Which class of fire extinguisher is appropriate to use for an electrical equipment fire?

The correct choice for a fire involving electrical equipment is Class C. This class of fire extinguishers is specifically designed for combating fires that involve energized electrical equipment such as wiring, circuit breakers, and appliances. Using a Class C fire extinguisher is essential because it contains non-conductive agents that effectively extinguish electrical fires without posing a risk of electric shock to the user.

Class C extinguishers usually employ dry chemical agents, such as bicarbonate or ammonium phosphate, which smother the fire and interrupt the chemical reaction necessary for combustion. It is important to ensure that any extinguisher used on an electrical fire is rated for Class C, as other types may result in hazards, such as shorts or re-ignition of the fire.

Class A extinguishers are intended for ordinary combustibles like wood and paper, whereas Class B extinguishers are meant for flammable liquids such as oils and solvents. Class D is reserved for combustible metals. Hence, utilizing a Class C extinguisher is the safest and most effective option for fighting electrical fires.