§57.6407. Circuit testing.
30 C.F.R. § 57.6407
A blasting galvanometer or other instrument designed for testing blasting circuits shall be used to test the following:
In surface operations—
Continuity of each electric detonator in the blasthole prior to stemming and connection to the blasting line;
Resistance of individual series or the resistance of multiple balanced series to be connected in parallel prior to their connection to the blasting line;
Continuity of blasting lines prior to the connection of electric or electronic detonator series; and
Total blasting circuit resistance prior to connection to the power source.
In underground operations—
Continuity of each electric detonator series; and
Continuity of blasting lines prior to the connection of electric or electronic detonators.
Notes, amendments, and revision history
Amendments
[61 FR 36801, July 12, 1996, as amended at 85 FR 2027, Jan. 14, 2020]
Source
Source: 61 FR 36801, July 12, 1996, unless otherwise noted.
Authority
Authority: 30 U.S.C. 811.
Source
Source: 50 FR 4082, Jan. 29, 1985, unless otherwise noted.
Amendments
[61 FR 36801, July 12, 1996, as amended at 85 FR 2027, Jan. 14, 2020]