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. Third level distribution box: refers to the final junction box of each electrical appliance, which can be movable and fixed. The requirements for the distribution. (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. It distinguishes its primary purpose by providing centralized, secure housing for sensitive protective. That is, a distribution electric box is arranged under the general distribution box, and a switch box is arranged under the switch box, and electrical equipment is arranged under the switch box to form a three-level distribution. "Two-level protection" mainly refers to the use of leakage protection. Power Distribution Equipment is a term generally used to describe any apparatus used for the generation, transmission, distribution, or control of electrical energy.
