Electrically energized equipment is the cause of Class C fires. The purpose of extinguishers with a rating of C is to put out fires that involve energized electrical equipment.
Each of the four classes of fire extinguishers—A, B, C, and D—is capable of putting out a distinct kind of fire.
Water extinguishers with air pressure put out fires by cooling the fuel's surface to get rid of the "heat" in the fire triangle. Never use water to put out electrical or flammable liquid fires.
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