MSHA - Code of Federal Regulations - 30 CFR 75.900-1
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MSHA - Title 30 CFR
30 CFR § 75.900-1
Circuit breakers; location.


Circuit breakers used to protect low-and medium-voltage circuits underground shall be located in areas which are accessible for inspection, examination, and testing, have safe roofs, and are clear of any moving equipment used in haulageways.