North Dakota Administrative Code › Title 24.1 - State Electrical Board › Article 24.1-06 - ELECTRICAL WIRING STANDARDS › Chapter 24.1-06-03 - WIRING METHODS AND MATERIALS › Section 24.1-06-03-01 - (NEC 300) Wiring methods

Current through Supplement No. 393, July, 2024
1. Agricultural
				buildings. This section covers all buildings housing livestock, poultry, and
				other areas of similar or like nature. All electrical panel boards, wiring
				devices, and equipment shall be installed in accordance with the provisions of
				article 547, 2023 edition, National Electrical Code (first version, printed in
				2022).
A site-isolating device shall be permitted to be installed at
				  the distribution point where two or more agricultural building structures are
				  supplied from the distribution point.
2. Electric metallic tubing shall not be used
				in concrete below grade, in concrete slab or masonry in direct contact with
				earth. A vapor barrier, if used, will have no effect on the requirements of the
				section. Electric metallic tubing shall not be embedded in earth or
				fill.
3. Aluminum conduit shall not
				be installed in contact with earth or embedded in concrete.
4. The installation of rigid nonmetallic
				conduit shall comply with the provision of article 352, 2023 edition, National
				Electrical Code (first version, printed in 2022). Expansion fittings for rigid
				nonmetallic conduit shall be provided to compensate for thermal expansion and
				contraction in accordance with article 352.44, 2023 edition, National
				Electrical Code (first version, printed in 2022). When installed outdoors and
				above grade, one hundred forty degrees Fahrenheit [60 degrees Celsius] shall be
				considered the minimum change in degrees.
5. Fertilizer rooms, meatpacking plants, salt
				processing plants, and similar locations are judged to be occupancies where
				severe corrosive conditions are likely to be present. It is recommended that
				nonmetallic conduit with nonmetallic boxes and fittings be used as the wiring
				method for such occupancies. Ferrous and nonferrous metal raceways shall be
				used providing the raceway, boxes, and fittings are properly protected against
				corrosion.
6. Metal raceways or
				metal clad cable (type MC) rated for the environment shall be installed in the
				following occupancies:
a. Hospitals;
b. Nursing homes;
c. Related patient care areas; and
d. Places of assembly.
Metal raceways or metal clad cable (type MC) shall be used in
				  fixed wiring methods including fire alarms along with metal boxes or
				  nonmetallic raceways encased in not less than two inches of concrete.
Exception 1: As provided in article 640, 2023 edition,
				  National Electrical Code (first version, printed in 2022), sound reproduction
				  and similar equipment; in article 800, 2023 edition, National Electrical Code
				  (first version, printed in 2022), communication circuits; and in article 725,
				  2023 edition, National Electrical Code (first version, printed in 2022), for
				  class 2 and class 3 remote control and signaling circuits.
Exception 2: Listed two-hour fire-rated cables as permitted
				  in article 695.6, and article 760, 2023 edition, National Electrical Code
				  (first version, printed in 2022).
Adjacent areas separated by an approved fire barrier may be
				  wired in any approved wiring method in chapter 3 of the 2023 edition, National
				  Electrical Code (first version, printed in 2022). For the purpose of this
				  section, a fire barrier is defined as a continuous assembly, vertical or
				  horizontal, in accordance with locally adopted codes or the State Building
				  Code.