What is a key sign that indicates the presence of a Class C fire?

The presence of energized electrical equipment is a key sign indicating a Class C fire. Class C fires are specifically associated with energized electrical equipment such as motors, transformers, and appliances. This type of fire can be ignited by faulty wiring, overloaded circuits, or malfunctioning devices.

Recognizing the presence of energized electrical equipment is critical because using water or certain fire-fighting agents on a Class C fire can create a risk of electric shock or further complications. Therefore, specialized extinguishing agents, such as those designed for electrical fires, must be used to safely mitigate the hazard. Identifying this sign helps ensure that proper safety measures are taken when dealing with potential electrical fire situations.