30 C.F.R. § 7.69 Approval marking.
Title 30 - Mineral Resources
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: (a) The assigned MSHA approval number. (b) The maximum blasting circuit resistance. (c) A warning that the unit's components must not be disassembled or removed. (d) The replacement battery types if the unit has replaceable batteries. (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. (f) A warning that the unit is compatible only with detonators that will— (1) Fire when an average of 1.5 amperes is applied for 5 milliseconds; (2) Not misfire when up to an average 100 amperes is applied for 10 milliseconds; and (3) Not fire when a current of 250 milliamperes or less is applied.
Title 30: Mineral Resources
PART 7—TESTING BY APPLICANT OR THIRD PARTY
Subpart D—Multiple-Shot Blasting Units
§ 7.69 Approval marking.
