MSHA - Code of Federal Regulations - 30 CFR 56.6605
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MSHA - Title 30 CFR
30 CFR § 56.6605
Isolation of blasting circuits.

Lead wires and blasting lines shall be isolated and insulated from power conductors, pipelines, and railroad tracks, and shall be protected from sources of stray or static electricity. Blasting circuits shall be protected from any contact between firing lines and overhead powerlines which could result from the force of a blast.

[58 FR 69596, Dec. 30, 1993]