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

Identifying Materials & Equipment

Liquids, Vapors & Gases

Autoignition Temperature

The Autoignition Temperature (AIT AIT is sometimes called Apparent Ignition Temperature, or just (less accurately) Ignition Temperature. The AIT determined for a material may depend on the test method, so these values are approximations. Therefore the temperature limits placed on electrical equipment are often somewhat less than the AIT of the atmospheres for which they are intended.) is the minimum temperature required to initiate or cause self-sustained combustion of a solid, liquid, or gas independently of the heating or heated element. Surface temperatures of enclosures are critical for heat-producing equipment such as motors, luminaires, and transformers.


Disassembled motor for certain classified areas. Note the fins that increase surface area.
(Courtesy of General Electric Company)
NOTE: This is an unformatted excerpt from our online fire protection training library.

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