What type of fire extinguisher is best suited for an electrical motor fire?

A carbon dioxide extinguisher is best suited for an electrical motor fire because it effectively displaces oxygen around the fire while also cooling the surrounding area. CO2 is non-conductive and does not leave any residue, making it ideal for extinguishing fires involving electrical equipment, including motors. This type of extinguisher works by removing oxygen from the fire triangle, which is necessary for combustion, thereby suffocating the fire without the risk of electrical conduction that could arise from other types of extinguishing agents.

Using water extinguishers can be dangerous in electrical fires, as water is a conductor and can lead to electric shock or worsen the situation. Foam extinguishers are not suitable for electrical fires as they may conduct electricity as well. Powder extinguishers can be effective, but they may not be as efficient as carbon dioxide for situations involving sensitive electrical equipment, where residue cleanup can be a concern.