10 CFR 431.196 - Energy conservation standards and their effective dates.

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§ 431.196 Energy conservation standards and their effective dates.
(a) Low-Voltage Dry-Type Distribution Transformers. The efficiency of a low-voltage dry-type distribution transformer manufactured on or after January 1, 2007, shall be no less than that required for their kVA rating in the table below. Low-voltage dry-type distribution transformers with kVA ratings not appearing in the table shall have their minimum efficiency level determined by linear interpolation of the kVA and efficiency values immediately above and below that kVA rating.
Single phase Three phase
kVA Efficiency (%) 1 kVA Efficiency (%) 1
1 Efficiencies are determined at the following reference conditions: (1) for no-load losses, at the temperature of 20 °C, and (2) for load-losses, at the temperature of 75 °C and 35 percent of nameplate load.
(Source: Table 4-2 of National Electrical Manufacturers Association (NEMA) Standard TP-1-2002, “Guide for Determining Energy Efficiency for Distribution Transformers.”)
15 97.7 15 97.0
25 98.0 30 97.5
37.5 98.2 45 97.7
50 98.3 75 98.0
75 98.5 112.5 98.2
100 98.6 150 98.3
167 98.7 225 98.5
250 98.8 300 98.6
333 98.9 500 98.7
750 98.8
1000 98.9
(b) Liquid-Immersed Distribution Transformers. The efficiency of a liquid-immersed distribution transformer manufactured on or after January 1, 2010, shall be no less than that required for their kVA rating in the table below. Liquid-immersed distribution transformers with kVA ratings not appearing in the table shall have their minimum efficiency level determined by linear interpolation of the kVA and efficiency values immediately above and below that kVA rating.
Single-phase Three-phase
kVA Efficiency (%) kVA Efficiency (%)
Note: All efficiency values are at 50 percent of nameplate-rated load, determined according to the DOE Test-Procedure. 10 CFR Part 431, Subpart K, Appendix A.
10 98.62 15 98.36
15 98.76 30 98.62
25 98.91 45 98.76
37.5 99.01 75 98.91
50 99.08 112.5 99.01
75 99.17 150 99.08
100 99.23 225 99.17
167 99.25 300 99.23
250 99.32 500 99.25
333 99.36 750 99.32
500 99.42 1000 99.36
667 99.46 1500 99.42
833 99.49 2000 99.46
2500 99.49
(c) Medium-Voltage Dry-Type Distribution Transformers. The efficiency of a medium-voltage dry-type distribution transformer manufactured on or after January 1, 2010, shall be no less than that required for their kVA and BIL rating in the table below. Medium-voltage dry-type distribution transformers with kVA ratings not appearing in the table shall have their minimum efficiency level determined by linear interpolation of the kVA and efficiency values immediately above and below that kVA rating.
Table I.2—Standard Levels for Medium-Voltage, Dry-Type Distribution Transformers, Tabular Form
Single-phase Three-phase
BILkVA 20-45 kVefficiency (%) 46-95 kVefficiency (%) ≥96 kVefficiency (%) BILkVA 20-45 kVefficiency (%) 46-95 kVefficiency (%) ≥96 kVefficiency (%)
Note: BIL means basic impulse insulation level.
Note: All efficiency values are at 50 percent of nameplate rated load, determined according to the DOE Test-
Procedure. 10 CFR Part 431, Subpart K, Appendix A.
15 98.10 97.86 15 97.50 97.18
25 98.33 98.12 30 97.90 97.63
37.5 98.49 98.30 45 98.10 97.86
50 98.60 98.42 75 98.33 98.12
75 98.73 98.57 98.53 112.5 98.49 98.30
100 98.82 98.67 98.63 150 98.60 98.42
167 98.96 98.83 98.80 225 98.73 98.57 98.53
250 99.07 98.95 98.91 300 98.82 98.67 98.63
333 99.14 99.03 98.99 500 98.96 98.83 98.80
500 99.22 99.12 99.09 750 99.07 98.95 98.91
667 99.27 99.18 99.15 1000 99.14 99.03 98.99
833 99.31 99.23 99.20 1500 99.22 99.12 99.09
2000 99.27 99.18 99.15
2500 99.31 99.23 99.20
(d) Underground Mining Distribution Transformers. [Reserved]
[70 FR 60416, Oct. 18, 2005, as amended at 71 FR 24997, Apr. 27, 2006; 72 FR 58239, Oct. 12, 2007]

Title 10 published on 2014-01-01

The following are only the Rules published in the Federal Register after the published date of Title 10.

For a complete list of all Rules, Proposed Rules, and Notices view the Rulemaking tab.

  • 2014-07-11; vol. 79 # 133 - Friday, July 11, 2014
    1. 79 FR 40542 - Energy Conservation Program for Consumer Products and Certain Commercial and Industrial Equipment: Test Procedures for Residential and Commercial Water Heaters
      GPO FDSys XML | Text
      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Final rule.
      The effective date of this rule is July 13, 2015. Compliance will be mandatory starting one year after the publication in the Federal Register of a mathematical conversion factor to convert from the existing efficiency ratings to efficiency ratings under the test procedure adopted by this final rule, or December 31, 2015, whichever is later. The incorporation by reference of certain publications listed in this rule is approved by the Director of the Federal Register as of July 13, 2015. Other publications referenced were approved on March 23, 2009, and May 16, 2012.
      10 CFR Parts 429, 430, and 431

Title 10 published on 2014-01-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 10 CFR 431 after this date.

  • 2014-09-16; vol. 79 # 179 - Tuesday, September 16, 2014
    1. 79 FR 55538 - Energy Conservation Program: Energy Conservation Standards for Packaged Terminal Air Conditioners and Packaged Terminal Heat Pumps
      GPO FDSys XML | Text
      DEPARTMENT OF ENERGY, Office of Energy Efficiency and Renewable Energy
      Notice of proposed rulemaking (NOPR) and public meeting.
      DOE will hold a public meeting on Wednesday, October 29, 2014, from 9 a.m. to 4 p.m., in Washington, DC. The meeting will also be broadcast as a webinar. See section VII, “Public Participation,” for webinar registration information, participant instructions, and information about the capabilities available to webinar participants. DOE will accept comments, data, and information regarding this notice of proposed rulemaking (NOPR) before and after the public meeting, but no later than November 17, 2014. See section VII, “Public Participation” for details.
      10 CFR Part 431