Which extinguisher class is for energized electrical equipment?

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

Answer: (C)

Fires in energized electrical equipment require an extinguishing agent that won’t conduct electricity. The extinguisher designed for energized electrical fires uses non-conductive media (such as certain dry chemical powders or CO2), allowing you to suppress the flame without creating a shock risk to the operator. Using water-based or other conductive agents on live electrical equipment can cause electrocution or spread the fire. Other extinguisher classes target different fuels—ordinary combustibles, metals, or cooking fats—and aren’t suitable for live electrical fires. If power can be safely shut off, you would reassess the situation, but for a live electrical fire the non-conductive, electrically safe option is the best choice.