What rating must a fire extinguisher have to be used for a fire involving live electrical equipment?

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

Answer: (C)

When a fire involves equipment that is still energized, the priority is to avoid conducting electricity while you suppress the flames. An extinguisher rated for electrical fires is required—Class C. This designation means the agent is non-conductive and safe to use on live electrical equipment, reducing the risk of electric shock to the person fighting the fire. If possible, disconnect power first; if not, rely on a Class C extinguisher to suppress the fire. Other ratings apply to different fire types (ordinary combustibles, flammable liquids, metals) and are not appropriate for fires involving live electrical equipment.