Classification of Fires and Selection of Extinguishers
Fires are classified into four general categories depending on the type of
material or fuel involved. The type of fire determines the type of
extinguisher that should be used to extinguish it.
- Class A fires involve materials such as wood, paper, and cloth which
produce glowing embers or char.
- Class B fires involve flammable gases, liquids, and greases, including
gasoline and most hydrocarbon liquids which must be vaporized for combustion
- Class C fires involve fires in live electrical equipment or in materials
near electrically powered equipment.
- Class D fires involve combustible metals, such as magnesium, zirconium,
potassium, and sodium.
Extinguishers will be selected according to the potential fire hazard, the
construction and occupancy of facilities, hazard to be protected, and other
factors pertinent to the situation.