604.1 Scope. The provisions of this article apply to field- installed wiring using off-site manufactured subassemblies for branch circuits, remote-control circuits, signaling circuits, and communications circuits in accessible areas.
604.2 Definition.
Manufactured Wiring System. A system containing component parts that are assembled in the process of manufacture and cannot be inspected at the building site without damage or destruction to the assembly and used for the connection of luminaires, utilization equipment, continuous plug-in type busways, and other devices.
604.3 Other Articles. Except as modified by the require- ments of this article, all other applicable articles of this Code shall apply.
604.4 Uses Permitted. Manufactured wiring systems shall be permitted in accessible and dry locations and in ducts, plenums, and other air-handling spaces where listed for this application and installed in accordance with 300.22.
Exception No. 1: In concealed spaces, one end of tapped cable shall be permitted to extend into hollow walls for direct termination at switch and outlet points.
Exception No. 2: Manufactured wiring system assemblies installed outdoors shall be listed for use in outdoor locations.
604.5 Uses Not Permitted. Manufactured wiring system types shall not be permitted where limited by the applicable article in Chapter 3 for the wiring method used in its construction.
604.6 Construction.
(A) Cable or Conduit Types.
(1) Cables. Cable shall be one of the following: (1) Listed
Type AC cable containing nominal 600-volt, 8 to 12
AWG insulated copper conductors with a bare or
insulated copper equipment grounding conductor
equivalent in size to the ungrounded conductor.
(2) Listed Type MC cable containing nominal 600-volt, 8 to 12 AWG insulated copper conductors with a bare or insulated copper equipment grounding conductor equivalent in size to the ungrounded conductor.
(3) Listed Type MC cable containing nominal 600-volt, 8 to 12 AWG insulated copper conductors with a grounding conductor and armor assembly listed and
identified for grounding in accordance with
250.118(10). The combined metallic sheath and
grounding conductor shall have a current-carrying
capacity equivalent to that of the ungrounded
copper conductor.
Other cables as listed in 725.154, 800.113, 820.113, and 830.179 shall be permitted in manufactured wiring systems for wiring of equipment within the scope of their respective articles.
(2) Conduits. Conduit shall be listed flexible metal conduit or listed liquidtight flexible conduit containing nominal 600-volt, 8 to 12 AWG insulated copper conductors with a bare or insulated copper equipment grounding conductor equivalent in size to the ungrounded conductor.
Exception No. 1 to (1) and (2): A luminaire tap, no longer than 1.8 m (6 ft) and intended for connection to a single luminaire, shall be permitted to contain conductors smaller than 12 AWG but not smaller than
18 AWG. Exception No. 2 to (1) and (2): Listed manufactured wiring assemblies containing conductors smaller than 12 AWG shall be permitted for remote- control, signaling, or communication circuits.
(3) Flexible Cord. Flexible cord suitable for hard usage, with minimum 12 AWG conductors, shall be permitted as part of a listed factory-made assembly not exceeding
1.8 m (6 ft) in length when making a transition between
components of a manufactured