{"data":{"id":"us/30-cfr-77.503","jurisdiction":"us","citation":"30 CFR 77.503","heading":"Electric conductors; capacity and insulation.","body":"Electric conductors shall be sufficient in size and have adequate current carrying capacity and be of such construction that a rise in temperature resulting from normal operation will not damage the insulating materials.","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 F—Electrical Equipment—General"],"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":"117fe9d880ea656182d487c787bca366e7cae1227d6a8874e9264c1bc38e51a6","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-77.502-2","next":"us/30-cfr-77.503-1"},"notice":"GroundRules: Original legal text. Not legal advice."}