1. Combiner box shall have name, purpose, shunt mark and system wiring diagram.

2. The door of Combiner box shall be equipped with lock and shall be in charge of by special personnel.

3. The combiner box shall be inspected and maintained regularly. The inspection and maintenance personnel are professional electricians; they should wear insulating shoes according to regulations. Gloves, use electrical insulation tools, and make inspection and maintenance records.

4. During the regular maintenance and inspection of the switch box, the corresponding power isolating switch of the previous level shall be opened and cut off, and the power-off signboard of "no switching on, someone working" shall be hung, and live working is strictly prohibited.

5. The combiner box and switch box shall be operated in the following order:

1. Power transmission operation sequence: general distribution box, combiner box, switch box;
2. The power cut operation sequence is: switch box combiner, general distribution box.

However, the emergency of electrical failure may be excluded.

6. When the construction site stops working for more than 1 hour, the power switch box shall be cut off and locked.

7. No sundries shall be placed in the switch box and shall be kept clean and tidy.

8. The combiner box shall not be connected with other electrical equipment at will.

9. It is strictly forbidden to change the electrical configuration and wiring in the combiner box at will.

When replacing the fuse, it is forbidden to replace the fuse with one that does not conform to the original specification. Before using the leakage protector every day, the leakage test button should be activated to try to trip once. If the test trip is abnormal, it is forbidden to continue to use it.

10.The incoming and outgoing lines of the combiner box are strictly forbidden to bear external forces, and are strictly prohibited to contact with metal sharp fracture, strong corrosive medium and inflammable and explosive materials.