Which of the following options best describes why CO2 or dry chemical extinguishers are used on electrical fires instead of water-based extinguishers?

• A. It is cheaper
• B. It avoids water damage to electrical equipment
• C. It requires less training to use
• D. It discharges more quickly

Answer: (B)

Water can conduct electricity and cause short circuits or additional damage if used on electrical fires. Using a water-based extinguisher introduces a conductive liquid to energized parts, which is dangerous for both the equipment and the person fighting the fire. CO2 and dry chemical extinguishers avoid this problem. CO2 provides a non-conductive gas that blankets the fire without leaving a liquid path for current, while dry chemical powders sit on the fire and do not conduct electricity, helping to suppress the flame without wetting the equipment. That non-water, non-conductive approach is why these extinguishers are preferred for electrical fires, even though there are other considerations like space safety (for CO2) and cleanup (for dry chemical).