{"data":{"id":"us/30-cfr-57.12028","jurisdiction":"us","citation":"30 CFR 57.12028","heading":"Testing grounding systems.","body":"Continuity and resistance of grounding systems shall be tested immediately after installation, repair, and modification; and annually thereafter. A record of the resistance measured during the most recent test shall be made available on a request by the Secretary or his duly authorized representative.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES","Subpart K—Electricity"],"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":"e841d73aa23354353bd1094ada6224b2a041bfaf0adcdf00ef5fd65033c724fa","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.12027","next":"us/30-cfr-57.12030"},"notice":"GroundRules: Original legal text. Not legal advice."}