Which class of fire involves energized electrical equipment?

The class of fire that involves energized electrical equipment is Class C. This classification is designed specifically for fires that involve electrical components, such as wiring, circuit breakers, and electrical appliances. The key characteristic of Class C fires is that the materials involved are energized and present a risk of shock or electrocution if water or non-insulated extinguishing methods are used.

When mitigating a Class C fire, it is crucial to first ensure that the electrical power has been turned off to the equipment involved before applying any direct extinguishing agent. Fire extinguishers classified for Class C fires are often filled with non-conductive agents, such as carbon dioxide or dry chemical suppressants, which effectively extinguish the flames without risking electrical hazards.

Understanding this classification is critical for safety in firefighting, as the approach to handling a Class C fire differs significantly from that of fires involving ordinary combustibles, flammable liquids, or combustible metals. This differentiation helps ensure both effective firefighting and the safety of personnel handling the fire.