What occurs if voltage is applied across two speed terminals on a fan motor?

When voltage is applied across two speed terminals on a fan motor, there is a potential for significant damage to the motor, which can lead to a burnout. Fan motors are designed to operate at specific voltage levels on predetermined terminals corresponding to different speed settings. When an incorrect voltage is applied, or if two speed terminals are energized simultaneously, the electrical current may exceed the motor's designed capacity. This can cause excess heat buildup, leading to insulation breakdown and ultimately resulting in the motor burning out.

Understanding the implications of improper voltage application is crucial for maintenance and troubleshooting of fan motors. This helps ensure equipment longevity and safety, as operating a motor outside its specified parameters can create dangerous conditions, including electrical shorts or fires.