Which class of fire extinguishers use electrically nonconductive extinguishing agents?

Class C fire extinguishers are specifically designed for fires involving electrical equipment. The extinguishing agents used in Class C extinguishers are electrically nonconductive, which is crucial for safety when dealing with electrical fires. If a fire occurs in an area where there are live electrical wires or equipment, using a conductive extinguishing agent, such as water, could create a serious hazard, potentially resulting in electrocution.

In contrast, other classes of fire extinguishers are aimed at different types of combustible materials. For instance, Class A extinguishers are intended for ordinary combustibles like wood and paper, Class B extinguishers target flammable liquids, and Class D extinguishers are for combustible metals. While these extinguishers may be effective for their specific fire types, they do not utilize extinguishing agents that ensure electrical safety when dealing with electrical fires, making Class C the suitable choice for that specific scenario.