It is best to have a picture of how to configure the first-level distribution box at the construction site.

1. The power distribution system is equipped with power distribution cabinets or general distribution boxes, distribution boxes and switch boxes, with three-level power distribution and three-level protection, and the distribution boxes at all levels are equipped with leakage protectors. Several distribution boxes can be set below the main distribution box; A plurality of switch boxes can be arranged below the distribution box. The main distribution box should be located near the power supply, and the distribution box should be located in the area where the electrical equipment or load is relatively concentrated. The distance between distribution box and switch box shall not exceed 30m. The horizontal distance between the switch box and the fixed electrical equipment it controls should not exceed 3m. Around the distribution box and switch box, there should be enough space and channels for two people to work at the same time. Do not pile up anything that hinders operation and maintenance; There are no shrubs or weeds.

2. Power distribution box and lighting distribution box, power switch box and lighting switch box should be set separately.