---
kind: "section"
citation: "10 C.F.R. § 431.446"
title: "10"
number: "431.446"
heading: "Small electric motors energy conservation standards and their effective dates."
url: "https://uscodex.org/cfr/10/431.446"
---

# §431.446. Small electric motors energy conservation standards and their effective dates.

- (a) Each small electric motor manufactured (alone or as a component of another piece of non-covered equipment) after March 9, 2015, or in the case of a small electric motor which requires listing or certification by a nationally recognized safety testing laboratory, after March 9, 2017, shall have an average full load efficiency of not less than the following:
- (b) For purposes of determining the required minimum average full load efficiency of an electric motor that has a horsepower or kilowatt rating between two horsepower or two kilowatt ratings listed in any table of efficiency standards in [paragraph (a)](#a) of this section, each such motor shall be deemed to have a listed horsepower or kilowatt rating, determined as follows:
  - (1) A horsepower at or above the midpoint between the two consecutive horsepower ratings shall be rounded up to the higher of the two horsepower ratings;
  - (2) A horsepower below the midpoint between the two consecutive horsepower ratings shall be rounded down to the lower of the two horsepower ratings; or
  - (3) A kilowatt rating shall be directly converted from kilowatts to horsepower using the formula 1 kilowatt = (1/0.746) hp, without calculating beyond three significant decimal places, and the resulting horsepower shall be rounded in accordance with paragraphs [(b)(1)](#b-1) or [(b)(2)](#b-2) of this section, whichever applies.

## Notes

### Amendments

[75 FR 10947, Mar. 9, 2010; 75 FR 17036, Apr. 5, 2010]

### Source

Source: 74 FR 32072, July 7, 2009, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 6291-6317; 28 U.S.C. 2461 note.

### Source

Source: 64 FR 54141, Oct. 5, 1999, unless otherwise noted.

### Amendments

[75 FR 10947, Mar. 9, 2010; 75 FR 17036, Apr. 5, 2010]