The busbar adopts copper or aluminum bars,which have high current density,low resistance,and small skin effect,and do not require derating.A small voltage drop also means low energy loss,ultimately saving users'investment.For cables,due to the fact that the cable core is made of multiple thin copper wires,its root area is larger than that of busbars of the same current level.And its"skin effect"is severe,reducing the rated current,increasing voltage drop,and making it easy to generate heat.The energy loss of the circuit is high and it is prone to aging.For dense bus ducts,system expansion can be achieved by adding or changing several segments,resulting in a high reuse rate.In most cases,cables cannot be reused because their length and route are different.If we want to expand the system,we need to purchase new cables to replace the old ones.

　　The metal enclosed shell of the busbar duct can protect the busbar from mechanical or animal damage.It is safe to install it using plug-in units in the distribution system.The shell can be grounded as a whole,and the grounding is very reliable.However,the PVC shell of the cable is prone to mechanical and animal damage.When installing the cable,cut off the power first.If there is an error,it will be very dangerous,especially if the cable needs to be grounded on site.The unreliable grounding increases the risk.The busbar is composed of many sections,each of which is short and light in length.Therefore,only a few people are needed to quickly complete the installation.There are many standard parts and inventory for busbars,which can be shipped quickly and save on-site work time.Its tight"sandwich"structure can reduce electrical space,freeing up more space for commercial purposes such as renting or as public spaces.

　　For installing cables,it is a difficult task.Because a single cable is often heavy,installation work requires the cooperation of many people and takes a lot of time to complete.In addition,due to the bending radius of the cable,more installation space is required.By using bus ducts,we can merge certain branch circuits and convert them into a large bus duct using plug-in boxes.It can simplify the electrical system and obtain lower current values for more wires.Therefore,it saves the cost of the project and is easy to maintain.For traditional cable lines,cables make the electrical system extremely complex,large,and difficult to maintain,which wastes engineering costs and installation space.For dense bus ducts,system expansion can be achieved by adding or changing several segments,resulting in a high reuse rate.In most cases,cables cannot be reused because their length and route are different.If we want to expand the system,we need to purchase new cables to replace the old ones.