CFR > Title 10 - Energy > CHAPTER II—DEPARTMENT OF ENERGY > SUBCHAPTER D—ENERGY CONSERVATION (parts 400 to 491) > PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT > SUBPART B—Electric Motors (§431.11 to §431.36) > 431.25—Energy conservation standards and effective dates.

431.25—Energy conservation standards and effective dates.

(a) Each electric motor manufactured (alone or as a component of another piece of equipment) after October 24, 1997, or in the case of an electric motor which requires listing or certification by a nationally recognized safety testing laboratory, after October 24, 1999, shall have a nominal full load efficiency of not less than the following:
Motor horsepower/ standard kilowatt equivalent Nominal full load efficiency Open motors (number of poles) 6 4 2 Enclosed motors (number of poles) 6 4 2
1 / .75 80.0 82.5 80.0 82.5 75.5
1.5 / 1.1 84.0 84.0 82.5 85.5 84.0 82.5
2 / 1.5 85.5 84.0 84.0 86.5 84.0 84.0
3 / 2.2 86.5 86.5 84.0 87.5 87.5 85.5
5 / 3.7 87.5 87.5 85.5 87.5 87.5 87.5
Code of Federal Regulations 432
7.5 / 5.5 88.5 88.5 87.5 89.5 89.5 88.5
10 / 7.5 90.2 89.5 88.5 89.5 89.5 89.5
15 / 11 90.2 91.0 89.5 90.2 91.0 90.2
20 / 15 91.0 91.0 90.2 90.2 91.0 90.2
25 / 18.5 91.7 91.7 91.0 91.7 92.4 91.0
30 / 22 92.4 92.4 91.0 91.7 92.4 91.0
40 / 30 93.0 93.0 91.7 93.0 93.0 91.7
50 / 37 93.0 93.0 92.4 93.0 93.0 92.4
60 / 45 93.6 93.6 93.0 93.6 93.6 93.0
75 / 55 93.6 94.1 93.0 93.6 94.1 93.0
100 / 75 94.1 94.1 93.0 94.1 94.5 93.6
125 / 90 94.1 94.5 93.6 94.1 94.5 94.5
150 / 110 94.5 95.0 93.6 95.0 95.0 94.5
200 / 150 94.5 95.0 94.5 95.0 95.0 95.0
(b) For purposes of determining the required minimum nominal full load efficiency of an electric motor that has a horsepower or kilowatt rating between two horsepowers or kilowattages listed consecutively in paragraph (a) of this section, each such motor shall be deemed to have a horsepower or kilowatt rating that is listed in paragraph (a) of this section. The rating that the motor is deemed to have shall be determined as follows:
(1) A horsepower at or above the midpoint between the two consecutive horsepowers shall be rounded up to the higher of the two horsepowers;
(2) A horsepower below the midpoint between the two consecutive horsepowers shall be rounded down to the lower of the two horsepowers, or
(3) A kilowatt rating shall be directly converted from kilowatts to horsepower using the formula, 1 kilowatt = (1 / 0.746) horsepower, without calculating beyond three significant decimal places, and the resulting horsepower shall be rounded in accordance with paragraphs (b)(1) or (b)(2) of this section, whichever applies.
(c) Each general purpose electric motor (subtype I), except as provided in paragraph (d) of this section, with a power rating of 1 horsepower or greater, but not greater than 200 horsepower, manufactured (alone or as a component of another piece of equipment) on or after December 19, 2010, shall have a nominal full load efficiency that is not less than the following:
Full-Load Efficiencies of General Purpose Electric Motors
[Subtype I]
Motor horsepower Nominal full load efficiency Open motors(number of poles) 6 4 2 Enclosed motors(number of poles) 6 4 2
1 82.5 85.5 77.0 82.5 85.5 77.0
1.5 86.5 86.5 84.0 87.5 86.5 84.0
2 87.5 86.5 85.5 88.5 86.5 85.5
3 88.5 89.5 85.5 89.5 89.5 86.5
5 89.5 89.5 86.5 89.5 89.5 88.5
7.5 90.2 91.0 88.5 91.0 91.7 89.5
10 91.7 91.7 89.5 91.0 91.7 90.2
15 91.7 93.0 90.2 91.7 92.4 91.0
20 92.4 93.0 91.0 91.7 93.0 91.0
25 93.0 93.6 91.7 93.0 93.6 91.7
30 93.6 94.1 91.7 93.0 93.6 91.7
40 94.1 94.1 92.4 94.1 94.1 92.4
50 94.1 94.5 93.0 94.1 94.5 93.0
60 94.5 95.0 93.6 94.5 95.0 93.6
75 94.5 95.0 93.6 94.5 95.4 93.6
100 95.0 95.4 93.6 95.0 95.4 94.1
125 95.0 95.4 94.1 95.0 95.4 95.0
