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Illustrated Changes to the NEC, 2005 Edition - Part 2

Article 547

Agricultural Buildings

547.10 Equipotential Planes and Bonding of Equipotential Planes

Section revised to clarify when an equipotential plane is required in livestock buildings. Previous Codes required an equipotential plane where metallic equipment was “likely to become energized.”

The installation and bonding of equipotential planes must comply with (A) and (B).
(A) Where Equipotential Plane is Required. An equipotential plane must be installed in all concrete floor confinement areas of livestock buildings containing metallic equipment accessible to animals that may become energized.
Figure 547-2

Outdoor concrete confinement areas, such as feedlots, must have an equipotential plane around metallic equipment accessible to animals that may become energized.

The equipotential plane must encompass the area around the equipment where the animal stands.


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