Which extinguisher class is used for electrical equipment fires?

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

Answer: (C)

Fires involving electrical equipment require an extinguishing agent that won’t conduct electricity because the equipment may still be energized. Class C extinguishers are designed for energized electrical fires, using non-conductive agents that suppress the fire without creating a path for electric shock. If you can safely disconnect power, do so, then proceed with extinguishing as needed. Other extinguisher classes target different hazards—ordinary combustibles, flammable liquids, or combustible metals—and aren’t appropriate for live electrical fires because they don’t address the electrical shock risk.