It is divided into fully insulated tubular busbar and semi insulated tubular busbar by insulation
Fully insulated tubular busbar：Copper pipe or aluminum pipe or alloy pipe is used as the conductor, and a kind of insulation layer is applied externally. The insulation effect can be achieved by the insulation layer alone. The surface potential is zero, and it can be touched. It can be applied to any environment, with stable and safe operation and high protection level.
Semi insulated tubular busbar：The same copper pipe, aluminum pipe or alloy pipe is used as the conductor, and the same insulation layer is applied. However, the insulation layer is relatively thin, mainly relying on the insulator for insulation, which has not reached the full protection effect. The operating skin has induced current, which is suitable for outdoor overhead incoming line.
Distinguish from material：Copper tube bus and aluminum tube bus
Aluminum tube busbar：The tubular busbar mainly uses aluminum or aluminum alloy as conductor. The conductivity of aluminum is second only to silver, copper and gold. Although its conductivity is only 2 / 3 of that of copper, its density is only 1 / 3 of that of copper. Therefore, in order to realize the transmission of the same amount of electricity, the aluminum tubular busbar often needs to be enlarged and thickened. In addition, the oxide film on the surface of aluminum not only has corrosion resistance, but also has certain insulation. In addition, the price of aluminum tube bus is cheap. For engineering projects with cost requirements, aluminum tube bus is still quite widely used in power construction.
(aluminum refers to aluminum alloy, including aluminum silicon alloy, aluminum copper alloy, aluminum magnesium alloy, aluminum zinc alloy, etc., generally aluminum magnesium silicon alloy)
Copper tube busbar：As the name implies, the tubular bus with copper as the conductor has the best conductivity and the longest service life. In power construction, the copper tubular bus is also widely used in engineering projects with relatively high requirements for current transmission, but the price is relatively high. The budget requirement is not high, and the aluminum tube bus can be used in the project.