Safety Classes and Divisions
Class I Division 1
Safe to operate where flammable gases, vapors or liquids exist all or some of the time
Class I Division 2
Safe to operate where flammable gases, vapors, or liquids are not likely to exist
Class II Division 1
Safe to operate where combustible dust exist all or some of the time
Class II Division 2
Safe to operate where combustible dust is not likely to exist
Class III Division 1
Safe to operate where ignitable fibers and flyings exist all or some of the time
Class III Division 2
Safe to operate where ignitable fibers are not likely to exist
Class I
(Acetylene, Hyrdogen, Ethylene, Propane)
Paint Warehouse
Spray Booth
Offshore Oil Rig
(Hazard Likely)
(Hazard Not Likely)
Class II
(Metals[Div.1 only], Coal, Grain)
Munitions Factory
Grain Silo
Hay Storage Facility
(Hazard Likely)
(Hazard Not Likely)
Class III
(Machined Magnesium)
Woodworking Facility
Textile Mill
Cotton Gin
(Hazard Likely)
(Hazard Not Likely)
Division 1:
Where volatile substances can exist all of the time or some of the time under normal operating conditions.
Division 2:
Where volatile substances are not likely to exist under normal operating conditions.
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