How is the classification of fires (A, B, C, D, and K) determined?

The classification of fires into categories A, B, C, D, and K is determined primarily by the materials involved and specific characteristics of the fire. Each classification is designed to help firefighters understand the nature of the fire, the potential hazards, and the appropriate methods and agents for suppression.

For instance, Class A fires involve ordinary combustible materials such as wood, paper, and cloth. Class B fires are fueled by flammable liquids and gases, making them distinct from the solid materials of Class A. Class C fires involve energized electrical equipment, which requires careful consideration to avoid electrocution. Class D fires are associated with combustible metals and require specialized extinguishing agents, while Class K fires pertain to cooking oils and fats, necessitating unique extinguishing methods.

Recognizing these classifications helps responders prepare effectively, ensures safety during firefighting operations, and dictates the necessary equipment and techniques to control and extinguish the fire efficiently.