Drawing

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K.5
Cable/Conduit Beam/Purlin Hangers/Hanging
Systems
Stud Wall Communication/
Low Voltage
Dry Wall Acoustical Miscellaneous Index
Sizing Information
Reference
Codes & Standards
Reference
NFPA 70; National Electric Code; 2011 Revision
(continued)
adjustment factors for conductors in metal wireways.
(4) Adjustment factors shall not apply to Type AC cable or to Type
MC cable under the following conditions:
a. The cables do not have an overall outer jacket.
b. Each cable has not more than three current-carrying conductors.
c. The conductors are 12 AWG copper.
d. Not more than 20 current-carrying conductors are installed without
maintaining spacing, are stacked, or are supported on “bridle rings.”
(5) An adjustment factor of 60 percent shall be applied to Type AC
cable or Type MC cable under the following conditions:
a. The cables do not have an overall outer jacket.
b. The number of current carrying conductors exceeds 20.
c. The cables are stacked or bundled longer that 600mm (24 in.)
without spacing being maintained.
314.23 Supports. Enclosures within the scope of this article shall
be supported in accordance with one or more of the provisions in
314.23 (A) through (H).
(C) Mounting in Finished Surfaces. An enclosure mounted in a
 nished surface shall be rigidly secured thereto by clamps, anchors,
or  ttings identi ed for the application.
(D) Suspended Ceilings. An enclosure mounted to structural or
supporting elements of a suspended ceiling shall be not more than
1650cm
3
(100 in.
3
) in size and shall be securely fastened in place in
accordance with either (D)(1) or (D)(2).
(1) Framing Members. An enclosure shall be fastened to the
framing members by mechanical means such as bolts, screws, or
rivets, or by the use of clips or other securing means identi ed for
use with the type of ceiling framing member(s) and enclosure(s)
employed. The framing members shall be adequately supported
and securely fastened to each other and to the building structure.
2) Support Wires. The installation shall comply with the provisions
of 300.11 (A). The enclosure shall be secured, using methods
identi ed for the purpose, to ceiling support wire(s), including
any additional support wire(s) installed for that purpose. Support
wire(s) used for enclosure support shall be fastened at each end
so as to be taut within the ceiling cavity.
(E) Raceway Supported Enclosure, without Devices,
Luminaires, or Lampholders. An enclosure that does not contain
a device(s) other than splicing devices or support a luminaire(s),
lampholder, or other equipment and is supported by entering
raceways shall not exceed 1650cm
3
(100 in.
3
) in size. It shall have
threaded entries or have hubs identi ed for the purpose. It shall be
supported by two or more conduits threaded wrenchtight into the
enclosure or hubs. Each conduit shall be secured within 900mm
(3 ft.) of the enclosure, or within 450mm (18 in.) of the enclosure if
all conduit entries are on the same side.
Exception: The following wiring methods shall be permitted to
support a conduit body of any size, including a conduit body
constructed with only one conduit entry, if the trade size of the