Class A fires involve which materials?

Class A fires involve which materials?

• A. Electrical outlets
• B. Bedding, books, wood, and paper
• C. Gasoline and oil
• D. Magnesium and sodium

Answer: (B)

Fires involving ordinary combustibles burn in a way that the fuel leaves behind ash, and they are best suppressed by cooling the fuel with water. Bedding, books, wood, and paper are classic examples of these fuels, so they fit squarely into Class A. The reason this is the right choice is that these materials share a common burning behavior: they ignite from heat sources and burn until the material is exhausted, and water-based extinguishing agents work well because they absorb heat and lower the fuel temperature below its ignition point. In contrast, an electrical outlet points to an electrical fire, which is treated as an electrical hazard (often Class C). Gasoline and oil are flammable liquids, which belong to the flammable liquids class (Class B) because they vaporize and ignite, needing different extinguishing approaches. Magnesium and sodium are metals that burn vigorously in metal fires (Class D) and require special dry powder agents.

Fires involving ordinary combustibles burn in a way that the fuel leaves behind ash, and they are best suppressed by cooling the fuel with water. Bedding, books, wood, and paper are classic examples of these fuels, so they fit squarely into Class A. The reason this is the right choice is that these materials share a common burning behavior: they ignite from heat sources and burn until the material is exhausted, and water-based extinguishing agents work well because they absorb heat and lower the fuel temperature below its ignition point.

In contrast, an electrical outlet points to an electrical fire, which is treated as an electrical hazard (often Class C). Gasoline and oil are flammable liquids, which belong to the flammable liquids class (Class B) because they vaporize and ignite, needing different extinguishing approaches. Magnesium and sodium are metals that burn vigorously in metal fires (Class D) and require special dry powder agents.