A Class C extinguisher is rated for use on:

A Class C extinguisher is specifically designed for use on energized electrical equipment. This classification indicates that the extinguisher is safe to use on electrical sources where there is a risk of shock or electrical conduction if a standard water-based extinguisher is employed. Class C extinguishing agents are typically non-conductive, making them suitable for tackling fires that involve appliances, wiring, or any equipment connected to a live electrical source.

Understanding the purpose of other classes of extinguishers further clarifies their specific uses. For example, a Class A extinguisher is intended for ordinary combustibles like wood, paper, and cloth, while a Class B extinguisher is meant for flammable liquids such as gasoline or oil. Class D extinguishers are used for fires involving certain metals that react adversely to water or other extinguishing agents. Therefore, the designation of a Class C extinguisher is critical for fire safety and ensuring the appropriate approach to handling electrical fires without introducing additional hazards.