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, Surface Coal Mines and Surface Work Areas of Underground Coal Mines
  7. Low- and Medium-Voltage Alternating Current Circuits

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Section
77.900

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

Section
77.900-1

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

Section
77.900-2

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

Section
77.901

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

Section
77.901-1

Grounding resistor; continuous current rating.

Section
77.902

Low- and medium-voltage ground check monitor circuits.

Section
77.902-1

Fail safe ground check circuits; maximum voltage.

Section
77.902-2

Approved ground check systems not employing pilot check wires.

Section
77.902-3

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

Section
77.903

Disconnecting devices.

Section
77.904

Identification of circuit breakers.

Section
77.905

Connection of single-phase loads.

Section
77.906

Trailing cables supplying power to low-voltage mobile equipment; ground wires and ground check wires.