Chapter 3 Wiring Methods and Materials

378.30 ARTICLE 382 - NONMETALLIC EXTENSIONS
378.30 Securing and Supporting. Nonmetallic wireway
shall be supported in accordance with 378.30(A) and (B).
(A) Horizontal Support. Nonmetallic wireways shall be
supported where run horizontally at intervals not to exceed
900 mm (3 ft), and at each end or joint, unless listed for
other support intervals. In no case shall the distance between
supports exceed 3 m (10 ft).
(D) Vertical Support. Vertical runs of nonmetallic wireway
shall be securely supported at intervals not exceeding
1.2 m (4 ft), unless listed for other support intervals, and
shall not have more than one joint between supports. Adjoining
nonmetallic wireway sections shall be securely fastened
together to provide a rigid joint.
378.44 Expansion Fittings. Expansion fittings for nonmetallic
wireway shall be provided to compensate for thermal
expansion and contraction where the length change is expected
to be 6 mm (0.25 in.) or greater in a straight run.
FPN: See Table 352.44 for expansion characteristics of
PVC conduit. The expansion characteristics of PVC nonmetallic
wireway are identical.
378.56 Splices and Taps. Splices and taps shall be permitted
within a nonmetallic wireway, provided they are accessible.
The conductors, including splices and taps, shall not
fill the nonmetallic wireway to more than 75 percent of its
area at that point.
378.58 Dead Ends. Dead ends of nonmetallic wireway
shall be closed using listed fittings.
378.60 Grounding. Where equipment grounding is required,
a separate equipment grounding conductor shall be
installed in the nonmetallk wireway. A separate equipment
grounding conductor shall not be required where the
grounded conductor is used to ground equipment as permitted
in 250.142.
378.70 Extensions from Nonmetallic Wireways. Extensions
from nonmetallic wireway shall be made with cord
pendants or any wiring method of Chapter 3. A separate
equipment grounding conductor shall be installed in, or an
equipment grounding connection shall be made to, any of
the wiring methods used for the extension.
380.1 Scope. This article covers the use and installation
requirements for multioutlet assemblies.
380.2 Use.
(A) Permitted. The use of a multioutlet assembly shall be
permitted in dry locations.
(D) Not Permitted. A multioutlet assembly shall not be
installed as follows:
(1) Where concealed, except that it shall be permissible to
surround the back and sides of a metal multioutlet assembly
by the building finish or recess a nonmetallic
multioutlet assembly in a baseboard
(2) Where subject to severe physical damage
(3) Where the voltage is 300 volts or more between conductors
unless the assembly is of metal having a thickness
of not less than 1.02 mm (0.040 in.)
(4) Where subject to corrosive vapors
(5) In hoistways
(6) In any hazardous (classified) location, except as permitted
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380.3 Metal Multioutlet Assembly Through Dry Partitions.
It shall be permissible to extend a metal multioutlet
assembly through (not run within) dry partitions if arrangements
are made for removing the cap or cover on all exposed
portions and no outlet is located within the partitions.
I. General
382.1 Scope. This article covers the use, installation, and
construction specifications for nonmetallic extensions.
382.2 Definitions.
III. Construction Specifications
378.120 Marking. Nonmetallic wireways shall be marked
so that the manufacturer's name or trademark and interior
cross-sectional area in square inches shall be visible after
installation. Marking for limited smoke shall be permitted
on the nonmetallic wireways that have limited smokeproducing
characteristics.
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