The appropriate portable extinguisher for extinguishing a fire in a computer is which class?

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

Answer: (C)

Fires involving electrical equipment require extinguishing methods that won’t conduct electricity. A computer is energized electrical equipment, so the extinguisher chosen must be rated for electrical fires. Water-based extinguishers would pose a shock hazard and can spread current through you and the equipment. A Class C extinguisher is designed for energized electrical fires and uses agents that minimize conductivity, making it safer to apply to a live computer fire. If possible, shut off power to the equipment before bringing the extinguisher into use, and aim at the base of the flames with a sweeping motion. Other extinguisher types address different fuel sources (ordinary combustibles, flammable liquids, or metals) and aren’t appropriate for an electrical fire in a computer.