The copper clad aluminum is divided into the following three types:
Hard bus: including rectangular bus, round bus, tubular bus, etc.
Soft bus: including aluminum strand, copper bus
Steel core aluminum strand, diameter hollow wire and so on. Closed bus lines: including a common box bus, split phase bus, copper busbars etc.
Performance

The busbar adopts copper platoon or aluminium row, its current density is large, small resistance, small skin effect, no need to be used. A small voltage drop also means that the energy loss is small and ultimately saves the user's investment. And for cable, because the cable core is a multi-strand fine copper wire, its root area is larger than the bus of current grade. And its "skin effect" is serious, reduce the current rating, increase voltage drop, easy to heat. The energy loss of the line is large and easy to age.
Security

CCA busbar duct metal closed shell can protect the busbar from mechanical damage or animal damage, in the distribution system using the plug-in unit installation is safe, grounding shell can be used as a whole, the ground is very reliable, and cable PVC casing are susceptible to damage mechanical and animals, when installing the cable must be cut off power supply first, if there are errors could be dangerous, especially the grounding cable for field work, grounding is not reliable, leading to increased risk.