NATE Air Conditioning and Heat Pumps Practice Exam 2026 – All-in-One Guide to Master Your Certification!

The correct response reflects acceptable variations in voltage for motors, which can typically handle a fluctuation of ±10% from their rated voltage. This tolerance for voltage variation is important because it allows motors to operate efficiently under a range of conditions without experiencing significant negative effects.

When a motor is designed, its performance characteristics, such as torque and efficiency, are optimized for a specific rated voltage. However, real-world conditions can lead to minor fluctuations in voltage supply due to factors like load changes or variations in the electrical grid. Therefore, allowing for a range of +10% to -10% ensures that the motor can function reliably even if there are slight deviations from the ideal supply voltage.

This range allows for more flexibility and is crucial in preventing issues such as overheating or underperformance, which can occur if the voltage strays too far from the rated levels. Understanding these tolerances is vital for proper installation and maintenance of motors in various applications.