Hazardous Location & Explosion-Proof Lighting Guide
In spaces with flammable vapor, dust, or fibers, an ordinary fixture can be an ignition source. Hazardous-location lighting is engineered and rated to prevent that. This guide explains the classifications and where rated fixtures are required.
Hazardous (classified) locations are defined by the NEC using Classes, Divisions, and Zones. Fixtures in these areas must be listed for the specific classification, and a standard fixture is not acceptable.
Understanding the Classes
- Class I: flammable gases or vapors (fuel, solvents).
- Class II: combustible dust (grain, metal, chemical).
- Class III: ignitable fibers and flyings.
- Divisions and Zones describe how often the hazard is present.
The right fixture rating depends on the exact class, division, and material. Always confirm the classification with a qualified engineer or inspector.
Where Rated Fixtures Are Required
- Paint spray booths and mixing rooms (NFPA 33, NEC 516).
- Areas around fuel dispensers.
- Grain, chemical, and certain processing areas with combustible dust.
Choosing Compliantly
Do not guess. Get the area classified, then select fixtures listed for it. For wet but non-classified areas, sealed vapor-tight fixtures are different from explosion-proof; know which you need.
Light Hazardous Areas Safely
We carry fixtures rated for classified locations. Confirm your classification and we will match it.
Shop Hazardous Location Lighting Call (512) 843-1383Last updated: June 2026. Consult local codes and a licensed professional for your specific project.
