scope:

Three-phase and single-phase ac synchronous and induction electric motors in sizes from fractional horsepower and larger are covered in this guide. Primary emphasis is on the use of general-purpose enclosures and precautions against excessive surface temperatures and sparking of rotor bars and enclosure joints. This guide provides guidance for maintaining the life-cycle integrity of motors in Class I, Division 2 locations.

This guide does not cover ac wound rotor motors and dc electric motors. Motors installed in locations other than Class I, Division 2 locations are not covered in this guide.

The voltage breaks in this document are a) 1000V and less and b) over 1000V.