Generally, the first-level distribution box is required to be installed in a place with a relatively high terrain, dry and ventilated, and the second-level and third-level distribution boxes should be as close as possible to the electrical equipment. (3) Power distribution from tertiary switch boxes to electrical equipment must follow the “one machine, one switch” principle, with no branching allowed. According to the hierarchical. The outgoing line from the low-voltage end of the transformer is 0. 4kV to the distribution cabinet (primary distribution cabinet), then the outgoing line is led to the distribution box (secondary distribution box) in each building, and finally the outgoing line is led to the distribution cabinet. Further, the loads must be shut down to perform maintenance on the system. "Two-level protection" mainly refers to the use of leakage protection. A recloser is a device with the ability to detect phase and phase‐to‐ground overcurrent conditions, to interrupt the circuit if the overcurrent persists after a predetermined time, and then to automatically reclose to re‐energise the line. 4kV), power is distributed to a main distribution panel (primary distribution box).