A fire involving which of the following is classified as a Class "C" fire?

A Class "C" fire specifically refers to fires that involve electrical equipment. This classification is critical because electrical fires behave differently than other types of fires. In the case of an electrical panel, the fire can occur due to various electrical failures, such as a short circuit or overload.

When responding to a Class "C" fire, conventional extinguishing agents like water are typically not suitable, as they can create additional hazards, including electric shock or further electrical faults. Instead, fire extinguishers rated for Class "C" fires, which often utilize non-conductive agents, are recommended to safely extinguish the flames without introducing dangers associated with water.

In contrast, the other options involve materials that classify as Class "A" or Class "B" fires—wood and coal being organic solids that can ignite and burn, and fuel tanks relating to flammable liquids or gases. Understanding these classifications is vital for selecting the appropriate fire-fighting techniques and ensuring safety during an emergency response.