Busway systems (abbreviated as busways) consist of a metal casing (steel or aluminum plate) for protection, conductive bars, insulating materials, and relevant accessories, forming a busbar system. They can be manufactured as a type of busway with junction boxes at regular intervals for connection, or as a power transmission type without junction boxes in the middle. In the power supply systems of high-rise buildings, power and lighting circuits are often separately installed. The busway acts as the main power line, vertically mounted on the wall inside the electrical shaft, either once or multiple times.
A busway system, typically used for a single run, is composed of components such as the starting busway, straight-through busway (available with and without sockets), L-shaped vertical (horizontal) bends, Z-shaped vertical (horizontal) offsets, T-shaped vertical (horizontal) tees, X-shaped vertical (horizontal) crosses, variable capacity busway, expansion busway, related accessories, and fastening devices.
Busbars can be divided into three types according to the insulation method: air-insulated busbars, dense-insulated busbars, and high-strength busbars.
High-strength enclosed busway (CFW). Its manufacturing process is not limited by sheet materials; the housing is designed in a corrugated form, enhancing the mechanical strength of the busbars and allowing for horizontal sections up to 13 meters in length. The intentional separation and fixation of the busbars at the groove positions, with an 18mm spacing between them, ensures good ventilation and significantly improves the moisture-proof and heat dissipation functions of the busway, making it particularly suitable for southern climates. The presence of gaps between the wires reduces the wire temperature rise, enhancing overload capacity and minimizing magnetic oscillation noise. However, it generates much higher stray currents and inductive reactance compared to dense busways, so when compared with the same specifications, its conductive busbar cross-sectional area is larger than that of dense insulated connector busways.