Public Law 109-58 of the Energy Policy Act of 2005
requires the manufacturing of Energy Efficient Transformers after January 1, 2007 for all General Purpose Distribution Applications. Energy Efficient Transformers meet Table 4-2
of The Guide for Determining Energy Efficiency for Distribution Transformers, published by the National Electrical Manufacturers Association
® (NEMA TP1–2002), set at 24-hour average loading of 35 percent. Energy Savings calculations are available at SquareDleantools.com.