{"data":{"id":"us/30-cfr-27.37","jurisdiction":"us","citation":"30 CFR 27.37","heading":"Tests to determine adequacy of safety devices for bulbs.","body":"The glass envelope of bulbs with the filament incandescent at normal operating voltage shall be broken in flammable methane-air or natural gas-air mixtures in a gallery to determine that the safety device will prevent ignition of the flammable mixtures.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS","PART 27—METHANE-MONITORING SYSTEMS","Subpart C—Test Requirements"],"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":"09a429825686aea2e5ad60437d3a5f9f3300a2b19db2b332122da9d1f3db4b88","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-27.36","next":"us/30-cfr-27.38"},"notice":"GroundRules: Original legal text. Not legal advice."}