AGRICULTURAL BUILDINGS

70-585 545-9. Boxes. (a) Other Dimensions. Boxes of dimensions other than those required in Table 370-16(a) shall be permitted to be installed when tested, identified, and listed to applicable standards. (b) Not Over 100 Cubic Inches. Any box not over 100 cubic inches in size, intended for mounting in closed construction, shall be affixed with anchors or clamps so as to provide a rigid and secure installation. 545-10. Receptacle or Switch with Integral Enclosure. A receptacle or switch with integral enclosure and mounting means, when tested, identified, and listed to applicable standards, shall be permitted to be installed. 545-11. Bonding and Grounding. Prewired panels and building components shall provide for the bonding, or bonding and grounding, of all exposed metals likely to become energized, in accordance with Article 250, Parts E, F, and G. 545-12. Grounding Electrode Conductor. The grounding electrode conductor shall meet the requirements of Article 250, Part J. Provisions shall be made to route the grounding electrode conductor from the service equipment to the point of attachment to the grounding electrode. 545-13. Component Interconnections. Fittings and connectors that are intended to be concealed at the time of on-site assembly, when tested, identified, and listed to applicable standards, shall be permitted for on-site interconnection of modules or other building components. Such fittings and connectors shall be equal to the wiring method employed in insulation, temperature rise, and fault-current withstand and shall be capable of enduring the vibration and minor relative motions occurring in the components of manufactured building. ARTICLE 547 - AGRICULTURAL BUILDINGS 547-1. Scope. The provisions of this article shall apply to the following agricultural buildings or that part of a building or adjacent area as specified in (a) and (b) below. (a) Excessive Dust and Dust with Water. Agricultural buildings where excessive dust and dust with water may accumulate, including all areas of poultry, livestock, and fish confinement systems, where litter dust, or feed dust, including mineral feed particles, may accumulate, and adjacent areas of similar or like nature. (b) Corrosive Atmosphere. Agricultural buildings where a corrosive atmosphere exists. Such buildings include areas where (1) poultry and animal excrement may cause corrosive vapors; (2) corrosive particles may combine with water; (3) the area is damp and wet by reason of periodic washing for cleaning and sanitizing with water and cleansing agents; (4) similar conditions exist. 70-586 NATIONAL ELECTRICAL CODE 547-2. Other Articles. For agricultural buildings not having conditions as specified in Section 547-1, the electrical installations shall be made in accordance with the applicable articles in this Code. 547-3. Surface Temperatures. Electrical equipment or devices installed in accordance with the provisions of this article shall be installed in a manner such that they will function at full rating without developing surface temperatures in excess of the specified normal safe operating range of the equipment or device. 547-4. Wiring Methods. In agricultural buildings as described in Sections 547-1(a) and (b), Types UF, NMC, SNM, copper SE, or other cables or raceways suitable for the location, with approved termination fittings, shall be the wiring methods employed. Article 320 and Article 502 wiring methods shall be permitted for Section 547-1(a). Article 347 and Article 351, Part B wiring methods shall be permitted. All cables shall be secured within 8 inches (203 mm) of each cabinet, box, or fitting. The 1/4-inch (6.35-mm) air space required for nonmetallic boxes, fittings, conduit, and cables in Section 300-6(c) shall not be required in buildings covered by this article. (FPN): See Sections 300-7 and 347-9 for installation of raceway systems exposed to widely different temperatures. (a) Boxes, Fittings, and Wiring Devices. All boxes and fittings shall comply with Section 547-5. (b) Flexible Connections. Where necessary to employ flexible connections, dusttight flexible connectors, liquidtight flexible conduit, or flexible cord listed and identified for hard usage shall be used. All shall be used with listed and identified fittings. 547-5. Switches, Circuit Breakers, Controllers, and Fuses. Switches, circuit breakers, controllers, and fuses, including pushbuttons, relays, and similar devices, used in buildings described in Sections 547-1(a) and (b), shall be provided with enclosures as specified in (a) and (b) below. (a) Excessive Dust and Dust with Water. Buildings described in Section 547-1(a) shall utilize dustproof and weatherproof enclosures. (b) Corrosive Atmosphere. Buildings described in Section 547-1(b) shall utilize watertight, corrosion-resistant enclosures. (FPN): Cast aluminum and magnetic steels will corrode in agricultural environments. 547-6. Motors. Motors and other rotating electrical machinery shall be totally enclosed or so designed as to minimize the entrance of dust, moisture, or corrosive particles. 547-7. Lighting Fixtures. Lighting fixtures installed in agricultural buildings described in Section 547-1 shall comply with the following: (a) Minimize the Entrance of Dust. Lighting fixtures shall be installed to minimize the entrance of dust, foreign matter, moisture, and corrosive material. ARTICLE 547 - AGRICULTURAL BUILDINGS 70-587 (b) Exposed to Physical Damage. Any lighting fixture that may be exposed to physical damage shall be protected by a suitable guard. (c) Exposed to Water. A fixture that may be exposed to water from condensation, building cleansing water, or solution shall be watertight. 547-8. Grounding, Bonding, and Equipotential Plane. (a) Grounding and Bonding. Grounding and bonding shall comply with