30 CFR 57.6407 - Circuit testing.

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§ 57.6407 Circuit testing.

A blasting galvanometer or other instrument designed for testing blasting circuits shall be used to test the following:

(a) In surface operations -

(1) Continuity of each electric detonator in the blasthole prior to stemming and connection to the blasting line;

(2) Resistance of individual series or the resistance of multiple balanced series to be connected in parallel prior to their connection to the blasting line;

(3) Continuity of blasting lines prior to the connection of electric detonator series; and

(4) Total blasting circuit resistance prior to connection to the power source.

(b) In underground operations -

(1) Continuity of each electric detonator series; and

(2) Continuity of blasting lines prior to the connection of electric detonators.

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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