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Low-voltage and Medium-voltage Alternating Current

Low-voltage and Medium-voltage Alternating Current

208.271Low-voltage and medium-voltage circuits serving portable or mobile three-phase alternating current equipment; circuit breakers.208.272Testing, examination and maintenance of circuit breakers; procedures.208.273Testing, examination and maintenance of circuit breakers; record.208.274Protection of low-voltage and medium-voltage three-phase circuits.208.275Grounding resistor; continuous current rating.208.276Low-voltage and medium-voltage ground check monitor circuits.208.277Fail safe ground check circuits; maximum voltage.208.278Approved ground check systems not employing pilot check wires.208.279Attachment of ground conductors and ground check wires to equipment frames; use of separate connections.208.280Disconnecting devices.208.281Identification of circuit breakers.208.282Connection of single-phase loads.208.283Trailing cables supplying power to low-voltage mobile equipment; ground wires and ground check wires.