21.107: ELECTRICAL CODE ADOPTED:
The 2020 edition of the National Electrical Code and appendices, promulgated by the National Fire Protection Association, is hereby adopted in its entirety, except such portions thereof as may be expressly deleted, modified or amended by this section.
   A.   While the 2020 National Electrical Code and all appendices have hereinabove been adopted, the following exceptions thereto (consisting of certain deletions and changes) shall control wherever such exceptions are applicable or are in conflict with certain other provisions of that code:
      1.   Aluminum wire is strictly prohibited inside the structure. All conductors shall be of solid or stranded copper on the interior of the structure.
      2.   In new work, where bracket boxes and recessed fixtures must be used, brackets must be screwed, not nailed, unless space limitations make it impractical.
      3.   All lay-in fixtures in grid ceilings must have at least two (2) independent hanger rods attached to fixtures at opposite corners.
      4.   Boxes in dropped ceilings must be supported with threaded rod, hanger rod, or listed bracket hangers.
      5.   All receptacles, including GFCI outlets, shall be of the self-grounding type or be grounded to the box by means of ground wire attached to the threaded hole in the box with a machine screw only.
      6.   Electrical services:
         a.   In all cases where a circuit breaker panel would be mounted to a concrete foundation wall, it shall be mounted to plywood, or equivalent, so direct contact to below grade concrete will not cause the metal enclosure to rust. All rigid metal conduit related to services shall be mounted with clamp backs and straps, or equivalent. Minnies are not acceptable.
         b.   Ground bushings or locknuts shall be used in both meter fittings and circuit breaker panels with no exceptions.
         c.   When installing temporary wiring for an underground service, it must be routed through the bottom of the meter pedestal so access for inspection is possible.
         d.   In commercial applications, all circuit breaker panels over two hundred (200) amp or larger shall be bolt-in type breakers only.
         e.   The following materials referenced in the national electrical code are hereby prohibited unless specifically approved by the code official.
Integrated gas space cable, mineral-insulated, metal- sheathed cable, nonmetallic-sheathed cable, service-entrance cable, nonmetallic underground conduit with connectors, liquidtight flexible nonmetallic conduit, flexible nonmetallic tubing, electrical nonmetallic tubing, nonmetallic wireways, nonmetallic extensions, surface nonmetallic raceways, concealed knob and tube, messenger supported wiring, and open wiring on insulators.
         f.   All ceiling boxes in habitable areas of residential buildings shall be listed and approved for ceiling fan installations.
         g.   Aluminum or copper-clad aluminum service entrance conductors are allowed according to the National Electric Code. All aluminum and copper-clad aluminum service entrance conductors must be installed by a qualified electrician in accordance with manufacturer's torque specifications and be regularly inspected by the a qualified electrician. The electric service panel and meter socket must specifically be labeled and listed for aluminum and copper-clad aluminum service entrance conductors.
         h.   All branch circuit conductors shall be connected to devices such as switches and receptacles by the means of the screw terminals provided on these devices.
         i.   The following residential appliances shall be supplied with a dedicated branch circuit.
            (1)   Furnace/heating plant/central air units.
            (2)   Through-wall heating/air conditioning units.
            (3)   Built-in microwave ovens.
            (4)   Sump and ejector pumps.
         j.   An approved grounding electrode, eight feet (8') in length minimum and one-half inch (1/2") diameter shall be installed at each parking lot/street lighting pole.
         k.   An in-line fuse holder shall be installed in each parking lot/street lighting pole. The fuse holder shall be located in an approved hand hole.
   B.   In addition to and in supplement of the 2020 edition of the National Electric Code and the various changes thereof adopted by this section, there is hereby adopted Sections 210.52(G)(1)(a)(1) and 210.52(G)(1)(a)(2) of the 2020 National Electric Code, as outlined in Section 21.230 of this Code.
(Ord. 6303, 2-21-2017; amd. Ord. 6607, 2-15-2022; Ord. 6682, 6-20-2023)