2. Power distribution box and lighting distribution box should be set up separately, such as combined in the same distribution box, power and lighting lines should be set up separately.
3. The switch box should be distributed by the last sub-distribution box.
4. The main distribution box should be located near the power area. Sub-distribution box should be installed in the area where the power-using equipment or load is relatively concentrated. Distribution box and switch box distance shall not exceed 30 m. Switch box and its control of fixed electrical equipment horizontal distance should not exceed 3 m.
5. Distribution box, switch box should be installed in dry, ventilated and room temperature places; shall not be installed in the role of serious damage to the gas, smoke, vapors, liquids, and other hazardous media. It shall not be installed in the place where it is easy to be hit by foreign solids, strong vibration, liquid splash and heat source baking. Otherwise, special protective treatment must be made.
6. Distribution boxes, switch boxes should be enough around the two people working at the same time space and access. Shall not pile up any obstacles to the operation and maintenance of the items; no bushes, weeds.
7. Distribution box, switch box should be made of iron plate or high-quality insulating materials, the thickness of the iron plate should be greater than 1.5m.
8. Distribution box, switch box should be installed correctly, firmly, mobile distribution box, switch box should be installed on a solid support fixed distribution box, switch box bottom and the ground should be greater than the vertical distance of 1.3m, less than 1.5m, the mobile distribution box, switch box bottom and the ground should be greater than 1.3m, less than 1.5m, the mobile sub-distribution box, switch box bottom and the ground should be greater than 1.3m, less than 1.5m, mobile distribution box. Distribution box, switch box, the vertical distance between the bottom and the ground should be greater than 0.6m, less than 1.5m.
9. Electrical appliances in the distribution box should be installed first in non-metallic or wooden insulated electrical mounting plate, and then the whole fastened in the distribution box box, the metal plate and the ferrous distribution box box should be made electrical connection.
10. The switching appliances in the distribution box and switch box should be fastened on the electrical mounting plate according to the specified position without mentioning skewing and loosening.
11. The working zero line in the distribution box and switch box should be connected through the terminal board, and should be separated from the protective zero line terminal board.
12. The distribution boxes and switch boxes should be connected with insulated wires, and the joints should not be loose, and there should be no exposed energized parts.
13. Distribution boxes and switch boxes metal box, metal electrical installation boards and electrical appliances in the box should not be charged base, shell, etc. must be made to protect zero. Protective zero line should be connected through the terminal board.
14. Distribution boxes, switch boxes must be rainproof, dustproof.
15. Electrical appliances in the distribution boxes and switch boxes must be reliable and intact, and the use of damaged and unqualified electrical appliances is not allowed.
16. The total distribution box and sub-distribution box should be installed with total isolation switch and branch isolation switch, total fuse and branch fuse (or total automatic switch and branch automatic switch) and leakage protector. If the leakage protector has both overload and short-circuit protection function, it can not be equipped with branch circuit fuse or branch circuit automatic switch. The rating of the total switch appliance, the action of the rated value should be compatible with the rated value of the split switch appliance, the action of the rated value.
17. The total distribution box should be equipped with voltmeter, total ammeter, total meter and other instruments.
18. Each power equipment should have their own special switch box, must implement the "one machine, one gate, one protection" system, it is strictly prohibited to use the same switch to directly control more than two power equipment.
19. Switch box switching appliances must be able to use the electrical equipment in any case to implement power isolation.
20. switch box must be installed leakage protector, leakage protector should be installed in accordance with the requirements. 36V and the following electrical equipment, such as dry working environment can be exempted from installing leakage protector.
21. Leakage protector should be installed in the load side of the power disconnect switch of the distribution box and the load side of the power disconnect switch of the switch box.
22. leakage protector selection should be consistent with the national standard GB6829-86 "leakage current action protector (residual current action protector)" requirements, the switch box leakage protector rated leakage action current is not greater than 30mA, rated leakage action time is less than 0.1s; used in wet and corrosive media leakage protector should be used in the place of splash-proof type products, and its rated leakage action current should not be greater than 0.1mA. Rated leakage action current should not be greater than 15mA, the rated leakage action time should be less than 0.1s.
23. Distribution boxes and switch boxes in the two levels of leakage protector rated leakage action current and rated leakage action time should be reasonable with the function of hierarchical segmentation protection.
24. Leakage protector must be installed according to product instructions, use. Shelved for a long time to re-use and continuous use of one month leakage protector, should carefully check its characteristics, found that the problem of timely repair or replacement.
25. Manual switching appliances are only allowed to be used for direct control of lighting circuits and power circuits with a capacity of not more than 5.5KW. Capacity greater than 5.5KW power circuits are controlled by automatic switching appliances or reduced voltage starting device.
26. The ratings of the various switching appliances should be adapted to the ratings of the power equipment they control.
27. Distribution boxes, switch boxes in the wire inlet and outlet should be located in the box at the bottom of the bottom surface, it is strictly prohibited to be located in the box on the top surface, side, behind or at the door of the box; inlet and outlet wires should be sheathed into a bunch of split and waterproof bending, wire bundles shall not be in direct contact with the box into and out of the box; mobile distribution boxes and switch boxes inlet and outlet wires must be used to rubber-insulated cables.
28. The power line into the switch box, it is strictly prohibited to use the plug connection.
29. All distribution boxes should be labeled with its name, purpose, and make a split mark.
30. The door of all distribution boxes should be equipped with locks, and the distribution boxes and switch boxes should be under the responsibility of specialized personnel.
31. All distribution boxes and switch boxes should be inspected and maintained once a month. Inspection and maintenance personnel must be a professional electrician. Inspection and maintenance must be in accordance with the provisions of wearing insulated shoes, gloves, must use electrician insulated tools.
32. When checking and repairing the distribution box and switch box, the corresponding power switch of the previous level must be disconnected, and hang the blackout signboard, and it is strictly prohibited to work with electricity.
33. All distribution boxes, switch boxes in the process of using the power delivery order: total distribution box - sub-distribution box - switch box; blackout operation order: switch box - sub-distribution box - total distribution box (except for emergencies when there is an electrical fault).
34. When the construction site stops operation for more than one hour, the power switch box should be disconnected and locked.