Local application systems shall be used for extinguishment of which fires?

• A. Fires in electrical equipment only
• B. Surface fires in flammable liquids, gases, and shallow solids where the hazard is not enclosed or where the enclosure does not conform to total flooding
• C. Deep-seated fires in fully enclosed compartments
• D. Fires in large warehouse spaces with enclosed compartments

Answer: (B)

Local application systems are designed to deliver extinguishing agent directly to the fire on exposed surfaces rather than filling an entire space. They’re best suited for surface fires in hazards like flammable liquids, gases, and shallow solids when the fire is not inside an enclosure, or when the enclosure cannot be flooded to achieve the required agent concentration. This approach provides rapid cooling and knockdown at the surface without needing to flood a whole room. Fires that are deep-seated in fully enclosed compartments or in large spaces with enclosed compartments typically require total flooding, not a local application, because the agent must reach concealed burning material.