{"data":{"id":"us/30-cfr-27.34","jurisdiction":"us","citation":"30 CFR 27.34","heading":"Test for intrinsic safety.","body":"Assemblies, subassemblies, or components that are designed for intrinsic safety shall be tested by introducing into the circuit(s) thereof a circuit-interrupting device which produces an electric spark from the current in the circuit. The circuit-interrupting device shall be placed in a gallery containing various flammable natural gas-air mixtures. To meet the requirements of this test, the spark shall not ignite the flammable mixture. For this test the circuit-interrupting device shall be operated not less than 100 times at 125 percent of the normal operating voltage of the particular circuit.","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":"bc3d69a26194e83712262084a5af9ba7e4e4b2e6b0ba2161d62db4407da06f5a","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-27.33","next":"us/30-cfr-27.35"},"notice":"GroundRules: Original legal text. Not legal advice."}