30 C.F.R. § 56.6603 Air gap.
Title 30 - Mineral Resources
At least a 15-foot air gap shall be provided between the blasting circuit and the electric power source.
Title 30: Mineral Resources
PART 56—SAFETY AND HEALTH STANDARDS—SURFACE METAL AND NONMETAL MINES
Subpart E—Explosives
Extraneous Electricity
§ 56.6603 Air gap.
