(1) The power distribution system for construction shall be equipped with general distribution box, distribution box and switch box, which shall be set in a hierarchical manner according to the sequence of "general-off-on" and form a "three-level power distribution" mode.

(2) The installation position of each distribution box and switch box of the construction power distribution system shall be reasonable. The main distribution box shall be close to the transformer or external power supply as far as possible to facilitate the introduction of power supply. The distribution box shall be installed in the area where the electric equipment or load is relatively concentrated as far as possible to ensure that the three-phase load is balanced. The installation position of the switch box shall be close to the controlled electrical equipment as much as possible according to the site conditions and working conditions.

(3) Let the three-phase load of the temporary power distribution system be balanced. The power and lighting power at the construction site shall form two power circuits, and the power distribution box and lighting distribution box shall be set separately.

(4) The electrical equipment on the construction site shall have their own special switch boxes.

(5) The box body and internal setting of distribution boxes at all levels shall meet the requirements. The switchgear shall be marked with purpose and the box body shall be numbered uniformly. The power supply shall be cut off and the door of the distribution box shall be locked. The fixed distribution box shall be fenced and provided with rain proof and smash proof measures.