I. General
FPN: Refer to Article 352 for Rigid Polyvinyl Chloride Conduit: Type PVC and Article 355 for Reinforced Ther- mosetting Resin Conduit: Type RTRC.
384.22 Number of Conductors. The number of conduc- tors permitted in strut-type channel raceways shall not exceed the percentage fill using Table 384.22 and applicable cross-sectional area of specific types and sizes of wire given in the tables in Chapter 9.
The derating factors of 310.15(B)(2)(a) shall not apply to conductors installed in strut-type channel
354.1 Scope. This article covers the use, installation, and construction specifications for nonmetallic underground conduit with conductors (NUCC).
354.2 Definition.
of conductors or cables installed in surface metal raceway shall not be greater than the number for which the raceway is designed. Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles.
The derating factors of 310.15(B)(2)(a) shall not
apply to conductors installed in surface metal raceways
where all of the following conditions are met:
(1) The cross-sectional area of the raceway exceeds
FPN: Refer to Article 352 for Rigid Polyvinyl Chloride Conduit: Type PVC, and Article 353 for High Density Polyethylene Conduit: Type HDPE.
that for which the raceway is designed shall be installed in surface nonmetallic raceway.
388.22 Number of Conductors or Cables. The number of conductors or cables installed in surface nonmetallic raceway shall not be greater than the number for which the raceway is designed. Cables shall be permitted to be installed where such use is not prohibited by the respective cable articles.
sembly, metric designator 16 through 27 (trade size
Vi through 1) conduit.
(7) For encasement in concrete where listed for direct
(1) Where subject to physical damage
390.1 Scope. This article covers the use and installation requirements for underfloor raceways.
390.2 Use.
(A) Permitted. The installation of underfloor raceways shall be permitted beneath the surface of concrete or other flooring material or in office occupancies where laid flush with the concrete floor and covered with linoleum or equivalent floor covering.
under the fill.
(4) In any hazardous (classified) location except as permitted by other articles in this Code.
(5) For the support of luminaires or other equipment except conduit bodies no larger than the largest trade size of the tubing.
(6) Where practicable, dissimilar metals in contact any- where in the system shall be avoided to eliminate the possibility of galvanic action.
Table 392.3(A) Wiring Methods
FPN: For further information on cable trays, see ANSI/NEMA-VE 1-1998, Metal Cable Tray Systems; NEMA-VE 2-1996, Metal Cable Tray Installation Guide- lines; and NEMA-FG-1998, Nonmetallic Cable Tray Systems.
