What is the primary extinguishing method for Class C fires?

The primary extinguishing method for Class C fires is carbon dioxide because these types of fires involve energized electrical equipment. Carbon dioxide is effective in these situations because it displaces oxygen, which is necessary for combustion, while also being non-conductive and safe to use on electrical fires.

Using carbon dioxide allows for safe application directly on live electrical equipment without the risk of electrical shock. Additionally, it leaves no residue, making it suitable for areas where cleanup after extinguishing a fire is a concern.

In contrast, other extinguishing agents, such as water, can conduct electricity and pose a hazard if used on energized equipment. Foam and halon may have their applications, but they are not the preferred methods for Class C fires due to their potential reactions with electrical sources or the lingering effects they can have on sensitive electronic equipment.