Thread Content
I. In terms of equipment selection and installation, the type of explosion-proof electrical equipment chosen does not match the actual operating environment; for example, explosion-proof equipment designed for dust-filled environments is used in areas where flammable gases are present. The equipment is installed in an inappropriate location; for example, if it is placed in areas prone to impact, vibration, or high temperatures, this affects its explosion-proof capabilities. If it is not installed firmly, it may loosen during operation, compromising the equipment’s sealing. II. Shell and protection: The explosion-proof shell has obvious mechanical damage, deformation, or corrosion, which reduces its protective strength. The fastening bolts of the housing are incomplete, loose, or damaged. The aging or damage of the equipment’s seals reduces its protective capabilities, potentially allowing flammable and explosive substances to enter the equipment. The observation window is unclear, damaged, or poorly sealed. III. Regarding electrical connections, the cable entry points are not properly sealed; no appropriate explosion-proof sealing gaskets or clamping devices are used. Loose electrical connections, such as loose terminal fittings or poor wire contact, can generate electric sparks. If the cable’s outer insulation is damaged and the internal wires are exposed, it can easily lead to short circuits or electrical leaks. The electrical clearance and creepage distance between the conductive parts at different potentials do not meet the requirements. IV. Grounding and anti-static measures: The explosion-proof electrical equipment is not properly grounded, or the grounding resistance is too high. The cross-sectional area of the grounding wire is too small to meet the grounding requirements. Equipment at risk of generating static electricity does not have effective anti-static measures in place. V. Internal components and parts: Damage or aging of the electrical components inside the equipment, such as faults with circuit breakers, contactors, etc. Lighting components such as light bulbs and tubes do not meet the explosion-proof requirements. The insulation materials inside the equipment age and get damaged, resulting in a decline in their insulating properties. VI. Regarding signs and nameplates, the explosion-proof marks are unclear, missing, or incorrect. The information on the equipment’s nameplate is incomplete, making it impossible to accurately determine the equipment’s explosion-proof parameters and performance. VII. In terms of operation and maintenance, the equipment has been in use for a long time without regular inspections or maintenance. Inadequate tools or methods were used during maintenance, damaging the equipment’s explosion-proof properties. The identified potential hazards were not rectified in a timely manner. VIII. In terms of environmental adaptability, the equipment operates in harsh conditions such as humidity and dust, without appropriate protective measures in place. The ambient temperature is too high or too low, exceeding the device’s allowable operating range. IX. In terms of ventilation and heat dissipation, equipment that requires ventilation suffers from poor ventilation, resulting in excessively high internal temperatures. The cooling device is damaged or clogged, affecting the proper cooling of the equipment. X. Control system issues related to faults in the control circuits, such as malfunctions of relays, sensors, etc. The control system does not have the necessary safety interlock devices. XI. Regarding cable installation, the cables are not installed properly, resulting in interference with other pipes and equipment. No effective isolation measures were taken when the cable passed through different explosion-proof areas. XII. In terms of lighting and signaling, explosion-proof lighting fixtures are damaged, do not light up, or have insufficient brightness. The signaling device is malfunctioning and cannot emit alarms or signals properly. 13. Regarding plugs and sockets: Poor contact in explosion-proof plugs and sockets. The explosion protection rating of the plugs and sockets does not meet the requirements. 14. Regarding spare equipment, the spare explosion-proof electrical equipment has not been subject to regular inspection and maintenance. The improper storage environment for backup equipment affects its performance. 15. Unauthorized modifications to explosion-proof electrical equipment for the purpose of renovation or maintenance have damaged their explosion-proof properties. No strict explosion-proof performance testing was conducted after the repair. 16. The testing and inspection of explosion-proof electrical equipment were not carried out at the prescribed intervals. The testing and inspection agencies do not possess the necessary qualifications. 17. Regarding the explosion-proof joint surface: the explosion-proof joint surface is corroded, scratched, or uneven. The fastening bolts at the joint are loose. 18. Regarding the flameproof structure, the flameproof gap of the flameproof enclosure does not meet the requirements. There are debris in the flameproof chamber. 