Which materials fall under Class A (ordinary combustibles)?

Which materials fall under Class A (ordinary combustibles)?

• A. wood, paper, cloth
• B. gasoline, paints, oils
• C. electrical wiring, fuse box
• D. lithium batteries

Answer: (A)

Fires with ordinary combustibles burn as solids and leave ash, so they respond best to cooling and smothering approaches. Wood, paper, and cloth are quintessential examples of these materials, making them the correct match for Class A. Flammable liquids like gasoline, paints, and oils fuel fires differently and fall under a different class that relies on blocking the liquid’s vapors or chemical reactions rather than simply cooling the fuel. Electrical wiring and fuse boxes involve energized electrical equipment, which requires methods suitable for electrical fires. Lithium batteries don’t fit the ordinary solid-fuel category and require specialized handling and extinguishing approaches.

Fires with ordinary combustibles burn as solids and leave ash, so they respond best to cooling and smothering approaches. Wood, paper, and cloth are quintessential examples of these materials, making them the correct match for Class A.

Flammable liquids like gasoline, paints, and oils fuel fires differently and fall under a different class that relies on blocking the liquid’s vapors or chemical reactions rather than simply cooling the fuel. Electrical wiring and fuse boxes involve energized electrical equipment, which requires methods suitable for electrical fires. Lithium batteries don’t fit the ordinary solid-fuel category and require specialized handling and extinguishing approaches.