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Are there any transformers exempt from this legislation?

As defined by DOE 10 CFR 431.192 a Distribution transformer means a transformer that—

  • Has an input voltage of 34.5 kV or less;
  • Has an output voltage of 600 V or less;
  • Is rated for operation at a frequency of 60 Hz; and
  • Has a capacity of 10 kVA to 2500 kVA for liquid-immersed units and 15 kVA to 2500 kVA for dry-type units.

These are the transformers subjected to the DOE 2016 requirements.

Exceptions are defined by the same DOE 10 CFR 431.192.(5):

  • The term “distribution transformer” does not include a transformer that is an:
  1. Autotransformer;
  2. Drive (isolation) transformer;
  3. Grounding transformer;
  4. Machine-tool (control) transformer;
  5. Non-ventilated transformer;
  6. Rectifier transformer;
  7. Regulating transformer;
  8. Sealed transformer;
  9. Special-impedance transformer;
  10. Testing transformer;
  11. Transformer with tap range of 20 percent or more;
  12. Uninterruptible power supply transformer; or
  13. Welding transformer.

Drive (isolation) transformer means a transformer that:

  1. Isolates an electric motor from the line;
  2. Accommodates the added loads of drive-created harmonics; and
  3. Is designed to withstand the additional mechanical stresses resulting from an alternating current adjustable frequency motor drive or a direct current motor drive.

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