More than 40% of the energy used in the U.S. is consumed by building operations, including the electrical equipment and appliances within those buildings. While this equipment is essential to daily functionality in homes and business locations, ensuring that these appliances use energy efficiently is also gaining importance. Since the Energy Policy and Conservation Act of 1975 was amended, the U.S. Department of Energy (DOE) has been responsible for ensuring that appliances meet a minimum standard of energy and water efficiency. The DOE rules apply to over 60 different product types used in public and commercial applications, including transformers.

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