30 C.F.R. § 77.900-2 Testing, examination, and maintenance of circuit breakers; record.
Title 30 - Mineral Resources
The operator 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 and such record shall be kept in a book approved by the Secretary.
Title 30: Mineral Resources
PART 77—MANDATORY SAFETY STANDARDS, SURFACE COAL MINES AND SURFACE WORK AREAS OF UNDERGROUND COAL MINES
Subpart J—Low- and Medium-Voltage Alternating Current Circuits
§ 77.900-2 Testing, examination, and maintenance of circuit breakers; record.
