Which fire extinguisher type is effective against Class C fires?

The correct choice for effectively combating Class C fires is the dry chemical extinguisher. Class C fires involve energized electrical equipment, and it is crucial to use extinguishing agents that do not conduct electricity to prevent further hazards. Dry chemical extinguishers work by interrupting the chemical reaction of the fire and are formulated specifically to handle electrical fires safely.

While carbon dioxide extinguishers are also effective against Class C fires, the dry chemical extinguisher is often cited as the primary choice due to its versatility in handling a broader range of fire types, and it is effective in suppressing the immediate fire while ensuring the electrical components are not damaged or re-energized accidentally.

Foam extinguishers are typically used for Class B fires (flammable liquids) and are not suitable for extinguishing electrical fires as the foam can conduct electricity. Water extinguishers are effective for Class A fires (ordinary combustibles) but can pose a severe risk if used on electrical fires, as water conducts electricity and can cause electrical shock or equipment damage.