Connects to end-use equipment via switch boxes, forming a three-tier power distribution system. Residual current devices (RCDs) at both the tertiary (equipment-level) and secondary (zone-level) stages. Ensures safe disconnection in case of faults or leakage currents. The construction power distribution cabinet is designed specifically for the special situation of the construction site and complies with the relevant construction electricity specifications and standards of the construction department. Let's make an example for clarity: A newly constructed residential area introduces a 10kV power line to a substation. 4kV), power is distributed to a main distribution panel. (1) Power distribution from the primary main distribution board (distribution cabinet) to secondary distribution boards can be branched; that is, one main distribution board may supply power via multiple branch circuits to several secondary distribution boards. After stepping down the voltage through the transformer's low-voltage side (0.