MSHA - Code of Federal Regulations - 30 CFR 77.900-2
Skip to content
MSHA - Title 30 CFR
30 CFR § 77.900-2
Testing, examination, and maintenance of circuit breakers; record.

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.