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The National Fire Protection Association (NFPA) and the American Petroleum Institute (API) publish the generally recognized sources for determining hazardous areas.
NFPA has a complete series of codes covering all aspects of fire hazards. Information on area classification is contained in several:
NFPA 70-The National Electrical Code(R)*..
NFPA 497A-Classification of Class I Hazardous Locations for Electrical Installation in Chemical Process Areas.
NFPA 497B-Classification...