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This diagram illustrates the relative positions of various standards applicable to motors (power and efficiency)
NEMA PremiumTM motors or better
NEMA PremiumTM motors are more efficient, in accordance with NEMA PremiumTM, MG-1 2003 voluntary standard applicable to motors of 1 to 500 hp.
The National Electrical Manufacturers Association (NEMA) has developed a voluntary standard for motors that exceed the minimum efficiency stipulated in the U.S. Energy Policy Act of 1992 (EPAct 1992), or standard CAN/CSA-C390-98 in Canada.
The NEMA PremiumTM standard also specifies minimum efficiencies for motors more powerful than the maximum of 200 hp covered by EPAct 1992 (CAN/CSA-C390-98). Motors may be up to 500 hp at 5,000 V and less.
Big manufacturers around the world are designing motors that meet or even exceed the NEMA PremiumTM efficiency standard.
In Canada, such motors are known as NEMA PremiumTM motors or premium efficiency motors. Their nameplates indicate NEMA PremiumTM.
See the table of NEMA PremiumTM efficiencies
Comparative efficiency
NEMA PremiumTM motors are:
- 1.5–5% more efficient than standard motors
- 1–3% more efficient than EPAct motors
EPAct motors meet Canadian standard CSA/CAN-390-98 (equivalent to U.S. Energy Policy Act standards of 1992) applicable to AC induction motors rated up to 200 hp.
General-purpose AC induction motors of up to 200 hp are covered by the federal Energy Efficiency Act and the Energy Efficiency Regulations, under which all motors sold in Canada must be "energy efficient"; they must therefore meet the minimum energy efficiency criteria of CAN/CSA-C390-98.
In Canada, such efficient motors are known as EPAct motors.
See the table of CSA/CAN-390-98 (EPAct) standard efficiencies.
Most motors used in industry are standard motors acquired before 1998, and they do comply with CSA/CAN-390-98 (or EPAct 1992).
Non-compliant motors are considered to be standard motors. The most commonly used are those acquired before the latest federal Energy Efficiency Regulations of 1998 were brought in.