# Energy Conservation Program: Test Procedure for Distribution Transformers
> **US Department of Energy** · Final rule. · Published 2021-09-14 · Effective 2021-10-14 · 86 FR 51230
## Document
- **Document number:** 2021-19366
- **Category:** other
- **Sub-agency:** US Department of Energy
- **Federal Register citation:** 86 FR 51230
- **CFR reference:** 10 CFR 431
- **Publication date:** 2021-09-14
- **Effective date:** 2021-10-14
- **Energy docket:** EERE-2017-BT-TP-0055
## Abstract

The U.S. Department of Energy ("DOE") is amending the test procedure for distribution transformers to revise and add definitions of certain terms, update provisions based on the latest versions of relevant industry testing standards, and to specify the basis for voluntary representations at additional per-unit loads and additional reference temperatures. The updates in this final rule will not significantly change the test procedure.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2021/09/14/2021-19366/energy-conservation-program-test-procedure-for-distribution-transformers)
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