What class of fire includes flammable and combustible liquids?

• A. Class A
• B. Class D
• C. Class B
• D. Class C

Answer: (C)

Fires caused by flammable and combustible liquids are classified as Class B. This category covers liquids like gasoline, oil, paints, solvents, and other fuels that can flow and vapors that sustain burning. Because the fuel is a liquid, the goal is to separate the fuel from the heat and prevent the liquid from spreading; water is often inappropriate since it can spread the liquid and make the fire worse. Suitable extinguishing methods for these fires include foam, dry chemical powders, and CO2, which help blanket the fuel or interrupt the chemical reaction without dispersing the liquid.

In contrast, Class A fires involve ordinary combustibles such as wood and paper; Class C fires involve energized electrical equipment where nonconductive agents are required and the power should be de-energized; Class D fires involve combustible metals that need specialized dry powders.