The allowable voltage variation above or below the value stamped on a motor's nameplate is what percentage?

The allowable voltage variation for electric motors is often specified as being within 10% of the nameplate value. This percentage accounts for typical fluctuations that can occur in electrical systems due to load changes, voltage drop in wiring, or other factors. Operating a motor within this range helps to ensure optimal performance, efficiency, and longevity of the motor.

When the voltage deviates beyond this 10% threshold, it can lead to issues such as overheating, reduced efficiency, and impaired operation of the motor, which can ultimately lead to increased wear and potential failure. Hence, it's crucial for operators to monitor voltage levels closely to stay within this acceptable variation.

Understanding this percentage is vital when assessing motor performance and application in various systems, ensuring that motors operate safely and effectively within their designed parameters.