Motors must be rated to withstand the physical and environmental conditions their operation subjects them to. The selection of the proper enclosure is vital to the successful safe operation of a motor. Motor performance and life can be significantly impacted by using a motor enclosure inappropriate for the application. An examination of the operating conditions of the motor environment will determine the most appropriate enclosure along with attention to applicable codes and standards.
The NEMA frame size of the motor you select depends upon the horsepower and speed you require. After choosing the motor, check the dimensions of that frame size to see if it fits in the space available.
If the standard motor does not fit, determine whether it is most economical to change the driven machine, use a different standard motor, or adapt the standard motor by using a mechanical modification or accessory.
And Furthermore . . .
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