LED explosion-proof lamp knowledge
Datetime: 2020-12-10 16:44:57
1. Selection of the location of the explosion-proof lamp circuit:
Electrical wiring should be laid at a location where the risk of explosion is small or where the release source is far away.
2. Selection of laying method of explosion-proof lamp circuit:
Electrical wiring in explosive environment mainly includes explosion-proof steel pipe wiring and cable wiring.
3. Isolation and sealing of explosion-proof lamp circuit:
The trenches for laying electrical circuits, protective pipes, cables or steel pipes should be tightly blocked with non-combustible materials when they pass through the partition walls or floor slabs between areas with different levels of explosive hazardous environment.
4. Selection of wire material for explosion-proof lamp circuit:
Within the scope of zone 1 of the explosion hazard environment, copper core wires or cables should be used for power distribution lines. Multi-strand copper-core flexible wire or multi-strand copper-core cable should be used where there is severe vibration. Aluminum core power cables shall not be used in coal mines.
Within the scope of zone 2 of the explosion hazard environment hazard level, the power line should use aluminum core wires or cables with a cross-sectional area of 4 mm2 and above, and the lighting line can use a cross-sectional area of 2.5 mm2. Aluminum core wire or cable above.
5. Allowable current carrying capacity of explosion-proof lamp circuit:
For the selection of insulated conductor cross-sections and cable cross-sections in zone 1, the allowable current carrying capacity of the conductor should not be less than 1.25 times of the rated current of the fuse melt and the set current of the circuit breaker long-time overcurrent release. The allowable current carrying capacity of the branch line leading to the low-voltage cage induction motor shall not be less than 1.25 times the rated current of the motor.
6. Connection of explosion-proof lamp electrical circuit:
The intermediate joints of the electrical circuits in Zone 1 and Zone 2 must be inside the explosion-proof junction box or junction box suitable for the hazardous environment. Explosion-proof junction box should be adopted in zone 1, and safety-increased junction box can be adopted in zone 2.
If aluminum-core cables or wires are used for the electrical circuits in Zone 2, they must be reliable to facilitate correct installation and maintenance by users.
LED explosion-proof lamps refer to lamps with various specific measures taken to prevent the ignition of surrounding explosive mixtures, such as explosive gas environments, explosive dust environments, and methane gas. It is a kind of explosion-proof lamp, and its principle is the same as that of explosion-proof lamp, except that the light source uses LED light source. LED explosion-proof lamps are currently the most energy-saving explosion-proof lamps, widely used in petrochemicals, coal mines, power plants, gas stations and other places.