What is the classification system used for fires primarily based on?

The classification system for fires is primarily based on the source of fuel because it helps in categorizing fires into distinct classes, each requiring different methods for control and extinguishment. Fires are classified into categories such as Class A, B, C, D, and K, depending on the material that is burning. For example, Class A fires involve ordinary combustibles such as wood and paper, Class B fires involve flammable liquids, Class C involves electrical fires, Class D involves combustible metals, and Class K involves cooking oils and fats.

Understanding the source of fuel is critical for responders, as it dictates the appropriate extinguishing agents and techniques to use for effective fire suppression. By knowing the fuel type, responders can quickly assess hazards and engage with the correct firefighting approach, thus enhancing safety and effectiveness in fire response situations. While intensity, size, and extinguishing agents are important factors in managing a fire, they are secondary considerations once the fuel classification is established.