Which fire class can be extinguished using CO2?

The reason CO2 is effective for extinguishing fires in Class C is due to the nature of these fires, which involve flammable gases or energized electrical equipment. CO2 extinguishers work by displacing oxygen in the environment, which is vital for combustion. They do not leave a residue, making them ideal for use on live electrical fires, as they minimize the risk of damage to sensitive equipment.

Class C fires specifically include those that involve energized electrical equipment, and CO2 does not conduct electricity, allowing it to be safely used in such situations. Therefore, the correct choice is based on the specific chemical properties of CO2 and its ability to safely extinguish fires involving electrical components without causing further hazards.