The installation positions of all distribution box

1. The installation positions of all distribution boxes and switch boxes in the construction power distribution system shall be reasonably determined. The main distribution box should be placed as close as possible to the transformer or external power source to facilitate power supply introduction. Distribution boxes are advised to be installed in central areas with concentrated electrical equipment or loads, ensuring balanced three-phase loads. Switch boxes shall be positioned as near as practicable to the controlled electrical equipment, based on on-site conditions and working requirements.

2. All electrical equipment on the construction site must be equipped with dedicated switch boxes.

3. The construction power distribution system shall include a general distribution box, distribution boxes and switch boxes, which are to be arranged hierarchically in the sequence of "general-distribution-switch" to form a "three-level power distribution" mode.

4. The temporary power distribution system must maintain balanced three-phase loads. Power supply for machinery and lighting on the construction site shall form two separate circuits, with dedicated distribution boxes for machinery and lighting respectively.

5. The enclosures and internal configurations of all levels of distribution boxes must comply with safety regulations. Switchgear shall be clearly marked with their purposes, and all boxes shall be uniformly numbered. Unused distribution boxes must be disconnected from the power supply and locked. Fixed distribution boxes shall be enclosed with barriers and provided with rainproof and anti-impact protection.