Which extinguishing agents are considered appropriate for electrical fires?

• A. Water only
• B. Wet chemical only
• C. CO2 and dry chemical ABC/BC extinguishers
• D. Foam only

Answer: (C)

Electrical fires require extinguishing agents that won’t conduct electricity or leave a conductive residue. Water-based methods pose a shock risk because water conducts electricity and can create short circuits or spread the current to other components. Foam shares that water content issue, so it’s not suitable for energized equipment. Wet chemical extinguishers are designed for cooking fires and introduce moisture that can damage electrical gear, so they’re not appropriate here. Non-conductive dry chemical powders used in ABC/BC extinguishers are effective because they blanket and insulate the flame, interrupt the chemical reactions, and don’t create a conductive path. Carbon dioxide extinguishers also work well on electrical fires because they displace oxygen and leave no residue that could conduct electricity, though they should be used with caution in occupied spaces. Therefore, the appropriate agents are CO2 and dry chemical ABC/BC extinguishers.