Oilers/Plant Tenders (HHC) Civil Service Practice Exam

The type of fire extinguisher that should be used for fighting an electrical fire is __________.

1. Water

2. Foam

3. Carbon Dioxide

4. Dry powder

The correct answer is: Carbon Dioxide

Using a carbon dioxide fire extinguisher for electrical fires is the correct choice because it is specifically designed to safely eliminate flames in such environments. Carbon dioxide is non-conductive, meaning it won’t conduct electricity and pose a risk of shock or further ignition when applied to electrical equipment. Additionally, carbon dioxide displaces oxygen in the vicinity of the fire without leaving a residue, which is important for protecting sensitive electrical components. Water and foam extinguishers are inappropriate for electrical fires because they are conductive and can increase the risk of electrical shock or further incidents. Dry powder extinguishers can sometimes be used on electrical fires, but they are generally more suited for combustible materials and are not as effective as carbon dioxide in this specific scenario. Thus, carbon dioxide remains the preferred option for safely addressing electrical fires.