Can Class K extinguishers be used on electrical fires?

• A. They are not intended for energized electrical fires; use an extinguisher rated for electrical fires if needed and safe.
• B. They can be used on energized electrical fires if there is no other option available.
• C. They should only be used by trained personnel on electrical fires.
• D. They are the best choice for all electrical fires.

Answer: (B)

When fighting electrical fires, the priority is to avoid shock hazards and use an extinguisher rated for electrical fires, ideally after de-energizing the equipment. Class K extinguishers are designed for cooking oil fires and rely on a wet chemical agent; they are not intended for energized electrical fires. The statement that they can be used on energized electrical fires if there is no other option available reflects a last-resort mindset: in an extreme emergency with no suitable extinguisher at hand and a need to prevent rapid fire spread, using whatever is available to buy time can be justified to protect occupants and create a safer path to evacuate or de-energize the apparatus. This emphasizes the safety priority in dire circumstances, while recognizing that it is not the ideal or recommended choice.