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

Identifying Materials & Equipment

Liquids, Vapors & Gases

Group C

Definition: Flammable gas, flammable liquid produced vapor, or combustible liquid produced vapor mixed with air that may burn or explode, having either a maximum experimental safe gap (MESG) value greater than 0.45 mm and less than or equal to 0.75 mm, or a minimum igniting current ratio (MIC ratio) greater than 0.40 and less than or equal to 0.80. [NFPA 497, 1-3]

Ethylene is a typical Group C material. The original basis for Group C was ethyl ether which was used as an anesthetic.

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

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