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| Hazardous Area Classifications Guide |
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| Classes |
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| Class I |
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Flammable gases or vapors are present in the air in quantities sufficient to produce explosive or ignitable mixtures. |
| Class II |
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Combustible or conductive dusts are present. |
| Class III |
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Ignitable fibers or flyings are present, but not likely to be in suspension in sufficient quantities to produce ignitable mixtures. (Group classifications are not applied to this class.) |
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| Divisions |
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| Division 1 |
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The substance referred to by class is present during normal conditions. |
| Division 2 |
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The substance referred to by class is present only in abnormal conditions, such as a container failure or system breakdown. |
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| Groups |
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| Group A |
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Acetylene |
| Group B |
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Hydrogen (or gases of equivalent hazard) |
| Group C |
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Ethylene (or gases of equivalent hazard) |
| Group D |
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Gasoline (or gases of equivalent hazard) |
| Group E |
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Metal Dust |
| Group F |
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Coal Dust |
| Group G |
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Grain Dust |
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