The internal configuration of the single-phase distribution box consists of one phase (L), one neutral (N), one earth (PE) wire, and a single-phase busbar system. It also has the main switch and multiple MCBs for branch circuits, as well as for leakage protection with RCD. The three-level distribution system refers to a system that distributes electric power through three levels of distribution devices from the incoming power line at the construction site to the electrical equipment. The neutral wire (N wire) is the neutral wire. The. Figure 31A1 – TN-S system 3-phase, 4-wire with separate the neutral conductor and the protective conductor throughout the distribution system Figure 31H – TN-S DC 3-wire system In TN-C-S AC systems, as for example shown in Figure 31B1, the protective conductors “start” at the points of. The complete set of products can form a complete three-level protection system for construction electricity, achieving the goal of one machine, one switch, and one protection, which is very suitable for various standard engineering applications. It provides convenience for protection, control and maintenance.
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