Article 215 contains the requirements for feeders not over 1000 volts ac or 1500 volts dc, nominal. The removal of the medium voltage feeder requirements happened during the 2023 NFPA 70 cycle. The medium voltage requirements can be found in Article 235.
215.3 Overcurrent Protection
215.4 Feeders with Common Neutral Conductor
215.5 Diagrams of Feeders
215.6 Feeder Equipment Grounding Conductor
215.7 Underground Conductors Tapped from Grounded Systems
215.9 Ground-Fault Circuit-Interrupter Protection for Personnel
215.10 Ground-Fault Protection of Equipment
215.11 Circuits Derived from Autotransformers
215.12 Identification for Feeders