30 CFR Part 56Public Domain
§ 56.6407 — Circuit testing
Subpart E — Explosives
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.
Public Domain: 30 CFR Part 56 (MSHA Safety and Health Standards — Surface Metal and Nonmetal Mines) is a U.S. government publication and is not subject to copyright. Text extracted from the official source ↗. Figures are served from the eCFR; if one does not load, use the link in its place.