MSHA - Code of Federal Regulations - 30 CFR 77.807-1
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MSHA - Title 30 CFR
30 CFR § 77.807-1
High-voltage powerlines; clearances above ground.
High-voltage powerlines located above driveways, haulageways, and railroad tracks shall be installed to provide the minimum vertical clearance specified in National Electrical Safety Code: Provided, however, That in no event shall any high-voltage powerline be installed less than 15 feet above ground.