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can be used in place of the insulation to achieve a zero
separation without being back to back.
c. Openings around electrical penetrations through fire-
resistive walls, penetrations...shall be fire stopped using
approved methods to maintain the fire-resistive rating.
d. The total surface area of the Carlon boxes in walls
or ceilings on one side of the fire-resistive assembly
cannot exceed 100 square inches for any 100 square
feet of wall or ceiling area.
3. WHAT ABOUT CUBIC INCH CAPACITY OF
CARLON’S BOXES?
For cubic inch capacity of Carlon boxes see Table 7-1 in
this manual; for maximum number of conductors see
NEC Section 314.6, Section 10 in this manual; for FS and
FD boxes, see Carlon’s rigid nonmetallic conduit,
fittings and accessories catalog.
4. WHAT ABOUT THE SUPPORTS OF BOXES?
They shall be rigidly and securely fastened. See NEC
Section 314.23.
Application of Wall Boxes
Carlon series A58 & A52 ENT boxes are listed for use as
switch/outlet boxes, thus they are marked “for use in walls
only.” This marking is dictated by UL.
Contractors have found that the ENT wall boxes have an
application as a junction box in a ceiling area, not used for
environmental air, and where the ENT and the box is not
subject to physical damage, and where the box clearly
cannot be used for a light fixture. Some inspectors have
questioned this use because of the marking on the box.
Since the ENT wall box is a
thicker walled box than the
ENT ceiling box, Carlon supports
the use of the wall box as a
ceiling junction box if the
conditions as stated above
are followed. Inspector approval
should be obtained prior to
installation.
Wall Box Installation.