GroundRules
30 CFR 57.6407: Circuit testing.
Where this section sits in the code
- Title 30—Mineral Resources
- CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
- SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH
- PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES
- Subpart E—Explosives
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.
Collected 2026-08-27T02:25:24Z. Source file · JSON