To avoid electrical shock, what class fire extinguisher should be used on electrical equipment?

The correct choice is the Class C fire extinguisher because it is specifically designed for fires involving electrical equipment. This type of extinguisher uses non-conductive agents to extinguish flames effectively while minimizing the risk of electrical shock. When dealing with electrical fires, it's crucial to avoid using water or extinguishers meant for other classes of fires, as they can conduct electricity and pose a serious hazard to individuals trying to combat the fire.

Class A extinguishers are intended for ordinary combustibles like wood, paper, and textiles; they are not suitable for electrical fires. Class B extinguishers are meant for flammable liquids such as gasoline and oil, which do not pertain to electrical equipment. Class D extinguishers are used for combustible metals, commonly found in specific industrial environments, and therefore are not applicable to electrical fires. This differentiation is essential for ensuring safety and effectiveness when addressing various types of fire emergencies.