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Electrical Area Classifications
Facilities, or portions of facilities are classified electrically according to the type of material present and its flammability and/or explosive potential. Each area classification carries with it specific requirements for the construction requirements found within that space to guard against sparking. The Class of an area refers to the type of material; the Division of the area refers to whether that material is normally found in that area or not. Electrical classifications are covered by the National Electrical Code (NEC) adopted by the National Fire Protection Association (NFPA) as Volume 6 of the National Fire Codes.

They are:

1. Class I, Division 1: A Class I, Division 1 location (1) is that in which ignitable concentrations of flammable gases/vapors can exist under normal operating conditions; or (2) in which ignitable concentrations of such gases/vapors may exist frequently because of repair, maintenance operations or because of leakage; or (3) in which breakdown or faulty operation of equipment or process may release ignitable concentrations of flammable gases/vapors, and might also cause simultaneous failure of electric equipment

2. Class I, Division 2: A Class I, Division 2 location (1) is that in which volatile flammable liquids or flammable gases are handled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containers or closed systems from which they can escape only in case of accidental rupture or breakdown of such containers or systems, or in case of abnormal operation of equipment; or (2) in which ignitable concentrations of gases or vapors are normally prevented by positive mechanical ventilation, and which might become hazardous through failure or abnormal operation of the ventilating equipment; or (3) that is adjacent to a class I, Division 1 location, and to which ignitable concentrations of gases or vapors might occasionally be communicated unless such communication is prevented by adequate positive-pressure ventilation from a source of clean air, and effective safeguards against ventilation failure are provided

3. Class II, Division 1: A Class II, Division 1 location (1) is that in which combustible dust is in the air under normal operating conditions in quantities sufficient to produce explosive or ignitable mixtures; or (2) where mechanical failure or abnormal operation of machinery or equipment might cause such explosive or ignitable mixtures to be produced, and might also provide a source of ignition through simultaneous failure of electric equipment, operation of protection device, or from other causes; or (3) in which combustible dusts of an electrically conductive nature may be present in hazardous quantities

4. Class II, Division 2: A Class II, Division 2 location (1) is that in which combustible dust is not normally in the air in quantities sufficient to produce explosive or ignitable mixtures, and dust accumulations are normally insufficient to interfere with the normal operation of electrical equipment or other apparatus but combustible dust may be in suspension in the air as a result of infrequent malfunctioning of handling or processing equipment and where combustible dust accumulations on, in, or in the vicinity of the electrical equipment may be sufficient to interfere with the safe dissipation of heat from electrical equipment or may be ignitable by abnormal operation or failure of electrical equipment

5. Class III, Division 1: A Class III, Division 1 location is that in which easily ignitable fibers or materials producing combustible filings are handled, manufactured, or used.

6. Class III, Division 2: Class III, Division 2 location is that in which easily ignitable fibers are stored or handled