U.S. Department of Energy Integral Horsepower Motor Rule
7. Have a three or four digit NEMA frame size (or IEC metric equivalent), including those designs between two consecutive NEMA frame sizes (or IEC metric equivalent) or an enclosed 56 NEMA Frame size (or IEC metric equivalent).
Several categories of motors were previously covered at lower efficiency levels or exempt. These motors now must be produced to premium efficiency levels (NEMA MG 1-2014, Table 12-12 or 20B:
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Fire pump motors 1 – 500 HP will remain at energy efficient levels per NEMA MG 1, table 12-11.Fire pump motors 1 – 500 HP will remain at energy efficient levels per NEMA MG 1, table 12-11.
Even with expanded coverage, some motor types are still not covered:
- Single phase ODP motors (may be covered by Small Motor Rule)
- Single phase Enclosed motors
- DC motors
- Two digit frames (42 – 48) (may be covered by Small Motor Rule)
- 56 frame ODP (may be covered by Small Motor Rule)
- Multi-speed motors
- Medium voltage motors
- TEAO or Open Air-over motors
- Submersible motors
- Water-cooled motors
- Intermittent duty motors (S2-S8)
- Stator-rotor sets
- Design D motors
- Motors designed for Inverter Power (MG 1, Part 31) with no line start (Baldor V*S Master, RPM AC and similar)
- Synchronous AC motors
- Permanent magnet rotor AC motors
- Servo motors
Energy efficiency regulations in Canada and Mexico were not upgraded to match the U.S. levels at this time.