Closed busbar trunking is a busbar trunking system composed of metal plates with protective shells, conductive bars, insulating materials, and related accessories. It can be made into a plug-in closed busbar with plug-in distribution boxes at intervals, or a feed-in closed busbar without plug-in distribution boxes in the middle. In the power supply system of high-rise buildings, power lines and lighting lines are often set up separately, and busbar trunking is vertically installed along the wall in the electrical shaft as the main power supply line.

According to Applications, busbar trunking generally consists of signal transmission busbar trunking, vertical busbar trunking,Type I vertical curve busbar trunking, Z-type vertical offset busbar trunking, T-type vertical three-way busbar trunking, X-type cross vertical busbar trunking, deformed busbar trunking, expansion busbar trunking, terminals, terminal boxes, plug boxes, busbar trunking related accessories and fastening devices, etc.

According to the insulation method, it can be divided into three types: air plug-in busbar, dense insulation plug-in busbar, and high-strength plug-in busbar. Air busbar trunking. Due to the copper soft connection transition between the busbar joints, the weather in the south is humid, and oxidation is easy to occur between the joints, resulting in poor contact between the joints and the busbar trunking, making the contact surface easy to heat up. It is rarely used in the south. Moreover, the volume between the seams is too large, the horizontal passenger car section Size is inconsistent, and the appearance is not beautiful enough. Busbar trunking with dense insulation. Its moisture-proof and heat dissipation effects are poor.

In terms of moisture-proof, passenger cars are easily affected by moisture and water seepage during construction, leading to a decrease in interphase insulation resistance. The heat dissipation of passenger cars mainly relies on the shell. Due to the compact arrangement of lines and lines,The thermal energy of the L2 and L3 phases is slowly distributed, resulting in a high temperature rise of the busbar trunking. Densely insulated busbar trunking is limited by the shell and can only produce horizontal sections of no more than 3M. Due to the small air gap between the busbars, when the busbars pass a large current, a strong electric power will be generated, causing the magnetic oscillation frequency to form a superimposed state, thus generating excessive noise. High-strength closed busbar trunking.

The manufacturing process is not limited by the plate material, and the shell is made in a tile trough form, which increases the mechanical strength of the passenger car, and the horizontal section of the passenger car can be produced up to13M long. Because the shell adopts a tile trough form, the pit trough position is intentionally fixed separately from the busbar trunking, and the distance between the busbar trunkings is between 18MM. The good ventilation between the lines significantly improves the moisture-proof and heat dissipation functions of the busbar trunking, making it more suitable for the southern climate; due to the certain gap between the conductors, the temperature rise of the conductors is reduced, thereby improving the overload capacity and reducing magnetic oscillation noise.

However, the stray current and inductive reactance it generates are far greater than those of dense busbars, so when compared with the Specification, the cross-section of its conductive bars should be larger than that of dense insulation insertion. The plug-in belongs to the trunk line system, and has the advantages of small Size, compact structure, reliable operation, large transmission current, convenient connection and power supply, convenient maintenance, low energy consumption, good dynamic and thermal stability, etc. It is widely used in high-rise buildings.