Which extinguisher is described as multipurpose and capable of extinguishing Class A, B, or C fires?

• A. ABC
• B. Type A
• C. Type B
• D. Type C

Answer: (A)

Fires are categorized by the kind of fuel and conditions involved, and some extinguishers are designed to handle multiple categories. An extinguisher labeled for A, B, and C fires is multipurpose and can tackle ordinary combustibles (like wood and paper), flammable liquids (like solvents and fuels), and energized electrical equipment.

The reason this is the best choice is that the ABC extinguisher uses a dry chemical powder that coats the fuel, cools the flames, and disrupts the chemical reactions occurring in the flame. Its powder is non-conductive, which helps when dealing with electrical fires, making it safe to use on energized equipment within its rating. This combination makes it effective across the three common fire types found in many facilities.

Fires involving only ordinary combustibles require a Type A extinguisher, which isn’t effective on liquids or electrical fires. Those involving only flammable liquids need a Type B extinguisher, which doesn’t address electrical or solid fuel fires. Those involving electrical equipment require a Type C extinguisher, which isn’t suitable for solid or liquid fuel fires.