This classification of fire involves ordinary combustible material.

This classification of fire involves ordinary combustible material.

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

Answer: (A)

Fires are categorized by the type of fuel involved, which guides the extinguishing approach. Ordinary combustibles such as wood, paper, cloth, and many textiles are grouped as Class A. These fuels burn cleanly enough to leave ash, and the most effective way to extinguish them is cooling with water, which lowers the temperature and stops the flame. The other classes cover different fuels: Class B involves flammable liquids like gasoline and solvents, where water is typically not effective and smothering or using agents like foam or dry chemical is preferred; Class C involves energized electrical equipment, where de-energizing the circuit and using nonconductive extinguishing agents is the priority; Class D covers combustible metals such as magnesium or titanium, which require specialized dry powders to avoid a violent reaction. So, for ordinary combustibles, the correct classification is Class A.

Fires are categorized by the type of fuel involved, which guides the extinguishing approach. Ordinary combustibles such as wood, paper, cloth, and many textiles are grouped as Class A. These fuels burn cleanly enough to leave ash, and the most effective way to extinguish them is cooling with water, which lowers the temperature and stops the flame. The other classes cover different fuels: Class B involves flammable liquids like gasoline and solvents, where water is typically not effective and smothering or using agents like foam or dry chemical is preferred; Class C involves energized electrical equipment, where de-energizing the circuit and using nonconductive extinguishing agents is the priority; Class D covers combustible metals such as magnesium or titanium, which require specialized dry powders to avoid a violent reaction. So, for ordinary combustibles, the correct classification is Class A.