19. Oil level in oil-filled equipment: The oil level in oil-filled equipment is either too low or too high. The oil has aged and deteriorated. 20. Enhanced safety equipment: The heat resistance rating of the insulating materials in enhanced safety equipment is insufficient. The protection rating of the device’s enclosure is insufficient. 21. In intrinsically safe equipment, the intrinsically safe circuits and non-intrinsically safe circuits are not properly isolated. The parameters of the intrinsically safe device have changed and exceeded the allowable range. 22. The pressure of the positive-pressure enclosure in positive-pressure equipment is insufficient or too high. Failure of the ventilation system in the positive pressure system. 23. Dust explosion prevention equipment: The enclosure of the dust explosion prevention equipment has poor sealing. Dust inside the equipment has not been cleaned regularly. 24. In terms of gas detection, in areas at risk of flammable gas leaks, gas detection devices are not installed or the detection devices are malfunctioning. The alarm threshold settings of the gas detection device are not reasonable. 25. In terms of the classification of explosion-proof areas, inaccurate classification leads to incorrect selection and installation of equipment. Effective isolation measures have not been taken for non-explosion-proof equipment in explosion-proof areas. 26. Regarding personnel operation, the operators are untrained and unfamiliar with the usage methods and precautions for explosion-proof electrical equipment. Illegal operations, such as using non-explosion-proof tools in hazardous areas. 27. Regarding documents and records, there is a lack of technical documents for explosion-proof electrical equipment, as well as installation and commissioning records. No maintenance records for the equipment, nor records for identifying and addressing potential hazards, have been established. 28. In terms of signage and warnings, no obvious signs or warnings are provided in the explosion-proof area. The warning signs on the equipment are unclear or missing. 29. Regarding mobile devices: cables of mobile explosion-proof electrical equipment should not be laid on the ground or become entangled. The moving parts of the equipment are inadequately protected. 30. Regarding special environments, in areas with corrosive gases and liquids, the anti-corrosion measures for equipment are insufficient. In high-altitude areas, the equipment has not been adjusted accordingly for such conditions. 31. For equipment with interlock requirements in terms of electrical interlocking, the interlock function fails. The interlock device is not properly configured. 32. Regarding explosion-proof accessories, damage and aging of explosion-proof flexible hoses. The explosion-proof junction box is not properly sealed. 33. Equipment aging: The equipment has been in use for too long, resulting in a significant decline in its performance. The aging equipment was not updated in a timely manner. 34. In terms of water resistance, the equipment lacks sufficient waterproofing and is prone to water intrusion in humid environments. The waterproof seal is damaged. 35. Regarding explosion-proof lighting fixtures, the lamp covers of such fixtures may crack or become loose. The improper installation angle of the lighting fixtures affects the lighting effect. 36. Regarding explosion-proof motors: bearing wear and overheating in explosion-proof motors. The fan of the motor is damaged, resulting in poor heat dissipation. 37. Regarding explosion-proof switches, the operating mechanism of these switches is not flexible. The contacts of the switch are not in good contact. 38. Regarding explosion-proof instruments, the readings of these instruments are inaccurate. The protection rating of the instrument is insufficient. 39. Regarding explosion-proof distribution boxes, the arrangement of electrical components inside these boxes is unreasonable. The door of the distribution box does not seal properly. 40. Regarding explosion-proof plug and socket assemblies, deformation of the pins and sockets. The contact resistance of the plug and socket is too high. 41. Regarding the explosion-proof control box, the wiring inside it is in disarray. The protection level of the control box is insufficient. 42. Regarding explosion-proof ventilation equipment, the air volume of such ventilation devices is insufficient. Motor failure in the ventilation equipment. 43. Regarding explosion-proof heating equipment, the temperature control of such equipment fails. The heating element is damaged. 44. In terms of explosion-proof refrigeration equipment, refrigerant leakage from such equipment. Compressor failure in refrigeration equipment. 45. Regarding explosion-proof communication equipment, the signals from such equipment are unstable. The explosion-proof performance of the communication equipment does not meet the requirements. 46. In terms of explosion-proof sensors, the measurement accuracy of these sensors decreases. The explosion-proof housing of the sensor is damaged.