Registered Polysomnographic Technologist Practice Exam

A Class C fire involves flammable materials that are energized by electricity, making it crucial to use an extinguisher that does not conduct electricity. A carbon dioxide or dry chemical extinguisher is specifically designed to handle such fires safely.

Carbon dioxide extinguishers work by displacing oxygen and can effectively suffocate the fire without leaving any residue, which is important when dealing with electrical equipment. Dry chemical extinguishers, such as those containing monoammonium phosphate, also do not conduct electricity and are effective for various types of fires, including Class C.

Using a water extinguisher for electrical fires is dangerous, as water conducts electricity and can lead to electrocution. AFFF (Aqueous Film Forming Foam) extinguisher is typically suitable for Class B fires (flammable liquids) and would not be appropriate for Class C fires. Lastly, foam extinguishers are primarily designed for Class B fires and would also pose a risk if used on live electrical equipment. Therefore, the choice of a carbon dioxide or dry chemical extinguisher aligns with safety protocols for managing Class C fires involving electrical equipment.