Basic Operations Firefighter Certification Practice Exam

Which type of fire extinguisher is specifically designed for fires involving electrical equipment?

1. Water-based extinguisher

2. Foam extinguisher

3. Carbon dioxide extinguisher

4. Dry powder extinguisher

The correct answer is: Carbon dioxide extinguisher

The carbon dioxide extinguisher is specifically designed for fires involving electrical equipment due to its unique properties. When CO2 is released from the extinguisher, it displaces oxygen in the vicinity of the fire, effectively suffocating it while not conducting electricity. This makes it safe to use on live electrical equipment, unlike other types of extinguishers that may introduce conductive materials or additional risks. For instance, a water-based extinguisher is not suitable for electrical fires, as water is a conductor of electricity and can pose a serious risk of electrical shock. Similarly, foam extinguishers are effective on flammable liquids and are not suitable for electrical fires due to their water content. Dry powder extinguishers can be used on electrical fires, but CO2 extinguishers are preferred because they do not leave residue, making cleanup easier and ensuring that sensitive electrical equipment remains undamaged.