There are two reasons for the ignition of combustible gas mixtures by electrical equipment: one is the sparks and arcs generated by the electrical equipment, and the other is the heating of the surface of the electrical equipment (i.e., the surface that is in contact with the combustible gas mixtures). For equipment in normal operation can produce arcs, sparks in the parts of the explosion-proof enclosure, or to take the pouring type, sand-filled, oil-filled or positive-pressure type and other explosion-proof type can achieve the purpose of explosion-proof. For increased safety electrical equipment is in normal operation will not produce arcs, sparks and dangerous high-temperature equipment, if the structure and then take some protective measures, try to make the equipment in normal operation or recognized overload conditions will not occur arcs, sparks and overheating phenomenon, you can further improve the safety and reliability of the equipment. Therefore, this equipment in normal operation there is no ignition source, but can be used in explosion-hazardous environments.
Simply put, explosion-proof lamps require more, from the materials used to the procurement of lamp beads, sealing, heat dissipation, certification, etc., and explosion-proof lamps are relatively expensive,