What should I pay attention to when selecting the material of the explosion-proof distribution box?

What should I pay attention to when selecting the material of the explosion-proof distribution box?

What should you pay attention to when using an explosion-proof distribution box?

1. The main power distribution box, distribution electric box and switch box should be set up for the construction power distribution system, and set in the order of “total-minute-open”, and form the “three-level power distribution” mode.

2. The installation location of each distribution box and switch box of the construction power distribution system should be reasonable. The total distribution box should be as close as possible to the transformer or external power supply for the introduction of the power supply. The distribution box should be installed in the central area where the power equipment or load is relatively concentrated, to ensure that the three-phase load is balanced. The location of the switch box installation should be as close as possible to the electrical equipment it controls, depending on the site conditions and operating conditions.

3. Ensure the three-phase load balance of the temporary power distribution system. The power consumption and lighting power of the construction site should form two power circuits. The power distribution box and the lighting distribution box should be set separately.

4. All electrical equipment on the construction site must have their own dedicated switch boxes.

5. The cabinet and internal settings of the distribution boxes of all levels must comply with the safety regulations. The switchgear should be marked for use, and the cabinets should be numbered uniformly. The power distribution box that has been discontinued should be powered off and the door locked. Fixed distribution boxes should be fenced and protected from rain and flood.

6. The difference between distribution box and power distribution cabinet. According to GB/T20641-2006 "General requirements for low-voltage switchgear and control equipment empty housing" Note: On the spot, not only the door has disappeared, but also the switch is in the "ON" state, a total of 6 cables are exposed There are no warnings posted on it. Because the distribution box is located about 50 meters north of the south bridge of the Aerospace Bridge, and is located at the southeast corner of the roundabout, the passing people are constantly flowing and the traffic is very large.

Explosion-proof distribution box refers to a type of distribution box with explosion-proof performance. There are mainly explosion-proof lighting distribution box, explosion-proof power distribution box, explosion-proof anti-corrosion distribution box, explosion-proof control box, explosion-proof power distribution cabinet, explosion-proof lighting power distribution box and so on. BXM(D) explosion-proof distribution box is suitable for: lighting in flammable and explosive places such as petrochemical plants, oil platforms, gas stations, oil pump rooms and transfer stations. Explosive gas environment in Zone 1 and Zone 2. Combustible dust environment in Zone 21 and Zone 22. When installing an explosion-proof power distribution box, there are some main problems that require special attention.

1. The wire inlet and outlet of the explosion-proof distribution box shall be located on the lower bottom of the box. Try not to be placed on the top surface, side, back or box door of the box; incoming and outgoing lines shall be protected. The bundles are bundled and made waterproof; the bundles must not be in direct contact with the inlet and outlet of the cabinet; the power cables entering the switch box are strictly prohibited to be connected by bolts; the inlet and outlet lines of the mobile distribution box and switch box must be used. Rubber insulated cable.

2. The connecting wire in the explosion-proof power distribution box is insulated wire, the joint is not loose, and there is no exposed live part; the working zero line in the distribution box and switch box should be connected through the terminal block, and the protective neutral terminal block is divided. The metal box of the distribution box, the switch box, the metal electrical installation board, and the non-charged metal base and casing of the electrical equipment in the box must be protected and connected to zero. The protection neutral line should be connected through the terminal block.

3. The explosion-proof distribution box and switch box should be installed in a ventilated, dry and normal temperature place. It is strictly forbidden to be installed in gas, smoke, steam, liquid and other harmful media with serious damage, and should not be installed in places susceptible to impact, vibration, liquid splashing and heat source baking; around distribution box and switch box There should be enough space and passage for two people to work at the same time. Do not stack any items that hinder operation and maintenance, and do not have weeds or shrubs.

