MSHA - Code of Federal Regulations - 30 CFR 57.6407
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MSHA - Title 30 CFR
30 CFR § 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.


[58 FR 69596, Dec. 30, 1993]