NEMA kVA Code Letter M and Locked-Rotor Value

What is the locked-rotor value of a motor with a NEMA kVA code letter of M?

A. 4.0-4.99 kVA/hp
B. 4.5-4.99 kVA/hp
C. 5.0-5.99 kVA/hp
D. 10.0-11.19 kVA/hp

Answer:

A motor with a NEMA kVA code letter of M has a locked-rotor value of 5.0-5.99 kVA/hp.

The locked-rotor kVA code letter of a motor indicates the locked-rotor apparent power per horse power that the motor draws during a locked-rotor condition. For a motor with a NEMA kVA code letter of M, the locked-rotor value falls within the range of 5.0-5.99 kVA/hp. This information is crucial when dealing with NEMA motor ratings.

The NEMA kVA code letters are established by the National Electrical Manufacturers Association (NEMA) to provide standardized information on motor performance and characteristics. Understanding the locked-rotor value associated with a specific kVA code letter can help determine the motor's behavior under certain conditions, such as when the motor is unable to rotate freely.