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Illustrated Changes to the NEC, 2002 Edition - Part 2

Article 547

Agricultural Buildings

547.5 Wiring Methods

This section was revised to require equipment enclosures, boxes, conduit bodies, and fittings installed in agricultural buildings to comply with the following requirements:

(C) Equipment Enclosures, Boxes, Conduit Bodies, and Fittings.
(1) Excessive Dust.
Equipment enclosures, boxes, conduit bodies, and fittings installed in areas of agricultural buildings where excessive dust may be present must be designed to minimize the entrance of dust and have no openings (such as holes for attachment screws) through which dust could enter the enclosure.

Author’s Comment: Dust ignitionproof enclosures are not required and weatherproof boxes could be used to meet this requirement. Figure 547-2

(2) Damp or Wet Locations. In damp or wet locations of agricultural buildings, equipment enclosures, boxes, conduit bodies, and fittings must be located or equipped to prevent moisture from entering or accumulating within the enclosure, box, conduit body, or fitting. In wet locations of agricultural buildings, including normally dry or damp locations where surfaces are periodically washed or sprayed with water, boxes, conduit bodies, and fittings and must be listed for use in wet locations, and equipment enclosures must be weatherproof.

(3) Corrosive Atmosphere. Where wet dust, excessive moisture, corrosive gases or vapors, or other corrosive conditions may be present in an agricultural building, equipment enclosures, boxes, conduit bodies, and fittings must have corrosion resistant properties suitable for the conditions.
Intent: The new text clarifies that the types of enclosures required in agricultural buildings are dependent upon the conditions where the enclosures are installed.


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