U.S. Code of Federal Regulations
Regulations most recently checked for updates: Aug 27, 2025
When not in use, power circuits underground shall be deenergized on idle days and idle shifts, except that rectifiers and transformers may remain energized.
Regulations most recently checked for updates: Aug 27, 2025
When not in use, power circuits underground shall be deenergized on idle days and idle shifts, except that rectifiers and transformers may remain energized.