Drawing

Order number of pieces required, in multiples of Standard Package Quantity.
K.4
Cable/ConduitBeam/PurlinHangers/Hanging
Systems
Stud WallCommunication/
Low Voltage
Dry WallAcousticalMiscellaneousIndex
Sizing Information
Reference
Codes & Standards
Reference
with metal covers.
2) Cable Tray Systems. The provisions in (a) or (b) shall apply to
the use of metallic cable tray systems in other spaces used for
environmental air (plenums), where accessible, as follows:
(a) Metal Cable Tray Systems. Metal cable tray systems shall be
permitted to support the wiring methods in 300.22 (C)(1).
(b) Solid Side and Bottom Metal Cable Tray Systems.
Solid side and bottom metal cable tray systems with solid metal
covers shall be permitted to enclose wiring methods and cables,
not already covered in 300.22 (C)(1), in accordance with 392.10 (A)
and (B).
(3) Equipment. Electrical equipment with a metal enclosure, or
electrical equipment with a nonmetallic enclosure listed for use
within an air-handling space and having adequate  re-resistant
and low-smoke-producing characteristics, and associated wiring
material suitable for the ambient temperature shall be permitted to
be installed in such other space unless prohibited elsewhere in
this Code.
Informational Note: One method of de ning adequate  re-resistant
and low-smoke producing characteristics for electrical equipment
with a nonmetallic enclosure is in ANSI/UL 2043-2008, Fire Test for
Heat and Visible Smoke Release for Discrete Products and Their
Accessories Installed in Air-Handling Spaces.
Exception: Integral fan systems shall be permitted where
speci cally identi ed for use within an air-handling space.
(D) Information Technology Equipment. Electrical wiring in
air-handling areas beneath raised  oors for information technology
equipment shall be permitted in accordance with Article 645.
310.15 Ampacities for Conductors Rated 0–2000 Volts.
(B) Tables…
(3) Adjustment Factors.
(a) More Than Three Current-Carrying Conductors in a Raceway
or Cable. Where the number of current-carrying conductors in a
raceway or cable exceeds three, or where single conductors or
multiconductor cables are installed without maintaining spacing for
a continuous length longer than 600mm (24 in.) and are not installed
in raceways, the allowable ampacity of each conductor shall be
reduced as shown in Table 310.15 (B)(3)(a). Each current-carrying
conductor of a paralleled set of conductors shall be counted as
a current-carrying conductor.
Where conductors of different systems, as provided in 300.3, are
installed in a common raceway or cable, the adjustment factors
shown in Table 310.15 (B)(3)(a) shall apply only to the number of
power and lighting conductors (Articles 210, 215, 220, and 230).
Informational Note No. 1: See Annex B, Table B.310.15 (B)(2)(11), for
adjustment factors for more than three current-carrying conductors in
a raceway or cable with load diversity.
Informational Note No. 2: See 366.23 (A) for adjustment factors
for conductors in sheet metal auxiliary gutters and 376.22 (B) for
NFPA 70; National Electric Code; 2011 Revision
(continued)