A blasting galvanometer or other instrument designed for testing blasting circuits shall be used to test each of the following:
- (a) Continuity of each electric or electronic detonator in the blasthole prior to stemming and connection to the blasting line.
- (b) Resistance of individual series or the resistance of multiple balanced series to be connected in parallel prior to their connection to the blasting line.
- (c) Continuity of blasting lines prior to the connection of electric or electronic detonator series.
- (d) Total blasting circuit resistance prior to connection to the power source.
[61 FR 36795, July 12, 1996, as amended at 85 FR 2027, Jan. 14, 2020]