Which type of fire extinguisher should be used on electrical fires?

Using a Type C extinguisher for electrical fires is the correct choice because these extinguishers are specifically designed to combat fires involving energized electrical equipment. Type C extinguishers typically use non-conductive agents such as carbon dioxide (CO2) or dry chemical agents that can safely extinguish the flames without conducting electricity, thereby minimizing the risk of electrical shock to the person using the extinguisher.

In contrast, Type A extinguishers are meant for ordinary combustible materials like wood and paper, and Type B extinguishers are aimed at flammable liquids such as oils and greases. Type D extinguishers are used for combustible metals, which are entirely different from the electrical hazards that Type C extinguishers are rated for. Thus, for any fire involving live electrical equipment, a Type C extinguisher is both safe and effective.