Firefighter Practice Exam

Which type of fire extinguisher is primarily used for electrical fires?

1. Water-based

2. Dry chemical

3. Foam

4. Class D

The correct answer is: Dry chemical

The correct choice for addressing electrical fires is the dry chemical fire extinguisher. These extinguishers contain a powder that effectively interrupts the chemical reaction of the fire. The agent used, typically monoammonium phosphate, is non-conductive, making it safe to use on electrical fires since it minimizes the risk of conducting electricity back to the user. In contrast, water-based extinguishers, such as those filled with water or foam, should never be used on electrical fires due to the risk of shock and further spreading the fire. Similarly, Class D extinguishers are designed specifically for combustible metals and are not appropriate for electrical fires. Foam extinguishers are also ineffective against electrical fires as they can conduct electricity and potentially cause harm. Therefore, the dry chemical extinguisher is the most versatile and safe choice for dealing with electrical incidents.