Code of Federal Regulations
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30 CFR Mineral Resources
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I Mine Safety and Health ...
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O Coal Mine Safety and He...
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77 Mandatory Safety Stand...
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Subpart J —
Low- and Medium-Voltage Alternating Current Circuits
§77.900 —
Low- and medium-voltage circuits serving portable or mobile three-phase alternating current equipment; circuit breakers
§77.900-1 —
Testing, examination, and maintenance of circuit breakers; procedures
§77.900-2 —
Testing, examination, and maintenance of circuit breakers; record
§77.901 —
Protection of low- and medium-voltage three-phase circuits
§77.901-1 —
Grounding resistor; continuous current rating
§77.902 —
Low- and medium-voltage ground check monitor circuits
§77.902-1 —
Fail safe ground check circuits; maximum voltage
§77.902-2 —
Approved ground check systems not employing pilot check wires
§77.902-3 —
Attachment of ground conductors and ground check wires to equipment frames; use of separate connections
§77.903 —
Disconnecting devices
§77.904 —
Identification of circuit breakers
§77.905 —
Connection of single-phase loads
§77.906 —
Trailing cables supplying power to low-voltage mobile equipment; ground wires and ground check wires