30 CFR 57.6407 - Circuit testing.
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A blasting galvanometer or other instrument designed for testing blasting circuits shall be used to test the following:
(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;
Title 30 published on 2014-07-01.
No entries appear in the Federal Register after this date, for 30 CFR Part 57.