Fire classifications categorize fires based on the type of fuel involved, which helps determine the correct extinguishing method.
– Class A fires involve ordinary combustible materials such as wood, paper, cloth, rubber, and many plastics. These fires are best extinguished by cooling, typically with water.
– Class B fires involve flammable or combustible liquids and gases, such as gasoline, oil, solvents, and propane. Extinguishment focuses on smothering or interrupting the chemical reaction.
– Class C fires involve energized electrical equipment, including wiring, appliances, and motors. Nonconductive extinguishing agents are required until power is removed.
– Class D fires involve combustible metals such as magnesium, titanium, sodium, and lithium. Specialized dry powder agents are required.
– Class K fires involve cooking oils and fats, commonly found in commercial kitchens, and require wet chemical extinguishing agents to cool and prevent re-ignition.