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NFPA 497: Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas.

Hazardous area classification is: a method of analysing and classifying an area to facilitate appropriate equipment selection. key to reducing the risk of fires or explosions and keeping dangerous work environments safe. critical in protecting people, plant and equipment.

Some locations include: Petroleum refineries. Gasoline storage and dispensing areas. Rooms with propane gas installation. Dry cleaning plants (where vapors from fluids may be present) Spray paint booths and finishing areas. Paint shops and facilities. Aircraft hangers with fuel servicing areas. Utility gas plants.

API RP 505. Recommended Practice for Classification of Locations for. Electrical Installations at Petroleum Facilities Classified as. Class I, Zone 0, Zone 1, and Zone 2. 2.

Class I locations are those in which flammable vapors and gases may be present. Class II locations are those in which combustible dust may be found. Class III locations are those which are hazardous because of the presence of easily ignitable fibers or flyings.

The API Recommended Practice 500 (RP 500) is Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities. they are classified as Class 1, Divison 1, and Division 2. RP 500 is referred to as the division system.

The HCS defines hazard class as the nature of a physical or health hazard, e.g., flammable solid, carcinogen, and acute toxicity. Hazard category means the division of criteria within each. hazard class, e.g., acute toxicity and flammable liquids each include four hazard categories.