Which type of fire extinguisher is NOT designed for use on electrical fires?

Type A fire extinguishers are designed for ordinary combustibles such as wood, paper, and cloth. They typically contain water or a water-based solution, making them ineffective and dangerous to use on electrical fires, which can be caused by live wires or equipment. When water is applied to an electrical fire, it can conduct electricity and increase the risk of shock or further fire hazards.

Type B and Type C extinguishers, on the other hand, are specifically designed for flammable liquids and electrical fires, respectively. Type D extinguishers are intended for combustible metals, which are not relevant in this context. Therefore, the option related to Type A is the one that lacks suitability for extinguishing electrical fires.