How many main fire classes are there?

How many main fire classes are there?

• A. 3
• B. 5
• C. 6
• D. 4

Answer: (D)

Four main fire classes are taught here. They cover fires from ordinary combustibles, flammable liquids, electrical equipment, and certain metals. Ordinary combustibles include wood, paper, and cloth; flammable liquids cover fuels like gasoline and solvents; electrical fires involve energized electrical equipment; metal fires involve combustible metals such as magnesium or titanium. Some references add a Class K for cooking oils, but in this context those aren’t counted among the main four.

Four main fire classes are taught here. They cover fires from ordinary combustibles, flammable liquids, electrical equipment, and certain metals. Ordinary combustibles include wood, paper, and cloth; flammable liquids cover fuels like gasoline and solvents; electrical fires involve energized electrical equipment; metal fires involve combustible metals such as magnesium or titanium. Some references add a Class K for cooking oils, but in this context those aren’t counted among the main four.