Safety control requirements for plastic meter box:
1. Construction site low-voltage power supply system should be set up the total distribution box, distribution box and switch box, the implementation of three power distribution.
2. The total distribution box should be close to the power supply. The distribution box should be installed in areas where the electrical equipment is relatively concentrated.
3. Construction with electric power distribution and lighting distribution should be set in the box, when placed in the same plastic meter box, the power and lighting distribution should be set up.
4. Distribution box, plastic meter box should be used steel (thickness of 1.2 ~ 2.0mm) or flame retardant insulation materials.
5. Power distribution box, mcb distribution box installed in the power switch, should have a short circuit protection, overload protection, its rating and action settings should be adapted to its load.
6. The total distribution box (plastic meter box), the mcb distribution box must be installed leakage protector, the rated leakage action parameters should be selected to comply with the following provisions:
(1) the total distribution box leakage protection device rated leakage current should be 50 ~ 100mA, rated leakage action time should be greater than 0.1s.
(2) The leakage current of the leakage protection device in the mcb distribution box shall not exceed 30mA and the rated leakage action time should be less than 0.1s. When used in the wet place, the rated leakage current should not exceed 15mA, the rated leakage action time should be less than 0.1s.