Fire Safety Officer Question:

Yes Fires are classified by the fuel they burn. There are four classes according to the OSHA:-

► Class A Fires:
☷ These are fires involving ordinary combustibles:
☷ Cloth, wood, paper, rubber, many plastics.
☷ The most effective extinguishing agent is WATER, and dry chemical rated for A, B, and C fires.

► Class B Fires:
☷ These are fires involving flammable and combustible liquids such as Motor Gasoline - Solvents (Acetone) - Alcohol.
☷ The extinguishing agents include Foams - Dry Chemicals - Carbon Dioxide - Halons.

► Class C Fires:
Fires that involve energized electrical equipment where the electrical non - conductivity of the extinguishing agent is of great importance.
The extinguishing agents are Dry Chemical - Carbon Dioxide - Halons.
Water or any fire extinguisher containing water or any agent mixed with water is not allowed to be used on fires involving live electrical equipment, since water is a good conductor of electricity.

► Class D Fires:
☷ These are fires involving metals such as Sodium - Potassium Magnesium.
☷ Special types of fire extinguishers are used to extinguish such fires