OSHA 30 Hour Construction Program Practice Test

What type of fire does Class A refer to?

1. Electrical fires

2. Flammable liquids

3. Ordinary combustibles

4. Combustible metals

The correct answer is: Ordinary combustibles

Class A fires refer to fires that involve ordinary combustibles. This classification includes materials such as wood, paper, cloth, rubber, and certain plastics. The importance of understanding this classification lies in the types of extinguishing agents that are effective against these fires. For Class A fires, water is commonly used as it cools the material and helps to smother the flames. Recognizing the types of materials that fall under Class A is crucial for firefighters and safety personnel when developing strategies for fire prevention and response. The other classifications deal with different kinds of fires, which require specific extinguishing methods tailored to the nature of the materials involved. For example, electrical fires involve live electricity, flammable liquids can be ignited from sparks, and combustible metals require specialized agents to extinguish them effectively. Understanding Class A fires helps in addressing fire prevention and safety protocols effectively in environments where ordinary combustibles are present.