Which fire extinguisher is appropriate for energized electrical equipment fires?

• A. Class A
• B. Class B
• C. Class D
• D. Class C

Answer: (D)

Fires involving energized electrical equipment require an extinguisher that is non-conductive and safe to apply to live circuits. That type is the one designed for electrical fires, commonly called Class C. It uses non-conductive extinguishing agents, minimizing the risk of electric shock while you suppress the fire. In a cabinetmaking shop, where power tools and electrical panels are present, this safety distinction is crucial so you can address the fire without turning a live circuit into a shock hazard. If it’s safe to do so, shut off the power before using the extinguisher. The other extinguishers are intended for different fuels—ordinary combustibles, flammable liquids, or metal fires—and are not suitable for energized electrical fires, as they can conduct electricity or be ineffective on electrical equipment.