30 CFR 57.6402 - Deenergized circuits near detonators.

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§ 57.6402 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 ampere through a 1-ohm resistor as measured at the blast site.

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United States Code

Title 30 published on 2015-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 30 CFR Part 57 after this date.

  • 2015-09-02; vol. 80 # 170 - Wednesday, September 2, 2015
    1. 80 FR 52984 - MSHA Headquarters, Pittsburgh Safety and Health Technology Center, and Respirable Dust Processing Laboratory Address Changes
      GPO FDSys XML | Text
      DEPARTMENT OF LABOR, Mine Safety and Health Administration
      Final rule; technical amendment.
      Effective Date: September 2, 2015.
      30 CFR Parts 7, 18, 44, 46, 48, 49, 56, 57, 70, 71, 72, 74, 75, and 90