single-phase service and feeder conductors to limit voltage drop to 2 percent, and connecting loads line-to-line.

(D) Direct-Buried Equipment Grounding Conductors. Where livestock is housed, any portion of a direct-buried equipment grounding conductor run to the building or structure shall be insulated or covered copper.

(E) Identification. Where a site is supplied by more than

one service with any two services located a distance of

150 m (500 ft) or less apart, as measured in a straight

line, 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.

547.10 Equipotential Planes and Bonding of Equipoten-tial Planes. The installation and bonding of equipotential planes shall comply with 547.10(A) and (B). For the purposes of this section, the term livestock shall not include poultry.

(A) Where Required. Equipotential planes shall be in stalled where required in (A)(1) and (A)(2).

(1) Indoors. Equipotential planes shall be installed in confinement areas with concrete floors where metallic equipment is located that may become energized and is accessible to livestock.

(2) Outdoors. Equipotential planes shall be installed in

concrete slabs where metallic equipment is located that

may become energized and is accessible to livestock.

The equipotential plane shall encompass the area where the livestock stands while accessing metallic equipment that may become energized.

(B) Bonding. Equipotential planes shall be connected to the electrical grounding system. The bonding conductor shall be copper, insulated, covered or bare, and not smaller than 8 AWG. The means of bonding to wire mesh or conductive elements shall be by pressure connectors or clamps of brass, copper, copper alloy, or an equally substantial approved means. Slatted floors that are supported by structures that are a part of an equipotential plane shall not require bonding.

FPN No. 1: Methods to establish equipotential planes are described in American Society of Agricultural and Biological Engineers (ASABE) EP473.2-2001, Equipotential Planes in Animal Containment Areas.
FPN No. 2: Methods for safe installation of livestock wa- terers are described in American Society of Agricultural and Biological Engineers (ASABE) EP342.2-
1995, Safety for Electrically Heated Livestock Waterers.
FPN No. 3: Low grounding electrode system resistances may reduce potential differences in livestock facilities.