What are the acceptance specifications for explosion-proof electrical equipment?

Code for acceptance of explosion-proof electrical equipment: 1. Only when the grade and group of explosion-proof electrical equipment meet the use environment conditions can safety be guaranteed. According to the new product standard of explosion-proof electrical equipment, the electrical equipment used under the specified conditions and the electrical equipment with low impact energy are marked with the special symbol "X" after the explosion-proof certificate number. In addition, products designed for specific environmental conditions have specific symbols in the product model suffix, such as products used in outdoor environments. Environmental products in hot and humid areas: products used in moderately corrosive environments -FI and other signs. Please pay attention when installing. 2. According to the current national standard "Explosion-proof Electrical Equipment for Explosive Environment" (GB 3836. 1-83), explosion-proof electrical products can only be produced after obtaining explosion-proof certificate. The explosion-proof certificate number is the proof that the explosion-proof performance of the equipment has passed the inspection by the inspection unit designated by the state. The type, grade and group of explosion-proof electrical equipment and the "EX" sign on the shell are important features of explosion-proof electrical equipment, which need to be ascertained before installation. 3. The bracket can be fixed by embedding, expanding bolts, nylon plugs, plastic plugs and welding. In the construction and installation of specific projects, you can refer to the provisions of the Atlas of Installation Standards for Explosion-proof Electrical Equipment, but the fixation should be firm. In order to prevent the strength of steel structure from decreasing, spot welding should be carried out when welding and fixing. 4. After the electrical equipment junction box is fastened internally, if the electrical gap and creepage distance are too small, it is easy to cause accidents due to arc and spark discharge. Electrical clearance and creepage distance are one of the effective measures to ensure safety and prevent accidents, which need to be checked. According to a chemical plant, many years of electrical accident statistics show that most accidents occur in the junction box of electrical equipment. The values listed in Appendix A are in accordance with the new national standard and international standard 1993, and the values under low voltage are increased, and the application of low-grade insulation materials is cancelled, and only the first three materials with good leakage resistance are used. 5. For safety reasons, cables or wires should be connected reliably and sealed well after being introduced into the equipment. According to the convenience of production and use, some products are provided with multiple air inlets, but in order to maintain explosion-proof performance or waterproof and dustproof ability, the redundant air inlets are sealed. 6. Maximum allowable surface temperature of electrical equipment. According to its use environment, the current national standard for equipment manufacturing products has revised it into six groups, among which the safety-increased and spark-free equipment also includes the highest temperature inside the equipment. 7. There are many kinds of plastic products, some of which are not resistant to solvent erosion. It is recommended to use household detergent for cleaning. 8. It is an important guarantee and main measure to install an accident exhaust fan in an explosive dangerous environment and ventilate in time to reduce the concentration of explosive gas. In order to start the exhaust fan in time in case of an accident, it is required that the button of the exhaust fan on site be installed in a place convenient for operation, and it should be eye-catching and easy to operate. 9. Because the variety, model and power of lamps and lanterns can change their heating state, it is emphasized that lamps and lanterns should meet the design requirements and shall not be changed at will. When rotating the bulb, it should be tightened and not loosened to prevent sparks and poor contact caused by overheating. The lampshade should be installed as required, and the bolts should be tightened. It has happened before that the lampshade was not reinstalled after replacing the light bulb, so special attention should be paid here.