busbar expansion according to their usage scenarios.They are selected based on the material of the joint,such as aluminum for busbars,copper for equipment joints,aluminum for busbars,and copper for busbars.