What is typically used to combat Class C fires?

Class C fires involve energized electrical equipment, so the key factor in combating these fires is to use an extinguishing agent that will not conduct electricity and can safely put out the flames without risking shock or further electrical hazards.

CO2 extinguishers are particularly effective for Class C fires because they displace oxygen, thus suffocating the fire, and they do not leave any residue that could potentially damage electrical equipment. This characteristic makes them a preferred choice in environments where electrical equipment is present.

In contrast, using water-based extinguishers is not advisable on Class C fires because water conducts electricity, which could lead to electrocution of the person extinguishing the fire and exacerbate the situation. Dry chemical extinguishers can potentially be used, but they can leave a residue that may damage sensitive equipment and could also create a risk of electrical shock if not used properly. Foam extinguishers are also not suitable as they are typically used for Class A and B fires and can conduct electricity due to their water content.