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NOTE: This is an unformatted excerpt from our online fire protection training library.

Classification Basics

Summary

Classification Basics

Areas are classified according to the types of ignitable materials and the likelihood that they will be present in ignitable mixtures and quantities. Flammable liquids, gases, and vapors produce Class I areas. Combustible dusts are the basis of Class II areas. Class III areas are based on the presence of ignitable fibers/flyings.

The degree of risk or the likelihood that a material will be present is the basis of Divisions, with Division 1 representing a higher degree of risk and Division 2 a lower degree of risk. Zone classification is an alternative classification method for Class I areas, where Zone 0, Zone 1, and Zone 2 represent, in order, decreasing degrees of risk.

The NEC defines classified areas, provides references to other documents for area classification, provides area classification for common types of occupancies, and provides installation requirements, but is not adequate for area classification in general. In many cases, documents and standards other than the NEC are necessary for classifying areas.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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