{"data":{"id":"us/30-cfr-77.804","jurisdiction":"us","citation":"30 CFR 77.804","heading":"High-voltage trailing cables; minimum design requirements.","body":"(a) High-voltage trailing cables used in resistance grounded systems shall be equipped with metallic shields around each power conductor with one or more ground conductors having a total cross-sectional area of not less than one-half the power conductor, and with an insulated conductor for the ground continuity check circuit. External ground check conductors may be used if they are not smaller than No. 8 (AWG) and have an insulation rated at least 600 volts.\n(b) All such high-voltage trailing cables shall be adequate for the intended current and voltage. Splices made in such cables shall provide continuity of all components.","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 I—Surface High-Voltage Distribution"],"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":"5bafbf01c0f4621dbef8304f66e27b1f1059fc8a051174644a47e566b6ca29a6","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-77.803-2","next":"us/30-cfr-77.805"},"notice":"GroundRules: Original legal text. Not legal advice."}