What is the effect of continued overload or under voltage on operating motors?

Continued overload or under voltage on operating motors leads to heating that can destroy the insulation. When a motor operates under these conditions, it draws excessive current or operates inefficiently, causing it to generate more heat than it was designed to handle. This overheating can degrade or completely ruin the motor's insulation material, which is critical for maintaining safe and effective operation.

Insulation failure often leads to short circuits, which can create a dangerous situation and result in costly motor replacement or repair. Maintaining proper voltage and load conditions is essential to ensuring the reliability and longevity of a motor’s operation. The other options do not accurately reflect the severe consequences of overloading or under-voltage situations on motor components and performance.