The power distribution cabinet (box) consists of power distribution cabinet (box), lighting distribution cabinet (box) and metering cabinet (box), which are the final equipment of the distribution system. Distribution cabinet is the general name of the motor control center. The power distribution cabinet is used in the occasions where the load is relatively dispersed and the circuit is less; The motor control center is used for load concentration and many circuits. They distribute the electrical energy of a circuit of the upper level distribution equipment to the nearest load. This level of equipment should provide protection, monitoring and control of the load.