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Articles 500 through 506 address areas that are considered hazardous – also called classified"Hazardous" is often used, but "classified" is the more technically correct term. – locations, based on flammable or combustible materials that are or may be present. These classifications are found in Section 500.1, the scope statement, and are very similar to the zone classification system found in Articles 505 and 506.Class designation is based on the presence of hazardous material: Class I – flammable gases, flammable liquid-produced vapors, combustible liquid-produced vapors
Division and Zone designations (Division 1 or 2; Zone 0, 1, 2, 20, 21 or 22) are based are based on the likelihood that classified material will be present in an ignitable form.
In addition, the specific chemical characteristics of the materials in Class I and Class II areas are used to specify the Group. For example, gasoline will often produce an area classification of Class I, Division 1 or 2, Group D.
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