G2 Gas Fitter Practice Exam 2025 - Free Gas Fitter Practice Questions and Study Guide

There are four main types or classes of fires, and understanding these classes is crucial for selecting the appropriate type of fire extinguisher. Fires are categorized based on the materials that are burning, which influence the combustion characteristics and the proper extinguishing methods.

Class A fires involve ordinary combustible materials such as wood, paper, and textiles. Class B fires are fueled by flammable liquids and gases, like gasoline and oil. Class C fires involve energized electrical equipment, making it essential to use extinguishers that do not conduct electricity. Lastly, Class D fires consist of combustible metals, such as magnesium or sodium, which require specific extinguishing agents due to their unique burning properties.

Selecting the correct fire extinguisher that corresponds to these classes ensures effective fire suppression while also ensuring the safety of the user and bystanders. Understanding these classifications allows individuals to recognize the fire risks prevalent in their environment and choose the right safety equipment accordingly.