NEMA
NEMA is a major player in the electrical motor world and they set standards for sizes and emissions then try to make them industry standards. This standardization is designed to make the most money for their clients.
NEMA Enclosures
NEMA puts specifications on how a motor should be covered to improve performance and reduce the risk of material like leaves collecting and damaging the motor. They offer many different enclosure types to end users that benefit economy and safety of the motors.
NEMA Specifications
NEMA makes standard specifications on electrical motors and then sells them through IHS, a global seller of standards in a variety of industries. These standards are issued based on energy consumption and polution output.