30 C.F.R. § 57.6404 Separation of blasting circuits from power source.
Title 30 - Mineral Resources
(a) Switches used to connect the power source to a blasting circuit shall be locked in the open position except when closed to fire the blast. (b) Lead wires shall not be connected to the blasting switch until the shot is ready to be fired.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart E—Explosives
Electric Blasting—Surface and Underground
§ 57.6404 Separation of blasting circuits from power source.
