{"data":{"id":"us/30-cfr-57.4502","jurisdiction":"us","citation":"30 CFR 57.4502","heading":"Battery-charging stations.","body":"(a) Battery-charging stations shall be ventilated with a sufficient volume of air to prevent the accumulation of hydrogen gas.\n(b) Smoking, use of open flames, or other activities that could create an ignition source shall be prohibited at the battery charging station during battery charging.\n(c) Readily visible signs prohibiting smoking or open flames shall be posted at battery-charging stations during battery charging.","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 C—Fire Prevention and Control"],"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":"d0a1970b2b3e597a71fbf1b69a26bec1f53fb16d695fe0f6ca23e64d97f1f295","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.4501","next":"us/30-cfr-57.4503"},"notice":"GroundRules: Original legal text. Not legal advice."}