What is a class A fire?

What is a class A fire?

• A. This is a fire involving ordinary combustibles. E.g. Wood, Paper, cloth etc...
• B. This is a fire involving live electrical equipment.
• C. This is a fire involving flammable liquids like oil and grease!
• D. This is a fire involving burning metals.

Answer: (A)

A fire involving ordinary combustibles means materials that burn and leave ash, such as wood, paper, cloth, and cardboard. These fuels are effectively cooled by water, which absorbs heat and drops the temperature of the fuel below its ignition point, stopping the combustion process. That’s why water-based extinguishing methods are commonly used for these fires. The other described fire types involve different fuels: live electrical equipment fires require power to be cut and non-conductive extinguishing media; flammable liquids like oil and grease create Class B fires and spread with vapors; burning metals form Class D fires and need specialized agents. So the description of ordinary combustibles clearly matches the correct concept.

A fire involving ordinary combustibles means materials that burn and leave ash, such as wood, paper, cloth, and cardboard. These fuels are effectively cooled by water, which absorbs heat and drops the temperature of the fuel below its ignition point, stopping the combustion process. That’s why water-based extinguishing methods are commonly used for these fires. The other described fire types involve different fuels: live electrical equipment fires require power to be cut and non-conductive extinguishing media; flammable liquids like oil and grease create Class B fires and spread with vapors; burning metals form Class D fires and need specialized agents. So the description of ordinary combustibles clearly matches the correct concept.