547 – Agricultural Buildings

547.5(G) – GFCI Protection in Agricultural Buildings

Change at a Glance:

Revision eliminates GFCI protection for receptacles rated above 125-volt, single-phase, 20-ampere (240-volt and 3-phase receptacles) at agricultural buildings.

547.5 Wiring Methods. (Agricultural Buildings)

(G) Receptacles. All 125-volt, single-phase, 15- and 20-ampere receptacles installed in the locations listed in (1) through (4) shall have Ground-fault circuit-interrupter protection shall be provided as required in 210.8(B). GFCI protection shall not be required for other than 125-volt, 15- and 20-ampere receptacles installed within the following areas:
(1) Areas having an equipotential plane
(2) Outdoors
(3) Damp or wet locations
(4) Dirt confinement areas for livestock

547.9 – Distribution Point Required for Livestock Agricultural Buildings and Structures

Change at a Glance:

Revision provides clarity that a distribution point is required for livestock agricultural buildings and structures. Branch circuits and feeders to agricultural buildings are required to be supplied through a distribution point and overcurrent protection is required for all underground feeder and branch circuit installations.

547.9 Electrical Supply to Building(s) or Structure( s) from a Distribution Point. (Agricultural Buildings)

A distribution point shall be permitted to supply Any agricultural building or structure for livestock located on the same premises shall be supplied from a distribution point. More than one distribution point on the same premises shall be permitted. The overhead electrical supply shall comply with 547.9(A) and (B), or with 547.9(C). The underground electrical supply shall comply with 547.9(C).
Any existing agricultural building or structure for other than livestock and any existing buildings and structures not under the scope of Article 547 shall be permitted to be supplied in accordance with 250.32(B)(1) Exception No. 1.

(A) Site-Isolating Device. (See NEC for complete Code text)

(B) Service Disconnecting Means and Overcurrent Protection at the Building(s) or Structure( s). (See NEC for complete Code text)

(C) Service Disconnecting Means and Overcurrent Protection at the Distribution Point. Where The service disconnecting means and overcurrent protection for each set of feeders or branch circuits are shall be located at the distribution point, the. The service disconnecting means shall be installed in accordance with Part VI of Article 230. The feeders or branch circuits supplied to buildings or structures shall comply with the provisions of 250.32 and Article 225, Parts I and II.
Informational Note: Methods to reduce neutralto- earth voltages in livestock facilities include supplying buildings or structures with 4-wire single- phase services, sizing 3-wire single-phase service and feeder conductors to limit voltage drop to 2 percent, and connecting loads line-to-line.

(D) Identification. Where a site is supplied by more than one distribution point, a permanent plaque or directory shall be installed at each of these distribution points denoting the location of each of the other distribution points and the buildings or structures served by each.