Which of the following statements about extinguishing Class C fires is accurate?

The accurate statement regarding extinguishing Class C fires is that electrical circuits must be de-energized before extinguishing. This is crucial because Class C fires involve energized electrical equipment, which poses a significant risk of electrocution to anyone attempting to combat the fire using water or other conductive materials.

When dealing with Class C fires, the safest course of action is to turn off the electrical source before applying any extinguishing agent. Once the circuit is de-energized, various extinguishing agents, such as dry chemical or CO2 fire extinguishers, can be effectively and safely used. This ensures that the fire can be extinguished without the risk of further injury from electrical shock.

Other options are misleading or inaccurate in various ways. For example, using water on electrical fires can cause severe safety hazards, and foam is not the only option available once the power is cut. It's important to understand that specific protocols must be followed to ensure safe fire suppression practices, particularly when dealing with electrical fires.