The busbar plug-in box is equivalent to a cable branch joint.To obtain power from the busbar slot,a plug-in box is required,which comes with a circuit breaker.Before installing the busbar slot plug-in box,the safety baffle at the busbar slot plug-in hole should be opened.The switch inside the box should be pushed to the OFF position first,and the plug-in box pins should be inserted into the busbar slot in phase sequence from the busbar slot socket,ensuring that they are inserted in place.Do not plug or unplug with power on.After the installation of the plug-in box,the claw shaped clamps at the front and rear should be fixed on both sides of the bus duct and the screws should be tightened.When installing a plug-in box with a large switch vertically,a load-bearing support arm should be added to the bottom;When installing horizontally,load-bearing clamps should be added.

　　The plug-in box is only responsible for guiding points from the bus duct to the required location.There are switches inside the plug-in box,and one end of the plug-in box is inserted into the bus duct,while the other end is connected to a cable,which is then connected to the floor distribution box through the cable.The busbar starting box is the incoming box for inserting busbars.It is a busbar insertion box installed at the starting point of the power supply incoming line at the beginning of the plug-in busbar.The starting box,also known as the feeding unit,is subdivided into the terminal cable feeding box and the middle cable feeding box.The beginning means the beginning,which is the device that supplies power to the busbar.Its structure is a spray painted shell with a flange inside.One end of the flange has four open claws with holes for overlapping with the low-voltage cabinet copper bar or cable.The other end is matched with the busbar straight section and can be directly inserted into the busbar head to connect the busbar straight section.There is usually a grounding wire position next to the four claws.

　　The busbar terminal box is a busbar branch plug-in box that connects the middle or end of the busbar for branching and outgoing lines,and is called a terminal box.The starting box is the main power supply inlet box,with a relatively high load power;The terminal box belongs to the branch box and has a relatively low load power.When the design of the starting box is 800A,the other branch terminal boxes are in the range of tens to one or two hundred amperes,which is determined by calculating the branch load design;The installation of the busbar starting box and terminal box should comply with the quota sub item"Installation of enclosed busbar trunking inlet and outlet distribution box"in the"Busbar Installation"chapter of the electrical installation quota.The specific sub item should correspond to the design rated current of the box,and the busbar plug-in box is equivalent to a cable branch joint.To obtain power from the busbar trunking,a plug-in box is required,which comes with the plug-in box.