NEMA Revises Standard for Measuring Distribution Transformer Loss


The National Electrical Manufacturers Assn. (NEMA) has published TP 2-2005, “Standard Test Method for Measuring the Energy Consumption of Distribution Transformers.” The standard provides a method for measurement of distribution transformer loss to achieve energy efficiency levels outlined in NEMA publication “TP 1, Guide for Determining Energy Efficiency for Distribution Transformers.”

“TP 2” was revised to address concerns raised by the U.S. Dept. of Energy with the previous edition. Under the Energy Policy and Conservation Act, DOE was tasked to develop rules to adopt test procedures for measuring the energy efficiency of distribution transformers. These revisions are intended to make TP 2 acceptable to DOE so that it will be adopted as the DOE test procedure.

Once the NEMA Transformer Section made the decision to revise the standard in response to DOE’s concerns, it was published within 12 months.

“The NEMA TP 2 standard is nationally recognized as the basis for testing procedures of distribution transformer energy efficiency standards,” says Kyle Pitsor, NEMA’s vice president of government relations. “It is specifically required for new federal energy efficiency standards based on NEMA TP 1 for low-voltage distribution transformers, and is also used and referenced by state governments and agencies. The new revision includes several important changes that were identified as part of a public regulatory discussion last year.”

TP 2-2005 may be viewed or purchased for $66.00 by visiting, or by contacting Global Engineering Documents at (800) 854-7179 (within the U.S.), (303) 397-7956 (international), or (303) 397-2740 (fax).

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