FEEDERS

70-49 (FPN No. 1): See Examples 1 through 10 in Chapter 9. (FPN No. 2): Conductors for feeders as defined in Article 100, sized to prevent a voltage drop exceeding 3 percent at the farthest outlet of power, heating, and lighting loads, or combinations of such loads, and where the maximum total voltage drop on both feeders and branch circuits to the farthest outlet does not exceed 5 percent, will provide reasonable efficiency of operation. (FPN No. 3): See Section 210-19(a) for voltage drop for branch circuits. 215-3. Overcurrent Protection. Feeders shall be protected against overcurrent in accordance with the provisions of Part A of Article 240. 215-4. Feeders with Common Neutral. (a) Feeders with Common Neutral. Feeders containing a common neutral shall be permitted to supply two or three sets of 3-wire feeders, or two sets of 4-wire or 5-wire feeders. (b) In Metal Raceway or Enclosure. Where installed in a metal raceway or other metal enclosure, all conductors of all feeders using a common neutral shall be enclosed within the same raceway or other enclosure as required in Section 300-20. 215-5. Diagrams of Feeders. If required by the authority having jurisdiction, a diagram showing feeder details shall be provided prior to the installation of the feeders. Such a diagram shall show the area in square feet of the building or other structure supplied by each feeder, the total connected load before applying demand factors, the demand factors used, the computed load after applying demand factors, and the size and type of conductors to be used. 215-6. Feeder Conductor Grounding Means. Where a feeder supplies branch circuits in which equipment grounding conductors are required, the feeder shall include or provide a grounding means in accordance with the provisions of Section 250-57 to which the equipment grounding conductors of the branch circuits shall be connected. 215-7. Ungrounded Conductors Tapped from Grounded Systems. Twowire dc circuits and ac circuits of two or more ungrounded conductors shall be permitted to be tapped from the ungrounded conductors of circuits having a grounded neutral conductor. Switching devices in each tapped circuit shall have a pole in each ungrounded conductor. 215-8. Means of Identifying Conductor with the Higher Voltage to Ground. On a 4-wire, delta-connected secondary where the midpoint of one phase is grounded to supply lighting and similar loads, the phase conductor having the higher voltage to ground shall be identified by an outer finish that is orange in color or by tagging or other effective means. Such identification shall be placed at each point where a connection is made if the grounded conductor is also present. 215-9. Ground-Fault Protection for Personnel. Feeders supplying 15- and 20-ampere receptacle branch circuits shall be permitted to be protected 70-50 NATIONAL ELECTRICAL CODE by a ground-fault circuit-interrupter in lieu of the provisions for such interrupters as specified in Section 210-8 and Article 305. 215-10. Ground-Fault Protection of Equipment. Ground-fault protection of equipment as specified by Section 230-95 shall be provided for a feeder disconnect rated 1000 amperes or more in a solidly grounded wye system with greater than 150 volts to ground, but not exceeding 600 volts phaseto-phase. Exception: Feeder ground-fault protection of equipment shall not be required where ground-fault protection of equipment is provided on the supply side of the feeder.