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

Classification Basics

What Is A Classified Area?

What Classified Areas Are Not

According to the definition of a Class I location Class I location

From NEC 500.5(B)(2) (selected language):
       (2) Class I, Division 2. A Class I, Division 2 location is a location
(1) In which volatile flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors 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 ...
(FPN No. 2): Piping without valves, checks, meters, and similar devices would not ordinarily introduce a hazardous condition even though used for flammable liquids or gases.... , a gas furnace used in a dwelling could be considered to create a Class I area because a leak could develop or a component such as a gas valve could fail. However, when such leaks do happen, the gas is usually ignited by some non-electrical source such as a pilot light on the same or a nearby gas appliance. Even if the area were classified and special electrical equipment installed, the appliance itself provides an ignition source, so little would be accomplished. Therefore, the areas around most gas-fired appliances in dwellings and elsewhere are unclassified areas.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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