With the development of distribution network's cable process, when the independent load distribution of small capacity is centralized, cable branching box can be used to connect multiple branches of cables. As long as any trigger acts, the linkage will make the three phases of load switch automatically open at the same time. The cable branch box can meet the requirements of various normal and failure operation protection of the distribution system.

When there are a plurality of small area in a relatively long distance cable line is often used in the wire and cable waste to electricity load, often use the trunk cable outlet, then when close to the load, the use of cable branch box will be divided into several small area of main cable cable, cable access by small area load so, connection mode is widely used in city power grid street lamp power supply, small power supply.

At present, there are various kinds of cable branches in our country. Therefore, the installation and construction of the cable branch box becomes very important. The operation method of cable branch box and cable joint installation and connection process is correct, the installation process is familiar with the cable head, cable assembly and internal cable branch box joint parts order, whether in accordance with the manufacturers provide installation specification for operation and so on, will directly affect the service life of the cable branch box and normal operation.