What type of fire extinguisher is suitable for a de-energized electrical control panel?

The appropriate fire extinguisher for a de-energized electrical control panel is a Class C extinguisher. Class C extinguishers are specifically designed for fires involving electrical equipment, including wiring, circuit breakers, and control panels. Even though the panel is de-energized, Class C extinguishers use non-conductive agents, meaning they won't carry electricity, making them safe to use around electrical components.

Class A extinguishers are intended for ordinary combustibles such as wood, paper, and textiles, which makes them unsuitable for electrical fires. Class B extinguishers are meant for flammable liquids like gasoline and oil, while Class D extinguishers are specifically designed for combustible metals, such as magnesium and sodium. Therefore, using the appropriate Class C extinguisher ensures both safety and effective fire suppression for electrical control panels.