What class of fire includes ordinary combustibles?

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

Answer: (A)

Fires are grouped by the fuel that feeds them. Ordinary combustibles such as wood, paper, and cloth burn and leave ash, so they belong to Class A. Knowing this helps choose the right extinguishing approach—cooling with water-based agents or covering the fuel to cool and suppress the flame works well for Class A fires. In contrast, Class B covers flammable liquids, Class C covers energized electrical equipment, and Class D covers certain combustible metals. So, for ordinary combustibles, the appropriate class is Class A.