Which extinguishing agents are recommended for electrical fires and why?

• A. Water is safest as it cools the equipment.
• B. CO2 or dry chemical ABC extinguishers; water can conduct electricity and endanger responders.
• C. Foams are best because they create a barrier.
• D. Wetting agents are preferred because they coat surfaces.

Answer: (B)

For an electrical fire, the goal is to suppress the flame without creating a path for electricity to flow to you or through the extinguisher. The best choices are carbon dioxide and dry chemical ABC extinguishers. Carbon dioxide is non-conductive and blankets the fire, displacing oxygen without leaving a conductive residue, which helps protect energized equipment and responders. Dry chemical ABC powder is also non-conductive and interrupts the flame chemically, making it effective on electrical fires where the power can’t be shut off right away.

Water-based agents, including many foams and wetting agents, pose a shock risk because water conducts electricity and can create a conductive path that endangers you and can energize equipment or cause short circuits. That’s why they’re not preferred for live electrical fires. If you can safely cut the power first, that’s ideal, but when you must fight an energized electrical fire, non-conductive extinguishing media like CO2 or dry chemical is the safer choice.