The installation of explosion-proof electrical appliances needs to pay attention to more details. As the saying goes, "The embankment of thousands of miles collapses on the burrows of ants." Therefore, the importance of doing detailed work cannot be ignored.
1 wiring and wiring.
Explosion hazard environment mainly uses explosion-proof steel pipe wiring and cable wiring. Use thick-walled pipes as much as possible, and some may do pressure test.
2 position.
Electrical wiring should be laid at a location where the risk of explosion is small or distant from the source of release.
Electrical wiring should be laid along the external walls of buildings that are at risk of explosion;
When the dangerous gas or vapor explosion is heavier than air, the electrical circuit shall be laid at a high place, and the cable shall be buried directly or laid on the cable trench.
When the dangerous gas or vapor explosion is lighter than air, the electrical line should be laid at a low place, and the explosion-proof electrical cable should be laid with a cable trench.
The overhead lines below 10kV and 10kV shall not cross over the dangerous explosion environment; when the overhead line is adjacent to the explosion hazardous environment, the distance between them shall not be less than 1.5 times the height of the tower.
3 Selection of wire materials 1) Explosion Hazard Within the scope of Zone 1 of the Hazard Level 1, distribution lines shall use copper conductors or cables. Multiple stranded copper core cords or stranded copper core cables should be used where there is severe vibration. Aluminum core power cables must not be used underground in coal mines.
2) Explosion Hazard Within the scope of Zone 2 of the Environmental Hazard Class, the power lines shall use aluminum conductors or cables with a cross-sectional area of ​​4 mm2 and above, and the lighting circuit may use a cross-sectional area of ​​2.5 mm2. And above aluminum conductors or cables.
4 Allowable current-carrying capacity of explosion-proof electrical equipment in section 1 and zone 2 Selection of insulated wire cross-section and cable cross-section. The allowable ampacity of the conductor shall not be less than 1.25 of the rated current of the fuse melt rated current and the circuit breaker long delay over-current release Times. The allowable ampacity for the branch line leading to the low-pressure cage induction motor shall not be less than 1.25 times the rated current of the motor.
1 wiring and wiring.
Explosion hazard environment mainly uses explosion-proof steel pipe wiring and cable wiring. Use thick-walled pipes as much as possible, and some may do pressure test.
2 position.
Electrical wiring should be laid at a location where the risk of explosion is small or distant from the source of release.
Electrical wiring should be laid along the external walls of buildings that are at risk of explosion;
When the dangerous gas or vapor explosion is heavier than air, the electrical circuit shall be laid at a high place, and the cable shall be buried directly or laid on the cable trench.
When the dangerous gas or vapor explosion is lighter than air, the electrical line should be laid at a low place, and the explosion-proof electrical cable should be laid with a cable trench.
The overhead lines below 10kV and 10kV shall not cross over the dangerous explosion environment; when the overhead line is adjacent to the explosion hazardous environment, the distance between them shall not be less than 1.5 times the height of the tower.
3 Selection of wire materials 1) Explosion Hazard Within the scope of Zone 1 of the Hazard Level 1, distribution lines shall use copper conductors or cables. Multiple stranded copper core cords or stranded copper core cables should be used where there is severe vibration. Aluminum core power cables must not be used underground in coal mines.
2) Explosion Hazard Within the scope of Zone 2 of the Environmental Hazard Class, the power lines shall use aluminum conductors or cables with a cross-sectional area of ​​4 mm2 and above, and the lighting circuit may use a cross-sectional area of ​​2.5 mm2. And above aluminum conductors or cables.
4 Allowable current-carrying capacity of explosion-proof electrical equipment in section 1 and zone 2 Selection of insulated wire cross-section and cable cross-section. The allowable ampacity of the conductor shall not be less than 1.25 of the rated current of the fuse melt rated current and the circuit breaker long delay over-current release Times. The allowable ampacity for the branch line leading to the low-pressure cage induction motor shall not be less than 1.25 times the rated current of the motor.
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