30 CFR §75.900-4
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
The operator of any coal mine shall maintain a written record of each test, examination, repair, or adjustment of all circuit breakers protecting low- and medium-voltage circuits serving three-phase alternating current equipment used in the mine. Such record shall be kept in a book approved by the Secretary.