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Title 30: Mineral Resources
CHAPTER I: MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
SUBCHAPTER K: METAL AND NONMETAL MINE SAFETY AND HEALTH
PART 57: SAFETY AND HEALTH STANDARDS-UNDERGROUND METAL AND NONMETAL MINES
Subpart E: Explosives
: Extraneous Electricity-Surface and Underground
57.6603 - Air gap.
At least a 15-foot air gap shall be provided between the blasting circuit and the electric power source.
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