What general type of materials does Class A fire pertain to?

Class A fires involve ordinary combustible materials. This includes solid substances like wood, cloth, paper, rubber, and many plastics. These materials can ignite and sustain a fire because they are typically organic in nature and readily available in many environments, such as homes, offices, and forests. The key characteristic of Class A materials is that they burn and can be extinguished effectively with water or other types of fire suppressants designed for such fires.

The other options refer to different classes of fire. Flammable liquids fall under Class B fires, which specifically deal with materials that are in liquid form and can easily ignite. Electrical equipment is classified as Class C fires due to the risk of shock and other hazards related to the presence of electricity. Lastly, combustible metals are characterized as Class D fires, as they require special extinguishing agents to safely combat them, given their unique burning properties and higher ignition temperatures. Understanding these distinctions is crucial for effective fire prevention and safety measures.