Which class of fires involves ordinary combustibles such as wood and paper?

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

Answer: (A)

Fires that involve ordinary combustibles such as wood and paper are Class A. These fuels are solid, everyday materials that burn to form ash, and the most effective extinguishing approach is to cool the fuel below its ignition temperature, often with water, which also helps prevent re-ignition. The other classes cover different hazards: liquids like gasoline fall under Class B, energized electrical equipment under Class C, and reactive metals under Class D. So describing ordinary combustibles clearly points to the correct class.