Which fire extinguisher is most effective for class B and C fires?

The most effective fire extinguisher for Class B and C fires is the CO2 extinguisher. Class B fires involve flammable liquids such as gasoline, oil, and grease, while Class C fires pertain to electrical equipment. The CO2 extinguisher works by displacing oxygen and creating an inert atmosphere that suffocates the flames. This is particularly important for Class C fires, where using water or other agents could pose the risk of electric shock or further complications, such as equipment damage.

CO2 is non-conductive, making it safe for use on electrical fires, and its ability to cool the surroundings while not leaving residue makes it suitable for areas with delicate equipment. While dry chemical extinguishers can also be effective for Class B and C fires, CO2 extinguishers are preferred in many scenarios due to their clean application and safety in electrical contexts.