{"data":{"id":"us/30-cfr-77.900-2","jurisdiction":"us","citation":"30 CFR 77.900-2","heading":"-2 Testing, examination, and maintenance of circuit breakers; record.","body":"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.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER O—COAL MINE SAFETY AND HEALTH","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"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"bd33591d1caee479a35683743014841abc61ce309d64688fc4a9bb6a3cdd1b3b","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-77.900-1","next":"us/30-cfr-77.901"},"notice":"GroundRules: Original legal text. Not legal advice."}