With the increasing popularity of explosion-proof electrical appliances, many explosive hazardous areas have installed and used explosion-proof electrical appliances. Many end users believe that as long as explosion-proof electrical appliances are installed in explosive hazardous areas, everything will be fine. In many cases, the so-called explosion-proof electrical appliances do not haveExplosion proof certificateOr the explosion-proof certificate may have expired or been forged, the nameplate may not match the explosion-proof certificate, the explosion-proof type selection may not comply, gas explosion-proof electrical equipment and dust explosion-proof electrical equipment may be mixed, the wiring of explosion-proof electrical equipment installation may be improper, the circuit may not be grounded, drilling holes or installing buttons on the explosion-proof shell may cause explosion-proof failure, and explosion-proof electrical equipment may be subjected to corrosion, high temperature, and intense vibration for a long time.
Regarding explosion-proof electrical appliances in use, the AQ 3009-2007 "Code for Electrical Safety and Explosion Protection in Hazardous Areas" standard stipulates that explosion-proof electrical appliances in use must be tested for their performance, installation, maintenance, etc. by a testing center with explosion-proof professional qualifications at least once every three years. Any non compliant items must be promptly rectified, and the inspection report and rectification situation must be filed with the safety production supervision and management department.
Conducting on-site inspections of explosion-proof electrical appliances in use is not only a requirement of the safety production department, but also a concern of the enterprise for its own life and property safety.
As mentioned earlier, regular inspections of explosion-proof electrical equipment in accordance with AQ 3009-2007 "Code for Electrical Safety and Explosion Protection in Hazardous Areas" must be conducted by a testing center with explosion-proof professional qualifications. This explosion-proof qualification is authorized by the China National Accreditation Service for Conformity Assessment (CNAS) and can be found on the CNAS website.
According to the strict regulations of relevant national laws, the explosion-proof labeling of explosion-proof electrical equipment should be standardized, and at the same time, obtain national certificationExplosion proof standardOnly after passing the inspection can it be implemented. Design appropriate explosion-proof types, explosion-proof levels, and temperature groups for electrical equipment based on specific working environments.
During the installation of electrical equipment, any carelessness can lead to potential losses. If the ventilation and exhaust system is not properly installed and not very smooth, there is also a possibility of explosions in the casing of electrical equipment during electrical operation. So when installing, we must strive for excellence and install according to relevant standards.
Electrical equipment is often composed of a large number of connected circuits, which are particularly complex. If the connections are not solid, or if there are incorrect connections, or if the insulation layer of the circuit falls off, it may cause short circuits or overloads, resulting in arcing or electric sparks. So, it is necessary to strengthen the inspection of the circuit, especially the sealing of the circuit, to ensure that the connection of the circuit meets the requirements.
Electrical equipment generates static electricity during operation. If there is too much static electricity, sparks may occur during discharge. Therefore, grounding protection measures should be taken to timely discharge the static electricity and prevent explosions. The usual grounding methods include three types: working grounding, electrostatic grounding, and lightning protection grounding. For engineers, it is necessary to choose the grounding method according to the specific working environment, and the grounding should be safe and firm.
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