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Classification Basics

Classification Terminology

Class I Areas

Class I areas are classified due to the presence of gases or vapors or liquids that will form vapors. The gases or vapors can mix with air to form an ignitable mixture. Areas are not classified due to nonflammable nonflammable
Some nonflammable gases such as nitrous oxide may increase the hazard of some flammable gases when the gases are mixed, but the presence of nitrous oxide alone does not justify the classification of an area. or inert gases or oxygen oxygen
The NEC and most other classification documents do not cover oxygen-enriched areas because the special equipment intended for use in classified areas is tested only for mixtures in ordinary air. Many products that are not particularly hazardous in ordinary atmosphere are highly ignitable in oxygen-enriched atmospheres..
NOTE: This is an unformatted excerpt from our online fire protection training library.

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