30 C.F.R. § 57.6407 Circuit testing.
Title 30 - Mineral Resources
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.
Title 30: Mineral Resources
PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
Subpart E—Explosives
Electric Blasting—Surface and Underground
§ 57.6407 Circuit testing.
