NEMA Premium Efficiency Levels Adopted as Federal Motor Efficiency Performance Standards
April 3, 2008 // Published as a news service by IHS
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On Dec. 19, 2007, the Energy Independence and Security Act of 2007 (EISA) was signed into law (Public Law 140-110).
The National Electrical Manufacturers Association (NEMA) participated in crafting major provisions on EISA. A critical provision that NEMA focused on was increased motor efficiency levels.
The Motor Generator section of NEMA joined the American Council for an Energy Efficient Economy to draft and recommend new motor efficiency regulations covering both general purpose and definite and special purpose electrical motors.
According to Rob Boteler, chairman of NEMA marketing committee, the cost of operating a typical electrical motor is over 95% power and only 5% initial cost and maintenance.
EISA will raise the motor efficiency level within 36 months of enactment helping to maximize the energy savings potential afforded by NEMA Premium efficient motors.
NEMA believes this action will help decrease U.S. reliance upon foreign sources of energy, and when used in conjunction with programs such as the U.S. Department of Energy (DOE) Save Energy Now will significantly reduce greenhouse gas emissions.
A summary of EISA standards for motors follows:
- General purpose motors (subtype I) manufactured after Dec. 19, 2010, with a power rating of at least 1 horsepower (HP) but not greater than 200 HP, shall have a nominal full-load efficiency that is not less than as defined in NEMA MG 1-2006 Table 12-12 ("NEMA Premium" efficiency levels).
- General purpose motor (subtype II), with a power rating of at least 1 HP but no more than 200 HP, manufactured after Dec. 19, 2010, shall have a nominal full-load efficiency that is not less than as defined in NEMA MG 1-2006 Table 12-11. Subtype II motors now include:
- U-frame motor.
- Design C motor.
- Close-coupled pump motor.
- Footless motor.
- Vertical solid-shaft normal thrust motor (tested in a horizontal configuration).
- 8-pole motor (900 rpm).
- Poly-phase motor with voltage of no more than 600 volts (other than 230 or 460 volts).
- Fire pump motors manufactured after Dec. 19, 2010 shall have nominal full-load efficiency no less than as defined in NEMA MG 1-2006 Table 12-11.
- NEMA Design B, general purpose electric motor, with a power rating at least 200 HP but no more than 500 HP, manufactured after December 19, 2010, shall have a nominal full-load efficiency that is not less than as defined in NEMA MG 1-2006 Table 12-11.
Source: National Electrical Manufacturers Association (NEMA).