MSHA - Code of Federal Regulations - 30 CFR 57.12081
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MSHA - Title 30 CFR
30 CFR § 57.12081
Bonding metal pipelines to ground return circuits.
All metal pipelines, 1,000 feet or more in length running parallel to trolley tracks, that are used as a ground return circuit shall be bonded to the return circuit rail at the ends of the pipeline and at intervals not to exceed 500 feet.