A burning 9-amp electric motor requires which extinguisher class?

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Fires in electrical equipment require a Class C extinguisher because it is designed for energized electrical fires and uses non-conductive agents to avoid shock or further electrical issues. An electric motor burning is a live electrical fire, so you want an extinguisher that won’t conduct electricity and can safely interrupt the flame. Common Class C extinguishing agents include dry chemical powders and CO2, which are non-conductive and effective for this scenario. If power can be shut off safely, you could switch to an extinguisher appropriate for the fuel involved (for example, ordinary combustibles or flammable liquids), but at the moment of an energized motor fire, Class C is the correct choice. Class A handles ordinary combustibles like wood and paper, Class B handles flammable liquids, and Class D handles metal fires.