What defines a Class A fire?

A Class A fire is defined as one that involves ordinary combustibles, which typically include materials such as wood, paper, textiles, and some plastics. These materials are common in many environments and can ignite easily, presenting a significant fire hazard. Class A fires are generally extinguished using water or foam, as these methods effectively cool the flames and remove heat from the combustion process.

In contrast, the other options identify different classes of fires. Fires fueled by liquids typically refer to Class B fires, which involve flammable liquids like gasoline or oil. Fires involving electrical equipment are classified as Class C fires, which may require special extinguishing agents that do not conduct electricity. Finally, fires fueled by metals, often seen with substances such as magnesium or titanium, would fall under Class D. Understanding these classifications is crucial for selecting the appropriate fire suppression method and ensuring safety protocols are followed effectively.