['Specialized Industries']

['Mining']

04/16/2026

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Specialized Industries - Mining

Subpart J—Underground Low-and Medium-Voltage Alternating Current Circuits

RegSense CFR Subpart Safety & Health CFR Regulations Mining Specialized Industries Mine Safety and Health Administration (MSHA), DOL English Mine Safety Focus Area USA

§75.900 Low- and medium-voltage circuits serving three-phase alternating current equipment; circuit breakers.

§75.900-1 Circuit breakers; location.

§75.900-2 Approved circuit schemes.

§75.900-3 Testing, examination, and maintenance of circuit breakers; procedures.

§75.900-4 Testing, examination, and maintenance of circuit breakers; record.

§75.901 Protection of low- and medium-voltage three-phase circuits used underground.

§75.902 Low- and medium-voltage ground check monitor circuits.

§75.902-1 Maximum voltage ground check circuits.

§75.902-2 Approved ground check systems not employing pilot check wires.

§75.902-4 Attachment of ground conductors and ground check wires to equipment frames; use of separate connections.

§75.903 Disconnecting devices.

§75.904 Identification of circuit breakers.

§75.905 Connection of single-phase loads.

§75.906 Trailing cables for mobile equipment, ground wires, and ground check wires.

§75.907 Design of trailing cables for medium-voltage circuits.

Appendix A to Subpart J of Part 75

['Specialized Industries']

['Mining']

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