MSHA - Code of Federal Regulations - 30 CFR 57.12086
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MSHA - Title 30 CFR
30 CFR § 57.12086
Location of trolley wire.


Trolley and trolley feeder wire shall be installed opposite the clearance side of haulageways. However, this standard does not apply where physical limitations would prevent the safe installation or use of such trolley and trolley feeder wire.