(1) The power distribution system on the construction site should be equipped with indoor main distribution panel and distribution box or outdoor main distribution box and distribution box grading power supply, and the capacity of distribution devices at all levels should be matched with the actual load. Power and lighting should be set separately.
(2) distribution box, switch box production and installation should meet the following requirements: 0 distribution box made of iron plate or other fireproof insulation materials, so that ventilation, heat dissipation, rain prevention, fire prevention; ② All kinds of electrical appliances in the box should be installed on metal or other insulating board (non-wooden board) and fastened in the box. The metal bottom plate should be electrically connected with the box body; (3) the metal shell of the normal non-charged box, the base, etc., must be connected to zero (ground), and connected through a special terminal, and the protection of zero line terminal board. Each electrical connection wire should be insulated wire, reliable joint, not exposed; @ Inlet and outlet lines must use rubber insulated cables. The inlet and outlet lines should be located at the lower end of the box body with protective rings. The inlet (outlet) line shall be waterproof bent and shall not bear external force.
(3) the rating and action setting value of the electrical appliances of the main distribution box should be adapted to the rating and action setting value of the branch switch electrical appliances. And equipped with the total automatic switch, leakage protection device and branch automatic switch.
(4) Various electrical components and leakage protectors used in distribution boxes at all levels should meet the quality requirements of national standards.
(5) the leakage protector in the distribution box at all levels should be reasonably arranged to play the role of classification and section protection.
(6) Leakage protection device should be used in strict accordance with the product instructions, and regular tests and operation records. For idle for a long time and continuous use of more than a month, should be checked and tested, qualified can be used.
