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]
