Associate Safety Professional Practice Exam

Which class of fire involves combustible metals?

1. Class B

2. Class C

3. Class D

4. Class K

The correct answer is: Class D

Combustible metals, such as magnesium, sodium, and potassium, are classified under Class D fires. This classification is specific because these metals react differently when ignited compared to organic materials or flammable liquids. Class D fires require special extinguishing agents that are designed specifically for metal fires, as conventional methods like water can actually exacerbate the situation. Class B fires involve flammable liquids, such as gasoline or oils, and Class C fires pertain to electrical fires involving energized equipment. Class K fires are related to cooking oils and fats, common in commercial kitchen settings, and have different fire suppression needs. Understanding these classifications is critical for effective fire safety and response planning, especially in environments where combustible metals are present.