{"data":{"id":"us/30-cfr-77.902-1","jurisdiction":"us","citation":"30 CFR 77.902-1","heading":"-1 Fail safe ground check circuits; maximum voltage.","body":"The maximum voltage used for ground check circuits under § 77.902 shall not exceed 40 volts.","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":"0588ad65582c9aa4999b865ab7b7d3254ed001feba4bf15005e6915baa42c2dd","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-77.902","next":"us/30-cfr-77.902-2"},"notice":"GroundRules: Original legal text. Not legal advice."}