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(C) Mounting in Finished Surfaces. An enclosure
mounted in a finished surface shall be rigidly secured
thereto by clamps, anchors, or fittings identified for
the application.
(D) Suspended Ceilings. An enclosure mounted to
structural or supporting elements of a suspended
ceiling shall be not more than 1650 cm
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 identified 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 Section 300.11(A). The enclosure
shall be secured, using methods identified 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 (Fixtures), or Lampholders. An enclo-
sure that does not contain a device(s) other than
splicing devices or support a luminaire(s) [fixture(s)],
lampholder, or other equipment and is supported by
entering raceways shall not exceed 1650 cm
3
(100
in.
3
) in size. It shall have threaded entries or have
hubs identified for the purpose. It shall be supported
by two or more conduits threaded wrench-tight into
the enclosure or hubs. Each conduit shall be secured
within 900 mm (3 ft.) of the enclosure, or within 450
mm (18 in.) of the enclosure if all conduit entries are
on the same side.
Exception: Rigid metal, intermediate metal, or rigid
nonmetallic conduit or electrical metallic tubing shall be
permitted to support a conduit body of any size, including
a conduit body constructed with only one conduit entry,
provided the trade size of the conduit body is not larger