The selection of explosion-proof lighting fixtures for hazardous areas should be based on the classification of the explosive hazard zone, the type of explosive mixture present, and its ignition group. Proper matching ensures both safety and compliance with local regulations.
In Zone 0 (which is considered the most dangerous), explosion-proof lighting must meet the highest standards. Currently, there are no commercially available products in China specifically designed for this area. Our team is developing specialized explosion-proof flashlights that incorporate a sealed light source cavity filled with oil and a battery compartment with built-in safety lines. The principle behind this design is to prevent accidental damage from impacts or drops, which could cause the bulb to break. The oil in the cavity helps rapidly cool the hot tungsten filament, reducing the risk of ignition. In some foreign countries, they use fiber-optic lighting systems specifically for Zone 0, where the explosion-proof light is guided into the hazardous area through a safe pathway.
For Zone 1 (which includes areas where explosive mixtures may occur under normal operation), explosion-proof lamps must be flameproof, increased safety, pressurized, or composite types. In China, some increased safety-type lamps are approved only for use in Zone 2 due to stricter maintenance requirements. This is partly because many Chinese factories and mines lack the infrastructure or trained personnel to maintain such equipment properly.
Zone 2 (where explosive mixtures are less likely to occur) includes both standard explosion-proof luminaires used in Zones 0 and 1, as well as non-sparking types specifically designed for Zone 2. Most hazardous areas fall into this category. Zone 2 has better air circulation, making gas accumulation less likely. Abroad, high-intensity discharge lamps and spark-free lighting systems are commonly used in these areas.
For dust explosion hazards, Zone 10 requires dust-tight enclosures to prevent dust ingress. In Zone 11, dust-tight enclosures are also recommended, while dust-proof enclosures are acceptable in areas where only combustible, non-conductive dust is present. These designs help reduce the risk of dust explosions by limiting the entry of flammable particles.
Proper selection and installation of explosion-proof lighting are essential to protect workers and facilities in hazardous environments. Always consult local regulations and follow manufacturer guidelines to ensure the right product is used in the correct location.
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