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.
360.1 Scope. This article covers the use, installation, and construction specifications for flexible metallic tubing (FMT) and associated fittings.
360.2 Definition.
limited to provide these minimum clearances, such as at meters, panelboards, outlets, and switch points, the individual conductors shall be enclosed in flexible nonmetallic tubing, which shall be continuous in length between the last support and the enclosure or terminal point.
(C) Clearance from Piping, Exposed Conductors, and So Forth. Conductors shall comply with 398.19 for clearances from other exposed conductors, piping, and so forth.
additional protection is provided
332.1 Scope. This article covers the use, installation, and construction specifications for mineral-insulated, metal-sheathed cable, Type MI.
332.2 Definition.
the Installation of Sprinkler Systems, on all floors, ENT shall be permitted to be used within walls, floors, and ceilings, exposed or concealed, in buildings exceeding three floors abovegrade.
FPN: A finish rating is established for assemblies containing combustible (wood) supports. The finish rating is defined as the time at which the wood stud or wood joist reaches an average temperature rise of
121°C (250°F) or an individual temperature of 163°C
(325°F) as measured on the plane of the wood nearest
