Which statement best describes Class A fires?

Which statement best describes Class A fires?

• A. Fires involving energized electrical equipment.
• B. Fires involving flammable liquids.
• C. Fires involving ordinary combustibles.
• D. Fires involving metals.

Answer: (C)

Class A fires involve ordinary combustibles—materials such as wood, paper, cloth, and rubber. These fuels burn in their solid form and typically leave ash. Because the key issue is cooling the fuel to below its ignition temperature, water or water-based extinguishing agents are effective for Class A fires. The goal is to remove the heat and prevent re-ignition by keeping the solid fuels cool. The other described fire scenarios represent different classes: a fire from energized electrical equipment, a fire from flammable liquids, or a fire from metals. Those require different suppression approaches—de-energizing the electrical source and using non-conductive agents for electrical fires, using foam or dry chemical for liquid fuels, and using specialized dry powders for metal fires. Because the statement focusing on ordinary combustibles directly matches the typical fuel source and suppression method for Class A, it is the best description.

Class A fires involve ordinary combustibles—materials such as wood, paper, cloth, and rubber. These fuels burn in their solid form and typically leave ash. Because the key issue is cooling the fuel to below its ignition temperature, water or water-based extinguishing agents are effective for Class A fires. The goal is to remove the heat and prevent re-ignition by keeping the solid fuels cool.

The other described fire scenarios represent different classes: a fire from energized electrical equipment, a fire from flammable liquids, or a fire from metals. Those require different suppression approaches—de-energizing the electrical source and using non-conductive agents for electrical fires, using foam or dry chemical for liquid fuels, and using specialized dry powders for metal fires. Because the statement focusing on ordinary combustibles directly matches the typical fuel source and suppression method for Class A, it is the best description.