Underground Low- and Medium-Voltage Alternating Current Circuits

  1. Law
  2. CFR 30
  3. Mineral Resources
  4. Mine Safety and Health Administration, Department of Labor
  5. Coal Mine Safety and Health
  6. Mandatory Safety Standards - Underground Coal Mines
  7. Underground Low- and Medium-Voltage Alternating Current Circuits

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Section
75.900

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

Section
75.900-1

Circuit breakers; location.

Section
75.900-2

Approved circuit schemes.

Section
75.900-3

Testing, examination, and maintenance of circuit breakers; procedures.

Section
75.900-4

Testing, examination, and maintenance of circuit breakers; record.

Section
75.901

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

Appendix
Appendix A to Subpart J of Part 75

Appendix A to Subpart J of Part 75

Section
75.902

Low- and medium-voltage ground check monitor circuits.

Section
75.902-1

Maximum voltage ground check circuits.

Section
75.902-2

Approved ground check systems not employing pilot check wires.

Section
75.902-4

Attachment of ground conductors and ground check wires to equipment frames; use of separate connections.

Section
75.903

Disconnecting devices.

Section
75.904

Identification of circuit breakers.

Section
75.905

Connection of single-phase loads.

Section
75.906

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

Section
75.907

Design of trailing cables for medium-voltage circuits.