What materials are classified as common combustibles in a Class Alpha fire?

In the context of fire classifications, common combustibles that fall under Class Alpha fires include materials such as wood, cloth, paper, rubber, and certain plastics. Class Alpha fires are typically fueled by ordinary combustible materials and are characterized by their tendency to burn easily and produce flames.

These materials ignite readily and sustain combustion, making them a primary focus for firefighting efforts involving Class Alpha fires. When addressing such fires, water is commonly used to extinguish the flames effectively, as it cools the burning materials and reduces the temperature below their ignition point.

In contrast, the other options do not fall into the category of Class Alpha combustibles. For example, pipes and metals do not catch fire and are not combustible, organic fuels like gasoline are classified as flammable liquids rather than common combustibles, and electrical components require different extinguishing methods due to the potential for electrical hazards. Thus, recognizing wood, cloth, paper, rubber, and certain plastics as Class Alpha combustibles is essential for understanding fire safety and effective firefighting techniques.