§ 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 or electronic 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 or electronic detonators.