The distribution box (cabinet) is applicable to the construction site and outdoor temporary power consumption, and shall meet the use requirements of "three-level distribution, two-level leakage protection, one machine, one switch, one leakage and one box". The material selection, manufacturing process, selection and configuration of electrical components in the distribution box (cabinet) and switch box shall comply with relevant national standards and the regulations of the Ministry of construction on the promotion and application technology in the eleventh five year plan, and the products shall pass CCC certification.
The layout of distribution room shall meet the following requirements:
（1） The width of the operation channel on the front of the distribution cabinet shall not be less than 1.5m for single row arrangement or double row back-to-back arrangement, and not less than 2m for double row face-to-face arrangement;
（2） The width of maintenance channel behind the distribution cabinet shall not be less than 0.8m for single row arrangement or double row face-to-face arrangement, and not less than 1.5m for double row back-to-back arrangement. If there are protruding places of building structure in some places, the channel width at this point can be reduced by 0.2m;
（3） The width of maintenance channel on the side of distribution cabinet shall not be less than 1m;
（4） The distance between the ceiling of the distribution room and the ground shall not be less than 3m.
The erection of distribution box shall meet the following requirements:
（1） The vertical distance between the center point of fixed distribution box and switch box and the ground is 1.4-1.6m. The vertical distance between the mobile box and the ground is 0.8-1.6m. The distribution box and switch box shall be installed on a firm and stable support.
（2） If the distribution box and switch box are within the falling radius of the building or the rotation radius of the tower crane arm, a double-layer protective shed must be built, and isolation measures must be taken.