Explosion-proof distribution box set requirements

2. The power distribution box and the lighting distribution box should be set separately. If they are placed in the same distribution box, the power and lighting circuits should be set apart. The switch box should be distributed by the final distribution box.

3, the total distribution box should be set in the area near the power supply, distribution of electrical boxes should be located in areas with relatively concentrated power equipment and load. The distance between distribution box and switch box shall not exceed 30m. The horizontal distance between the switch box and the power equipment it controls should not exceed 3m.

4. The distribution box and the switch box shall be installed in dry, ventilated and normal temperature places. There shall be enough space and channels for two people to operate at the same time. Do not stack any items that impede operation and maintenance, and shall not have shrubs and weeds.

5. The distribution box and switch box should be made of iron plate or high-quality insulating material. The thickness of the iron plate should be greater than 1.5mm. The distribution box and switch box should be installed with correct and firm, mobile distribution box and switch box should be installed. Located on a sturdy stand; the vertical distance between the bottom of the fixed distribution box and the switch box and the ground should be greater than 1.3m, less than 1.5m, and the vertical distance between the bottom of the mobile distribution box and the switch box and the ground should be Greater than 0.6m, less than 1.5m.

6, distribution boxes, switch boxes must be rain, dust.

Distribution box internal set requirements

1. The electrical switch inside the box shall be fastened to the mounting plate according to regulations. It shall not be skewed or loosened. The box shall be kept clean and no debris shall be piled up.

2. The working neutral line in the box should be connected through the terminal board, and should be separated from the protection zero line terminal board.

3. Insulated cables shall be used for the connection cables inside the box. The connector shall not be loosened and no live parts shall leak. The cabinet, the electrical installation board inside the box, and the enclosure must be protected and connected. Zero protection should be connected through the terminal strip. Requirement: The inner conductors of the box are well-insulated, neatly arranged, and firmly fixed. The ends of the wires should be bolted or crimped.

4. Electrical equipment such as contactors, switches and switches installed in the box shall be flexible in operation, good and reliable in contact, and no serious ablation of the contacts.

5, the total distribution box should be installed with a total isolation switch, the total fuse and shunt isolation switch, the total fuse and shunt fuse (or total automatic switch and shunt isolation switch), leakage protection. If the leakage protector has overload and short circuit protection at the same time, no branch fuse or shunt automatic switch can be provided. The rated value and operation setting value of the main switchgear shall be compatible with the setting values ​​and action setting values ​​of the shunt switchgear.

6, the total distribution box should be installed voltmeter, ammeter, total power meter and other instruments.

7. The distribution box shall be equipped with the main isolating switch and the shunt isolation switch as well as the main fuse and the shunt fuse (or the total automatic switch and the shunt isolation switch). The rated value and operation setting value of the main switchgear shall be compatible with the rated value and action setting value of the shunt switchgear.

8. Each power-using equipment should have its own dedicated switch box and must implement "one brake and one brake." The switchgear inside the switch box must be able to use electrical equipment for power isolation under all circumstances.

9. All electrical equipment in the construction site must be equipped with a leakage protector at the head of the equipment load line. The rated operating current of the leakage protector in the switch box should be no more than 30mA, and the rated leakage operating time should be 0.1S.

10. The entrance and exit of the wire in the distribution box and switch box should be set under the box. The incoming and outgoing cables should be sheathed and shunted and waterproof bended. The wire harness must not enter and exit the box. Directly in contact with the mouth, rubber-insulated cables must be used for the entry and exit lines of mobile distribution boxes and switch boxes. The power cable that enters the switch box must not be connected with a latch.