SECTION 712 PENETRATIONS
712.4.1.2 Membrane penetrations.
Penetrations of membranes that are part of a fire resistance
rated horizontal assembly shall comply with Section
712.4.1.1.1 or 712.4.1.1.2.
Where floor/ceiling assemblies are required to have a minimum
1 hour fire resistance rating, recessed fixtures shall be
installed such that the required fire resistance will not
be reduced.
Exceptions:
1.
Membrane penetrations of maximum 2-hour fire-resistance-rated
walls and partitions by steel, ferrous or copper conduits,
pipes, tubes or vents, or concrete or masonry items where
the annular space is protected either in accordance with
Section 712.4.1.1 or to prevent
the free passage of flame and the products of combustion.
The aggregate area of the openings through the membrane
shall not exceed 100 square inches (64 500 mm2)
in any 100 square feet (9.3 m2) of ceiling area
in assemblies tested without penetrations.
2.
Ceiling membrane penetrations of maximum 2-hour fire-resistance-rated
horizontal assemblies by steel electrical boxes that do
not exceed 16 square inches (l0 323 mm2) in area,
provided the aggregate area of such penetrations does not
exceed 100 square inches (44 500 mm2) in any
100 square feet (9.29 m2) of ceiling area, and
the annular space between the ceiling membrane and the box
does not exceed 1/8 inch (3.12 mm).
3. Membrane penetrations by listed electrical boxes
of any material, provided such boxes have been tested for
use in fire-resistance-rated assemblies and are installed
in accordance with the instructions included in the listing.
The annular space between the ceiling membrane and
the box shall not exceed 1/8 inch
(3.1 mm) unless listed otherwise.
4.The annular space created
by the penetration of a fire sprinkler, provided it is covered
by a metal escutcheon plate.
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