Tennessee Wastewater Operator Practice Exam

Which class of fire extinguisher is safe for use on electrically energized fires?

1. Class B

2. Class A

3. Class C

4. Class D

The correct answer is: Class C

Class C fire extinguishers are specifically designed for use on fires that involve energized electrical equipment. The extinguishing agents used in Class C extinguishers are non-conductive, which makes them safe for use around live electrical sources. When dealing with electrically energized fires, it is crucial to use an extinguisher that won’t conduct electricity, as this can prevent the risk of electric shock and ensure safety while attempting to extinguish the fire. Class A extinguishers are intended for ordinary combustibles such as wood, paper, and cloth, while Class B extinguishers are designed for flammable liquids and gases. Class D extinguishers are meant for combustible metals, which are unrelated to electrical fires. Knowing the specific class of fire extinguishers is vital for safe firefighting practices, especially in environments where electricity is present.