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After the explosion-proof distribution box is die-casted or welded, it must be electrostatically sprayed on the inner and outer surfaces of the box. The spray must be anti-corrosion wear-resistant insulating plastic powder. Welding non-standard distribution box must be careful and careful welding, using fixed Process equipment, post-weld annealing, reduce box deformation, and maintain the integrity and aesthetics of the explosion-proof distribution box. If the welding explosion-proof distribution box must be double-sided welding without meaning gaps, there can be no penetration trachoma or lack of welding, post-welding treatment must be scraped and smoothed. The external fasteners of the explosion-proof distribution box use stainless steel screws with hexagon sockets, and they must also be provided with flat washers and spring washers. This will allow the cabinets to be tightly fastened without any gaps.
According to the relevant national regulations, explosion-proof distribution boxes can be divided into the following categories: Category I (IA, IB, IC), Category II (IIA, IIB, IIIC), Category III (IIIA, IIIB, IIIC), etc. ,among them:
1. Class I explosion-proof distribution box equipment is used in coal gas gas environment. Note: Type I explosion protection type takes into account the ignition of methane and pulverized coal and the physical protection measures added to the underground equipment. Electrical equipment used in coal mines, when their environment may contain other explosive gases in addition to methane, shall be manufactured and tested in accordance with the requirements for Category I and Category II flammable gases. Such electrical equipment should have corresponding signs (for example: "ExdI/IIBT3" or "ExdI/II(NH3)".
2. Class II explosion-proof distribution box equipment is used for other explosive gas atmospheres other than coal mine methane gas. Class II electrical equipment can be further classified according to the type of explosive atmosphere it is intended to use. Reclassification of Class II electrical equipment: Class IIA: Representative gases are propane; Class IIB: Representative gases are ethylene; Class IIC: Representative gases are hydrogen.
3. Class III explosion-proof distribution box equipment is used in explosive dust environments other than coal mines. Class III electrical equipment may be further classified according to the characteristics of the explosive dust environment it is intended to use. Reclassification of category III explosion-proof distribution boxes: Category IIIA: Flammable floccules; Category IIIB: Non-conductive dust; Category IIIC: Conductive dust.
When the purchased explosion-proof distribution box arrives, first unpack the packaging of the explosion-proof distribution box, carefully check the quantity and specifications according to the data identified in the design drawings and instructions, check whether the requirements are met, and whether there is any damage or corrosion. , Check whether the accessories are complete. If there is any damage, the location and degree of damage should be recorded, or photographed as proof. After opening the box, check the technical documents such as factory certificate, manual and internal wiring diagram. After the high-voltage 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.
After the explosion-proof distribution box is placed on the channel steel, the high-pressure tank is roughly adjusted by using a thin horn, and then one of them is used as a reference to adjust the rest so that all the high-voltage cabinets have the same disk surface and uniform 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 not less than four, each with a length of 80 to 100. If the welding site or the distribution box is easily accessible to the site, sharp or easy to cut the sharp point of the person, the application of sander or sandpaper, until the hand feels no significant thorns can feel.
For more information on explosion-proof distribution boxes, please continue to pay attention to Zhejiang Enchuang Electric Co., Ltd.