Explosion Proof Lights are typically Class I, Division 1 rated. They must prevent high voltage and amperage components from becoming an ignition source. A heavy enclosure surrounds the spark producing components. If vapors or gas leak in and ignite, the mechanism impedes hot gases from passing through. Yet, allows the flow of cold gases through joints.

Hazardous Location Designated Areas :In North America, hazardous locations are a combination of classes, divisions and zones. 

Class & Divisions System (Canada & US Only):

Class I, Division 1 - Where ignitable concentrations of flammable gases, vapours or liquids can exist all of the time or some of the time under normal operating conditions. 

Class I, Division 2 - Where ignitable concentrations of flammable gases, vapours or liquids are not likely to exist under normal operating conditions.

Class I Groups - A- Acetylene, B - Hydrogen, C - Ethylene, D - Propane

Class II, Division 1 - Where ignitable concentrations of combustible dusts can exist all of the time or some of the time under normal operating conditions.

Class II, Division 2 - Where ignitable concentrations of combustible dusts are not likely to exist under normal operating conditions.