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]