4. The explosion-proof distribution box should be made of iron plate, aluminum shell, stainless steel plate or high-quality insulating material. The thickness of the aluminum plate should meet the requirements of the national standard: 4 thick; the electrical appliances in the distribution box should be installed first in metal or non-wood insulated electrical appliances. The board is mounted on the board and then integrally fastened in the power distribution box; the metal board and the power distribution box should be electrically connected.

5. Explosion-proof power distribution box and explosion-proof lighting distribution box should be set separately. If they are placed in the same distribution box, the power and lighting lines should be set separately.

6. The distribution system of the construction site shall be distributed and distributed. The total distribution box (or distribution room) shall be set up. The distribution box shall be set below the main distribution box. The switch box shall be set below the distribution box. The switch box is below Electrical equipment.

7. The distribution box and switch box should be installed firmly and correctly. The mobile distribution box and switch box should be installed on the solid bracket. The vertical distance between the lower bottom of the fixed distribution box and the switch box and the ground should be greater than 1.3m, less than 1.5m; 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; all distribution boxes and switch boxes must be protected from rain and dust.

8. The main distribution box should be located in the area close to the power supply; the distribution electric box should be installed in the area where the electric equipment or load is relatively concentrated; the distance between the distribution electric box and the switch box must not exceed 30m. The switch box should be from the last stage. The distribution distance between the switch box and the fixed-type power equipment controlled by it shall not exceed 3m.

9. Usually, the customer's requirements for the appearance of the explosion-proof distribution box may focus on the color problem and the uniformity of the surface. In fact, this requirement is also the requirement of our distribution box manufacturer for the distribution box produced by ourselves. The color we will carry out electrostatic spray according to the actual needs of customers.

10, the coating should be firmly attached, uniform color, no wrinkles, peeling, spots, leakage and other undesirable phenomena, no obvious color difference and reflection at a distance of 1 meter, the surface is flat, clean, no pits, scratches and other damage . Other coated parts used in the box should also ensure that there are no defects such as peeling, spots, leakage plating, rust, etc., and the appearance quality should meet the same requirements as above. The distribution box shall be clean. Except for the information and spare parts that should be provided to the user and the accessories required by other national regulations, there shall be no debris or dust in the distribution of the box.

11. Explosion-proof distribution box manufacturers' conditions on the appearance of the distribution box and the mechanical requirements of the distribution box. The thickness of the steel plate used for the distribution box body is not less than 1.5mm, and the cabinet of the power distribution cabinet is made of cold-rolled steel plate with a thickness of not less than 2.0mm. The thickness of the steel plate door and steel plate is not less than 2.0mm, and the thickness of the back plate is not less than 3.0mm, the rails must be strong, and the structure of the power distribution cabinet should be complete and sturdy. At the same time, two bearing ears are welded on the lower left corner and the upper right corner of the back of the non-floor power distribution box. The bearing ears are made of 40X4 flat steel, and the length of the flat steel is 10CM.

12. A series of problems that appeared in the later stage of the explosion-proof distribution box were actually related to the components in our distribution box and the installation of the distribution box, facing a series of problems in the later stage of the distribution box. We need to do the appropriate preparations as soon as possible.

13. The components in the distribution box have been neatly arranged, arranged in order, and there is no dust, water and debris in the distribution box, and if it is a floor-mounted distribution box, our bottom surface should be higher than the ground 50 -100mm, the height of the center of the operating handle is generally 1.2-1.5m; the height of the distribution box (cabinet) is 0.8-1.2m. There shall be no bare electric discharge outside the distribution box (cabinet); electrical components that must be installed on the outer surface of the distribution box (cabinet) or on the distribution board must have reliable screen protection.

14. Shut off the circuit or alarm with the help of the protective device during fault or abnormal operation. The measuring instrument can display various parameters during operation, and can also adjust some electrical parameters to prompt or signal the deviation from the normal working state. Commonly used in various power stations, power distribution stations, substations. Once our distribution box has operational obstacles, we must make the appropriate measures as early as possible to ensure that components are not damaged.