The Hierarchical Structure Of The Three-level Power Distribution Box At The Construction Site

Temporary power supply management at construction sites adopts a tiered distribution model. The power distribution from the power input point to the end electrical equipment needs to go through three levels of Powbinet. This architecture uses the main distribution box as the primary hub, with several sub-distribution boxes at lower levels, forming a tree-like power supply network.

The distribution boxes are located within each construction area, no more than 30 meters from the point where electrical equipment is concentrated. Fixed equipment such as tower cranes and construction elevators are equipped with dedicated distribution boxes, while temporary facilities such as rebar processing sheds and carpentry sheds share a single distribution box. Branch circuit protection switches are installed inside the boxes to redistribute power to multiple switch boxes. The load capacity of a single distribution box is typically between 50-150kW, with the main switch rating determined based on the number of lower-level switch boxes and the power consumption of the electrical equipment.