Which type of fire extinguisher is not typically used for electrical fires?

Water extinguishers are not suitable for use on electrical fires due to the conductive nature of water. When water comes into contact with live electrical equipment, it can create a severe electric shock hazard to the operator and increase the risk of further damage or fire spread.

In contrast, carbon dioxide extinguishers work by displacing oxygen in the vicinity of the fire, making them safe and effective for extinguishing fires involving electrical equipment. Dry chemical extinguishers also provide excellent fire suppression for electrical fires by interrupting the chemical reaction of the fire without conducting electricity. Foam extinguishers are generally ineffective on electrical fires as well, primarily because they can also conduct electricity; however, they are designed primarily for flammable liquid fires.

The key point here is the inherent risk associated with using water on electrical fires, making water extinguishers an inappropriate choice for addressing these types of emergencies.