Which type of fire extinguisher is best suited for fires involving electrically energized sources?

Type C extinguishers are specifically designed for fires involving electrically energized sources. These fires can occur in electrical equipment such as wiring, circuit breakers, and appliances, where the risk of shock and re-ignition is significant. The contents of a Type C extinguisher are typically non-conductive, allowing it to put out the flames without posing a risk of electrocution to the user.

Type A extinguishers are primarily used for ordinary combustible materials like wood, paper, and textiles, and are not suitable for electrical fires. Type B extinguishers are effective for flammable liquids and gases, and while they may be useful in certain scenarios, they still do not address the specific risks associated with electrical fires. Type D extinguishers are intended for combustible metals, which are not related to electrical fires at all. Therefore, Type C extinguishers are the correct choice for safely handling fires involving electrically energized sources.