10 C.F.R. § 431.196 Energy conservation standards and their effective dates.
Title 10 - Energy
(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 the following: (b) Liquid-Immersed Distribution Transformers. [Reserved] (c) Medium Voltage Dry-Type Distribution Transformers. [Reserved] [70 FR 60416, Oct. 18, 2005, as amended at 71 FR 24997, Apr. 27, 2006]
Title 10: Energy
PART 431—ENERGY EFFICIENCY PROGRAM FOR CERTAIN COMMERCIAL AND INDUSTRIAL EQUIPMENT
Subpart K—Distribution Transformers
Energy Conservation Standards
§ 431.196 Energy conservation standards and their effective dates.
---------------------------------------------------------------------------------------------------------------- Single phase Three phase---------------------------------------------------------------------------------------------------------------- Efficiency (%) Efficiency (%) kVA \1\ kVA \1\----------------------------------------------------------------------------------------------------------------15.............................................................. 97.7 15 97.025.............................................................. 98.0 30 97.537.5............................................................ 98.2 45 97.750.............................................................. 98.3 75 98.075.............................................................. 98.5 112.5 98.2100............................................................. 98.6 150 98.3167............................................................. 98.7 225 98.5250............................................................. 98.8 300 98.6333............................................................. 98.9 500 98.7 750 98.8 1000 98.9----------------------------------------------------------------------------------------------------------------\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.'')
