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1. The outer surface of the distribution box casing is coated with silver-gray powder paint. Explosion-proof switch box flameproof joint surface 204-1 displacement type rust preventive oil.
2. The explosion-proof distribution box junction box insulation class II level of the gap is not less than 6, the creepage distance is not less than 10.
3. The explosion-proof distribution box shell material is made of cast aluminum alloy with a magnesium content of no more than 6% (mass percentage).
4. The explosion-proof power distribution shall be provided with internal and external grounding screws. The size of the internal grounding screw shall not be less than M6, and the size of the external grounding screw shall not be less than M8.
5. Explosion-proof distribution box shell shall be provided with a clear and permanent embossed sign “Ex†in obvious places. EX - is the general symbol of explosion protection, the abbreviation of English Explosionp-roof. With this mark, it means that the product is explosion-proof and can be used in specific hazardous locations. 6. The minimum width L and the maximum gap ic corresponding to the volume of the explosion-proof distribution box and the volume of the enclosure should comply with GB3836.2-2000. Class IIB is listed in Table 3 and Class IIC is specified in Table 4. The distance between the fastening bolt holes on the joint surface and the inside of the housing should be in accordance with 5.2.6 of GB3836.2-2000, and the average surface roughness Ra of the joint surface should not exceed 6.3. Μm.
7. The transparent part of the observation window of the distribution box is directly glued in the opening of the cover, and the shortest path from the inside to the outside of the flameproof enclosure through the adhesive joint is not less than 10.
8. All ferrous metal parts of the explosion-proof distribution box must have rust-proof measures, and the surface must not be coated off.
9. The operating handle of the explosion-proof distribution box must be flexible, reliable, and have a clear “point†and “close†sign.
10. The distribution box shall be equipped with a nameplate and a warning plate. Nameplates and warning plates shall be made of brass plates or other chemical-resistant materials.
11. If you need maintenance, use professional tools for repair.
The above describes the structural requirements of the explosion-proof distribution box. The following describes the maintenance of the explosion-proof distribution box.
1. First, disassemble the packaging of the explosion-proof distribution box, and carefully check the quantity and specifications according to the data identified in the design drawings and the specification, check whether the requirements are met, whether there is any damage or rust, and check whether the accessories are complete. If there is any damage, the location and degree of damage should be recorded, or photographed as proof.
2. After opening the box, check the technical documents such as the factory certificate, instructions and internal wiring diagrams. After the high-voltage power distribution box is unpacked, the distribution box number will be sequentially transferred to the substation installation location according to the design drawings for later installation.
3. After the explosion-proof distribution box is placed on the channel steel, use a thin horn to roughly adjust the level of the high-pressure tank, and use one of them as a benchmark to adjust the rest so that all the high-voltage cabinets have the same surface and even gaps. After the bolts are fixed, 2 to 3 gaps are maintained between the cabinets. Finally, the cabinets are permanently fixed to the base channel steel by using fixing bolts or welding methods. In order to be beautiful, the welds should be welded to the inside of the cabinet, and no less than four, each with a length of 80 to 100~. If the welding site or the distribution box is easily accessible, sharp or easy to cut the sharp point of the person, use a grinding machine or sandpaper, until the hand feels no obvious thorns can be felt.
4. Connect the bus. The main busbars and meters on the high-voltage power distribution cabinets are provided by switchgear factories and can also be produced at the construction site according to design drawings. The connection of the main busbars, the connection between the main busbars and the leading busbars, and the connection between the busbars and the meters shall be bolted. The busbar connection surface shall be coated with electric compound grease, the degree of tightening of the bolts, and the connection status of the connection surfaces shall be regulated by a torque wrench. Tighten the bolts to control the torque.
Structural requirements: