Which option correctly indicates the fire type for which CO2 extinguishers are suitable?

• A. Class A
• B. Electrical equipment fires
• C. Class B
• D. Class D

Answer: (B)

CO2 extinguishers are used primarily for electrical equipment fires because they displace the surrounding air without leaving residue and without conducting electricity. This means you can extinguish a fire in energized electrical gear without risking short circuits or damage to sensitive electronics, and you don’t introduce water or other liquids that could create additional hazards in electrical systems. That's why a fire involving electrical equipment is the scenario where CO2 extinguishers are most suitable. They’re not ideal for solid fuels (Class A) or metal fires (Class D), which require different extinguishing methods, and they’re less suitable for large liquid fires (Class B) due to limited cooling and potential re-ignition.