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The U.S. Department of Energy's Office of Energy Efficiency and Renewable Energy published today its final rule on distribution transformer efficiency,
10 CFR Part 431, Energy Conservation Program for Commercial Equipment: Distribution Transformers Energy Conservation Standards; Final Rule.
The final rule sets minimum energy-efficiency standard levels for liquid-immersed distribution transformers and medium-voltage dry-type distribution transformers. The final rule revises efficiency standards previously proposed in DOE's Notice of Proposed Rulemaking (NOPR) published August 4, 2006, and clarifies certain other requirements.
Comparing efficiency levels to those contained in the NOPR, levels for all single-phase transformers and three-phase transformers from 750 kVA through 2500 kVA increased substantially. Levels for three-phase transformers from 15 kVA through 300 kVA remained unchanged, and the level for 500 kVA three-phase units is slightly lower. Howard Industries is studying the final rule to determine the expected impact on the transformer industry.
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