1. The power distribution system for construction shall be provided with a main distribution box, distribution electric box, and switch box, and shall be graded in the order of "total-sub-open", and form a "three-level distribution" mode.
2. The installation location of each distribution box and switch box of the power distribution system for construction should be reasonable. The main distribution box should be as close to the transformer or external power source as possible to facilitate the introduction of power. The distribution box should be installed as much as possible in the center of the power equipment or the load is relatively concentrated to ensure that the three-phase load remains balanced. The installation position of the switch box should be as close as possible to the electrical equipment it controls according to the site conditions and working conditions.
3. Ensure the three-phase load balance of the temporary power distribution system. The power and lighting power at the construction site should form two power circuits, and the power distribution box and the lighting distribution box should be set separately.
4. All electrical equipment on the construction site must have their own dedicated switch box.
5. The cabinets and internal settings of distribution boxes at all levels must comply with safety regulations, switch appliances should be marked for use, and cabinets should be numbered uniformly. Discontinued distribution boxes should be powered off and locked. The fixed distribution box should be fenced and protected against rain and smashing.
6. The difference between distribution box and distribution cabinet. According to GB/T20641-2006 "General requirements for empty housings of low-voltage switchgear and control equipment"
The power distribution box is generally used for households, and the power distribution cabinet is mostly used in centralized power supply, such as industrial power and building power. The power distribution box and the power distribution cabinet are all complete equipment, and the power distribution box is a low-voltage complete equipment , Distribution cabinet has high voltage and low voltage.
Post time: Apr-18-2022