When fighting a class C fire, what should be done first?

When addressing a class C fire, which involves energized electrical equipment, the first priority is to deenergize all circuits. This is critical because a class C fire can pose significant safety risks, including electric shock to anyone attempting to extinguish the fire. By deenergizing circuits, you eliminate the risk of electricity flowing through any conductive material that may be in contact with the fire or the person attempting to fight it.

Taking this step first ensures that any firefighting efforts that follow will be conducted safely, preventing further hazards that could arise from an energized electrical situation. Once the circuits are deenergized, other firefighting measures, such as establishing fire boundaries or using appropriate extinguishing methods, can be safely implemented without the risk of electric shock or electrocution.