The small voltage drop of the enclosed bus duct bus 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.The enclosed bus duct adopts copper or aluminum bars,which have high current density,low resistance,and small skin effect,and do not require derating.And its skin effect is severe,reducing the rated current,increasing the voltage drop,and making it easy to generate heat.The energy loss of the circuit is high and it is prone to aging.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.

　　The metal enclosure of the enclosed 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 enclosure can be grounded as a whole,and the grounding is very reliable.However,the PVC enclosure of the cable is susceptible to mechanical and animal damage.When installing the cable,the power must be cut off 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.

　　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.Closed busbar trunking has many advantages,but it is also limited by certain conditions in practical applications,such as the type and distribution of electrical loads,installation space,engineering investment amount,and so on.

　　Generally,architecture majors will design installation spaces for enclosed bus ducts,with one or more plug-in switch boxes installed on each floor.The plug-in switch boxes will then send power to various electrical equipment and circuits through cables and wires.In order to ensure electrical safety,attention should be paid to ensuring the continuity of the power supply line during design,and a dual circuit form should be considered,with a certain safety interval between the two circuits as much as possible;When selecting the specifications for enclosed bus ducts,the conductor cross-section should be as large as possible to ensure sufficient residual capacity;More plug-in interfaces should be set up,but the operating height and power feeder path should be considered,because too many vertically arranged enclosed bus duct sockets will make the height of the plug-in box on each floor too high,making operation and maintenance inconvenient.