According to their application, busbar trunking generally consists of starting busbar trunking, straight-through busbar trunking (with and without sockets), L-shaped vertical (horizontal) bend busbars, Z-shaped vertical (horizontal) offset busbars, T-shaped vertical (horizontal) tee busbars, X-shaped vertical (horizontal) four-way busbars, variable-capacity busbar trunking, expansion busbar trunking, terminal end caps, terminal junction boxes, plug-in boxes, related accessories, and fastening devices.
According to the insulation method, it can be divided into three types: air-insulated plug-in busbar trunking, compact insulated plug-in busbar trunking, and high-strength plug-in busbar trunking.
Air-insulated plug-in busbar trunking (BMC). Because the joints between busbars use copper strips for flexible transition, oxidation easily occurs between the joints in the humid southern climate, leading to poor contact between the joints and the busbars, causing the contacts to overheat. Therefore, it is rarely used in the south. Furthermore, the joints are too bulky, the horizontal busbar sections have inconsistent dimensions, and the appearance is not aesthetically pleasing.
Compact insulated plug-in busbar trunking (CMC). Its moisture-proof and heat dissipation effects are relatively poor. Regarding moisture protection, the busbar is easily affected by moisture and water seepage during construction, causing a decrease in phase-to-phase insulation resistance. Heat dissipation of the busbar mainly relies on the outer casing. Due to the tight arrangement of the wires, heat dissipation in phases L2 and L3 is slow, resulting in a higher temperature rise in the busbar trunking. Due to limitations in the outer casing material, densely insulated plug-in busbar trunking can only produce horizontal sections no longer than 3m. Because of the small air gap between busbar phases, when a large current flows through the busbar, a strong electrodynamic force is generated, causing the magnetic oscillation frequencies to overlap, resulting in excessive noise.
High-strength enclosed busbar trunking (CFW). Its manufacturing process is not limited by the material; the outer casing is made in a corrugated pattern, increasing the mechanical strength of the busbar. Horizontal busbar sections can be produced up to 13m in length.
