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Electronic Code of Federal Regulations

e-CFR data is current as of November 7, 2019

Title 10Chapter IISubchapter DPart 431Subpart K → §431.196


Title 10: Energy
PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT
Subpart K—Distribution Transformers


§431.196   Energy conservation standards and their effective dates.

(a) Low-Voltage Dry-Type Distribution Transformers. (1) The efficiency of a low-voltage, dry-type distribution transformer manufactured on or after January 1, 2007, but before January 1, 2016, shall be no less than that required for the applicable 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-phaseThree-phase
kVA%kVA%
1597.71597.0
2598.03097.5
37.598.24597.7
5098.37598.0
7598.5112.598.2
10098.615098.3
16798.722598.5
25098.830098.6
33398.950098.7
   75098.8
   100098.9

Note: All efficiency values are at 35 percent of nameplate-rated load, determined according to the DOE Test Method for Measuring the Energy Consumption of Distribution Transformers under Appendix A to Subpart K of 10 CFR part 431.

(2) The efficiency of a low-voltage dry-type distribution transformer manufactured on or after January 1, 2016, 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-phaseThree-phase
kVAEfficiency
(%)
kVAEfficiency
(%)
1597.701597.89
2598.003098.23
37.598.204598.40
5098.307598.60
7598.50112.598.74
10098.6015098.83
16798.7022598.94
25098.8030099.02
33398.9050099.14
   75099.23
   100099.28

Note: All efficiency values are at 35 percent of nameplate-rated load, determined according to the DOE Test Method for Measuring the Energy Consumption of Distribution Transformers under Appendix A to Subpart K of 10 CFR part 431.

(b) Liquid-Immersed Distribution Transformers. (1) The efficiency of a liquid-immersed distribution transformer manufactured on or after January 1, 2010, but before January 1, 2016, 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-phaseThree-phase
kVAEfficiency
(%)
kVAEfficiency
(%)
1098.621598.36
1598.763098.62
2598.914598.76
37.599.017598.91
5099.08112.599.01
7599.1715099.08
10099.2322599.17
16799.2530099.23
25099.3250099.25
33399.3675099.32
50099.42100099.36
66799.46150099.42
83399.49200099.46
   250099.49

Note: All efficiency values are at 50 percent of nameplate-rated load, determined according to the DOE Test—Procedure, Appendix A to Subpart K of 10 CFR part 431.

(2) The efficiency of a liquid-immersed distribution transformer manufactured on or after January 1, 2016, 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-phaseThree-phase
kVAEfficiency
(%)
kVAEfficiency
(%)
1098.701598.65
1598.823098.83
2598.954598.92
37.599.057599.03
5099.11112.599.11
7599.1915099.16
10099.2522599.23
16799.3330099.27
25099.3950099.35
33399.4375099.40
50099.49100099.43
66799.52150099.48
83399.55200099.51
   250099.53

Note: All efficiency values are at 50 percent of nameplate-rated load, determined according to the DOE Test Method for Measuring the Energy Consumption of Distribution Transformers under Appendix A to Subpart K of 10 CFR part 431.

(c) Medium-Voltage Dry-Type Distribution Transformers. (1) The efficiency of a medium-voltage dry-type distribution transformer manufactured on or after January 1, 2010, but before January 1, 2016, 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.

Single-phaseThree-phase
kVABIL*kVABIL
20-45 kV46-95 kV≥96 kV20-45 kV46-95 kV≥96 kV
Efficiency
(%)
Efficiency
(%)
Efficiency
(%)
Efficiency
(%)
Efficiency
(%)
Efficiency
(%)
1598.1097.861597.5097.18
2598.3398.123097.9097.63
37.598.4998.304598.1097.86
5098.6098.427598.3398.12
7598.7398.5798.53112.598.4998.30
10098.8298.6798.6315098.6098.42
16798.9698.8398.8022598.7398.5798.53
25099.0798.9598.9130098.8298.6798.63
33399.1499.0398.9950098.9698.8398.80
50099.2299.1299.0975099.0798.9598.91
66799.2799.1899.15100099.1499.0398.99
83399.3199.2399.20150099.2299.1299.09
200099.2799.1899.15
250099.3199.2399.20

*BIL means basic impulse insulation level.

Note: All efficiency values are at 50 percent of nameplate rated load, determined according to the DOE Test Method for Measuring the Energy Consumption of Distribution Transformers under Appendix A to Subpart K of 10 CFR part 431.

(2) The efficiency of a medium- voltage dry-type distribution transformer manufactured on or after January 1, 2016, 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.

Single-phaseThree-phase
kVABIL*kVABIL
20-45 kV46-95 kV≥96 kV20-45 kV46-95 kV≥96 kV
Efficiency
(%)
Efficiency
(%)
Efficiency
(%)
Efficiency
(%)
Efficiency
(%)
Efficiency
(%)
1598.1097.861597.5097.18
2598.3398.123097.9097.63
37.598.4998.304598.1097.86
5098.6098.427598.3398.13
7598.7398.5798.53112.598.5298.36
10098.8298.6798.6315098.6598.51
16798.9698.8398.8022598.8298.6998.57
25099.0798.9598.9130098.9398.8198.69
33399.1499.0398.9950099.0998.9998.89
50099.2299.1299.0975099.2199.1299.02
66799.2799.1899.15100099.2899.2099.11
83399.3199.2399.20150099.3799.3099.21
   200099.4399.3699.28
   250099.4799.4199.33

*BIL means basic impulse insulation level.

Note: All efficiency values are at 50 percent of nameplate rated load, determined according to the DOE Test Method for Measuring the Energy Consumption of Distribution Transformers under Appendix A to Subpart K of 10 CFR part 431.

(d) Mining Distribution Transformers. [Reserved]

[78 FR 23433, Apr. 18, 2013]

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