What type of extinguisher should you use for an electrical fire?

Using a Class B:C extinguisher for an electrical fire is correct because these extinguishers are specifically designed for fires involving flammable liquids and electrical equipment. The "B" classification targets flammable liquids and gases, while the "C" signifies that the extinguisher is suitable for use on energized electrical equipment. This is crucial because using a water extinguisher or a Class A extinguisher on an electrical fire can lead to severe injury or further escalation of the fire due to the conductivity of water. Foam extinguishers can also be ineffective or dangerous on live electrical equipment because they may conduct electricity. Therefore, a Class B:C extinguisher is the safest and most effective choice for addressing electrical fires.