Code of Federal Regulations 433
150 95.4 95.8 94.1 95.8 95.8 95.0
200 95.4 95.8 95.0 95.8 96.2 95.4
(d) Each fire pump motor manufactured (alone or as a component of another piece of equipment) on or after December 19, 2010, shall have a nominal full load efficiency that is not less than the following:
Full-Load Efficiencies of Fire Pump Motors
Motor horsepower Nominal full load efficiency Open motors(number of poles) 8 6 4 2 Enclosed motors(number of poles) 8 6 4 2
1 74.0 80.0 82.5 74.0 80.0 82.5 75.5
1.5 75.5 84.0 84.0 82.5 77.0 85.5 84.0 82.5
2 85.5 85.5 84.0 84.0 82.5 86.5 84.0 84.0
3 86.5 86.5 86.5 84.0 84.0 87.5 87.5 85.5
5 87.5 87.5 87.5 85.5 85.5 87.5 87.5 87.5
7.5 88.5 88.5 88.5 87.5 85.5 89.5 89.5 88.5
10 89.5 90.2 89.5 88.5 88.5 89.5 89.5 89.5
15 89.5 90.2 91.0 89.5 88.5 90.2 91.0 90.2
20 90.2 91.0 91.0 90.2 89.5 90.2 91.0 90.2
25 90.2 91.7 91.7 91.0 89.5 91.7 92.4 91.0
30 91.0 92.4 92.4 91.0 91.0 91.7 92.4 91.0
40 91.0 93.0 93.0 91.7 91.0 93.0 93.0 91.7
50 91.7 93.0 93.0 92.4 91.7 93.0 93.0 92.4
60 92.4 93.6 93.6 93.0 91.7 93.6 93.6 93.0
75 93.6 93.6 94.1 93.0 93.0 93.6 94.1 93.0
100 93.6 94.1 94.1 93.0 93.0 94.1 94.5 93.6
125 93.6 94.1 94.5 93.6 93.6 94.1 94.5 94.5
150 93.6 94.5 95.0 93.6 93.6 95.0 95.0 94.5
200 93.6 94.5 95.0 94.5 94.1 95.0 95.0 95.0
250 94.5 95.4 95.4 94.5 94.5 95.0 95.0 95.4
300 95.4 95.4 95.0 95.0 95.4 95.4
350 95.4 95.4 95.0 95.0 95.4 95.4
400 95.4 95.4 95.4 95.4
450 95.8 95.8 95.4 95.4
500 95.8 95.8 95.8 95.4
(e) Each general purpose electric motor (subtype II) with a power rating of 1 horsepower or greater, but not greater than 200 horsepower, manufactured (alone or as a component of another piece of equipment) on or after December 19, 2010, shall have a nominal full load efficiency that is not less than the following:
Full-Load Efficiencies of General Purpose Electric Motors
[Subtype II]
Motor horsepower Nominal full load efficiency Open motors(number of poles) 8 6 4 2 Enclosed motors(number of poles) 8 6 4 2
1 74.0 80.0 82.5 74.0 80.0 82.5 75.5
1.5 75.5 84.0 84.0 82.5 77.0 85.5 84.0 82.5
Code of Federal Regulations 434
2 85.5 85.5 84.0 84.0 82.5 86.5 84.0 84.0
3 86.5 86.5 86.5 84.0 84.0 87.5 87.5 85.5
5 87.5 87.5 87.5 85.5 85.5 87.5 87.5 87.5
7.5 88.5 88.5 88.5 87.5 85.5 89.5 89.5 88.5
10 89.5 90.2 89.5 88.5 88.5 89.5 89.5 89.5
15 89.5 90.2 91.0 89.5 88.5 90.2 91.0 90.2
20 90.2 91.0 91.0 90.2 89.5 90.2 91.0 90.2
25 90.2 91.7 91.7 91.0 89.5 91.7 92.4 91.0
30 91.0 92.4 92.4 91.0 91.0 91.7 92.4 91.0
40 91.0 93.0 93.0 91.7 91.0 93.0 93.0 91.7
50 91.7 93.0 93.0 92.4 91.7 93.0 93.0 92.4
60 92.4 93.6 93.6 93.0 91.7 93.6 93.6 93.0
75 93.6 93.6 94.1 93.0 93.0 93.6 94.1 93.0
100 93.6 94.1 94.1 93.0 93.0 94.1 94.5 93.6
125 93.6 94.1 94.5 93.6 93.6 94.1 94.5 94.5
150 93.6 94.5 95.0 93.6 93.6 95.0 95.0 94.5
200 93.6 94.5 95.0 94.5 94.1 95.0 95.0 95.0
(f) Each NEMA Design B general purpose electric motor with a power rating of more than 200 horsepower, but not greater than 500 horsepower, manufactured (alone or as a component of another piece of equipment), on or after December 19, 2010, shall have a nominal full load efficiency that is not less than the following:
Full-Load Efficiencies of NEMA Design B General Purpose Electric Motors
Motor horsepower Nominal full load efficiency Open motors(number of poles) 8 6 4 2 Enclosed motors(number of poles) 8 6 4 2
250 94.5 95.4 95.4 94.5 94.5 95.0 95.0 95.4
300 95.4 95.4 95.0 95.0 95.4 95.4
350 95.4 95.4 95.0 95.0 95.4 95.4
400 95.4 95.4 95.4 95.4
450 95.8 95.8 95.4 95.4
500 95.8 95.8 95.8 95.4
(g) This section does not apply to definite purpose motors, special purpose motors, and those motors exempted by the Secretary.

Code of Federal Regulations

[69 FR 61923, Oct. 21, 2004, as amended at 74 FR 12071, Mar. 23, 2009; 75 FR 80292, Dec. 22, 2010]