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04/14/2026

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Subpart I—Underground High-Voltage Distribution

RegSense CFR Subpart English CFR Regulations Focus Area USA

§75.800 High-voltage circuits; circuit breakers.

§75.800-1 Circuit breakers; location.

§75.800-2 Approved circuit schemes.

§75.800-3 Testing, examination and maintenance of circuit breakers; procedures.

§75.800-4 Testing, examination and maintenance of circuit breakers; record.

§75.801 Grounding resistors.

§75.802 Protection of high-voltage circuits extending underground.

§75.803 Fail safe ground check circuits on high-voltage resistance grounded systems.

§75.803-1 Maximum voltage ground check circuits.

§75.803-2 Ground check systems not employing pilot check wires; approval by the Secretary.

§75.804 Underground high-voltage cables.

§75.805 Couplers.

§75.806 Connection of single-phase loads.

§75.807 Installation of high-voltage transmission cables.

§75.808 Disconnecting devices.

§75.809 Identification of circuit breakers and disconnecting switches.

§75.810 High-voltage trailing cables; splices.

§75.811 High-voltage underground equipment; grounding.

§75.812 Movement of high-voltage power centers and portable transformers; permit.

§75.812-1 Qualified person.

§75.812-2 High-voltage power centers and transformers; record of examination.

§75.813 High-voltage longwalls; scope.

§75.814 Electrical protection.

§75.815 Disconnect devices.

§75.816 Guarding of cables.

§75.817 Cable handling and support systems.

§75.818 Use of insulated cable handling equipment.

§75.819 Motor-starter enclosures; barriers and interlocks.

§75.820 Electrical work; troubleshooting and testing.

§75.821 Testing, examination and maintenance.

§75.822 Underground high-voltage longwall cables.

§75.823 Scope.

§75.824 Electrical protection.

§75.825 Power centers.

§75.826 High-voltage trailing cables.

§75.827 Guarding of trailing cables.

§75.828 Trailing cable pulling.

§75.829 Tramming continuous mining machines in and out of the mine and from section to section.

§75.830 Splicing and repair of trailing cables.

§75.831 Electrical work; troubleshooting and testing.

§75.832 Frequency of examinations; recordkeeping.

§75.833 Handling high-voltage trailing cables.

§75.834 Training.

Appendix A to Subpart I of Part 75—Diagrams of Inby and Outby Switching

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