Class A fires involve which type of materials?

Class A fires involve which type of materials?

• A. Ordinary combustibles
• B. Flammable liquids
• C. Electrical equipment
• D. Reactive metals

Answer: (A)

Fires are classified by the type of fuel they involve. Class A fires involve ordinary combustibles—materials that burn to ash such as wood, paper, cloth, rubber, and many plastics. Water is effective here because it cools the fuel below its ignition temperature and stops the flame. This fits best because the other options describe different fuel types: flammable liquids feed fires that burn liquids and vapors (Class B), electrical equipment fires (Class C), and reactive metals (Class D).

Fires are classified by the type of fuel they involve. Class A fires involve ordinary combustibles—materials that burn to ash such as wood, paper, cloth, rubber, and many plastics. Water is effective here because it cools the fuel below its ignition temperature and stops the flame.

This fits best because the other options describe different fuel types: flammable liquids feed fires that burn liquids and vapors (Class B), electrical equipment fires (Class C), and reactive metals (Class D).