The classification “Class C” refers to fires that involve energized electrical equipment such as appliances, tools, and wiring. These types of fires are often caused by short circuits or faulty electrical components. It is important to note that Class C fires should not be fought with an extinguisher that sprays water or any other conductor of electricity as it can cause electrocution.
Instead, Class C fire extinguishers use a non-conductive extinguishing agent, such as carbon dioxide (CO2) or a clean fire extinguishing agent such as a clean agent extinguisher. These agents work by suffocating the fire by removing the oxygen or by interrupting the chemical reactions that are taking place in the fire. These types of extinguishers are labeled with a “C” on them, to indicate that they are safe to use on electrical fires.