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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 56: SAFETY AND HEALTH STANDARDS-SURFACE METAL AND NONMETAL MINES
Subpart E: Explosives
: Electric Blasting
56.6402 - Deenergized circuits near detonators.
Electrical distribution circuits within 50 feet of electric detonators at the blast site shall be deenergized. Such circuits need not be deenergized between 25 to 50 feet of the electric detonators if stray current tests, conducted as frequently as necessary, indicate a maximum stray current of less than 0.05 amperes through a 1-ohm resistor as measured at the blast site.
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