{"data":{"id":"us/30-cfr-77.311","jurisdiction":"us","citation":"30 CFR 77.311","heading":"Alarm devices.","body":"Thermal dryer systems shall be equipped with both audible and visual alarm devices which are set to operate when safe dryer temperatures are exceeded.","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 D—Thermal Dryers"],"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":"580fb0062237e9d291136ec9bf2d1627eb4401091bed96d1ad6ab48f2d43268d","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-77.310","next":"us/30-cfr-77.312"},"notice":"GroundRules: Original legal text. Not legal advice."}