{"data":{"id":"us/30-cfr-7.69","jurisdiction":"us","citation":"30 CFR 7.69","heading":"Approval marking.","body":"Each approved blasting unit shall be identified as permissible by a legible and permanent marking securely attached, stamped, or molded to the outside of the unit. This marking shall include the following:\n(a) The assigned MSHA approval number.\n(b) The maximum blasting circuit resistance.\n(c) A warning that the unit's components must not be disassembled or removed.\n(d) The replacement battery types if the unit has replaceable batteries.\n(e) A warning placed next to the charging connector that the battery only be charged in a fresh air location if rechargeable batteries are used.\n(f) A warning that the unit is compatible only with detonators that will—\n(1) Fire when an average of 1.5 amperes is applied for 5 milliseconds;\n(2) Not misfire when up to an average 100 amperes is applied for 10 milliseconds; and\n(3) Not fire when a current of 250 milliamperes or less is applied.","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 7—TESTING BY APPLICANT OR THIRD PARTY","Subpart D—Multiple-Shot Blasting Units"],"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":"a612d3ab45927a83f6e2146eaf697356c7271d82d86276bf3b5860b192600924","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-7.68","next":"us/30-cfr-7.70"},"notice":"GroundRules: Original legal text. Not legal advice."}