The reason why explosion-proof LED light fixtures can work for a long time also depends on the continuous and stable operation of their supporting power supply. The quality of the power supply is the bottleneck of the development of LED lighting technology. Therefore, the optimal design of the power supply is indispensable.

Ⅰ. Explosion-proof LED lighting circuit description

1. Location selection

Circuits should be located where there is relatively little risk of explosion or away from sources of ignition.

2. Wire laying method

The choice of line laying method in explosive hazardous environment is mainly explosion-proof steel pipe wiring and cable wiring.

3. Isolation and sealing

circuit and protection tube. When the cable or steel pipe layer passes through the partition wall or flat plate between different levels of explosion hazard areas, non-combustible materials should be tightly sealed.

4. Selection of wire material

The power distribution line in Zone 1 of the explosion hazard environment hazard level should be copper wire or cable. In case of severe vibration, multi-strand copper-core cable or multi-strand copper wire should be used. Aluminum core power cables shall not be used underground in coal mines. Within the scope of Zone 2 of the explosion hazard environment, the power cord should be made of aluminum core wire or cable with a cross-sectional area of 4mm² and above, and the cross-sectional area of the lighting wire should be 2.5mm².

5. Allowable current carrying capacity

For the selection of insulated wire sections and cable sections in Zones 1 and 2, the allowable current carrying capacity of the wire should not be less than 1.25 times the rated current of the fuse and the set current for long-time overcurrent release of the circuit breaker. The allowable current carrying capacity of the low-voltage squirrel cage asynchronous motor branch shall not be less than 1.25 times the rated current of the motor.

6. Circuit connection

Circuit intermediate connections for Zones 1 and 2 must be close to an explosion-proof junction box or a junction box compatible with hazardous environments. Zone 1 should use a fire rated junction box, and Zone 2 can be used to increase the type of junction box. If aluminum core cables or wires are used for the 2-area circuit, they must be reliable and easy for users to install and maintain.

Ⅱ. Precautions for the use of explosion-proof light fixtures

Regularly remove the dust and dirt on the explosion-proof light fixtureshade to improve the luminous efficiency and heat dissipation performance of the bulb. Depending on the protective power of the lampshade, the cleaning method can be water (shaded markings on the lamp) or wipe with a damp cloth. When spraying water, the power supply should be cut off, and it is strictly forbidden to clean the plastic case (transparent) with a dry cloth to prevent static electricity.

Check whether the traces of the transparent parts are affected by foreign objects, and whether the protective net is loose, desoldered, corroded, etc. If so, it should be stopped in time for repair and replacement.

If the light source is damaged, turn off the light in time and notify the replacement to prevent the light source from putting the ballast and other electrical components in an abnormal state for a long time.

The bulb cavity adopts a humid environment. If moisture is to be removed in time, replace the seal to ensure the protective performance of the enclosure.

After opening the lid, the surface of the fire joint should be completely inspected. Rubber seals should be hardened or sticky. The wire insulation should be green carbon. Insulation and electrical components should show signs of warping and charring. If these problems are found, they should be replaced in time.

In the case of applying a damp cloth (not too wet), apply the lampshade, lighting, lighting and transparent parts to improve the luminous efficiency of explosion-proof light fixtures. When covering the seal, attention should be paid to whether the seal is sealing in its original position.