354-Nonmetallic Underground Conduit with
I. General
354.1 Scope. This article covers the use, installation, and construction specifications for nonmetallic underground conduit with conductors (NUCC).
354.2 Definition.
National Electric Code
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386-Surface Metal Raceways
I. General
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
355-Reinforced Thermosetting Resin
I. General
355.1 Scope. This article covers the use, installation, and construction specification for reinforced thermosetting resin conduit (RTRC) and associated fittings.
FPN: Refer to Article 352 for Rigid Polyvinyl Chloride Conduit: Type PVC, and Article 353 for High Density Polyethylene Conduit: Type HDPE.
388-Surface Nonmetallic Raceways
I. General
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.
356-Liquidtight Flexible Nonmetallic
I. General
sembly, metric designator 16 through 27 (trade size
Vi through 1) conduit.
(7) For encasement in concrete where listed for direct
burial and installed in compliance with 356.42.
356.12 Uses Not Permitted. LFNC shall not be used as follows:
(1) Where subject to physical damage
390-Underfloor Raceways
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.
358-Electrical Metallic Ihbing
I. General
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.
392-Cable Trays
Table 392.3(A) Wiring Methods
392.1 Scope. This article covers cable tray systems, in cluding ladder, ventilated trough, ventilated channel, solid bottom, and other similar structures.
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-Flexible Metallic Tubing
I. General
360.1 Scope. This article covers the use, installation, and construction specifications for flexible metallic tubing (FMT) and associated fittings.
360.2 Definition.
394-Concealed Knob-and-Tube Wiring
I. General
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.
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