Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 7 - Fire and Smoke Protection Features › Section 713 - PENETRATIONS › Subsection 713.4 - Horizontal assemblies

Current through Register 1525, July 5, 2024
Penetrations of a floor, floor/ceiling assembly or the
				  ceiling membrane of a roof/ceiling assembly not required to be enclosed in a
				  shaft by Section 708.2 shall be protected in accordance with Sections 713.4.1
				  through 713.4.2.2.
713.4.1
Fire-resistance-rated assemblies.
Penetrations of the
				fire-resistance-rated floor, floor/ceiling assembly or the ceiling membrane of
				a roof/ceiling assembly shall comply with Sections 713.4.1.1 through 713.4.1.4.
				Penetrations in horizontal
smoke barriers
shall also comply
				with 713.5.
713.4.1.1
Through
				penetrations.
Through penetrations of fire-resistance-rated
horizontal assemblies
shall comply with Section 713.4.1.1.1 or
				713.4.1.1.2.
Exceptions:
1. Penetrations by steel, ferrous or copper
				conduits, pipes, tubes or vents or concrete or masonry items through a single
				fire-resistance- rated floor assembly where the
annular space
is protected with materials that prevent the passage of flame and hot gases
				sufficient to ignite cotton waste when subjected to ASTM E 119 or UL 263
				time-temperature fire conditions under a minimum positive pressure differential
				of 0.01 inch (2.49 Pa) of water at the location of the penetration for the time
				period equivalent to the
fire-resistance rating
of the
				construction penetrated. Penetrating items with a maximum 6-inch (152 mm)
				nominal diameter shall not be limited to the penetration of a single
				fire-resistance-rated floor assembly, provided the aggregate area of the
				openings through the assembly does not exceed 144 square inches (92 900
				mm2) in any 100 square feet (9.3
				m2) of floor area.
2. Penetrations in a single concrete floor by
				steel, ferrous or copper conduits, pipes, tubes or vents with a maximum 6-inch
				(152 mm) nominal diameter, provided the concrete, grout or mortar is installed
				the full thickness of the floor or the thickness required to maintain the
fire-resistance rating
. The penetrating items shall not be
				limited to the penetration of a single concrete floor, provided the area of the
				opening through each floor does not exceed 144 square inches (92 900
				mm2).
3.
				Penetrations by
listed
electrical boxes of any material,
				provided such boxes have been tested for use in fire-resistance-rated
				assemblies and installed in accordance with the instructions included in the
				listing.
713.4.1.1.1
Installation.
Through penetrations
shall be
				installed as tested in the
approved
fire-resistance-rated
				assembly.
713.4.1.1.2
Through-penetration firestop system.
Through
				penetrations
shall be protected by an
approved
through-penetration firestop system
installed and tested in
				accordance with ASTM E 814 or UL 1479, with a minimum positive pressure
				differential of 0.01 inch of water (2.49 Pa). The system shall have an F
				rating/T rating of not less than 1 hour but not less than the required rating
				of the floor penetrated.
Exception:
Floor penetrations contained and
				  located within the cavity of a wall above the floor or below the floor do not
				  require a T rating.