Explanation of relevant knowledge of LED explosion-proof lamp circuit
Datetime: 2021-03-09 10:34:39
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 and protective pipes, cables or steel pipes shall be tightly blocked with non-combustible materials when passing through partition walls or floor slabs between areas with different explosive hazardous environment levels.
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 4mm2 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 the insulated conductor cross-sections and cable cross-sections of 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 long-time overcurrent release of the circuit breaker. 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 of 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 in the vicinity of the explosion-proof junction box or the 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 the correct installation and maintenance by the user.