Cut Sheet
4
Poke-Thru Device Specifications
NOTE: Use above values for solid or stranded conductors.
Size Solid
#24 .00032 sq. in. [.206mm
2
]
#23 .00040 sq. in. [.258mm
2
]
#22 .00050 sq. in. [.322mm
2
]
#14 .00323 sq. in. [2.083mm
2
]
#12 .00512 sq. in. [3.303mm
2
]
#10 .00815 sq. in. [5.258mm
2
]
# 8 .01296 sq. in. [8.361mm
2
]
Copper Cross Sectional Area
of Commonly Used Conductors
Copper Cross Section:
The copper cross-sectional area determines the amount
of wire fill capacity in a poke-thru device. Unlike other
wire and cable management systems that utilize wire
fill capacity, a poke-thru device is UL tested under fire
conditions to determine the maximum amount of copper
conductors that will pass through a poke-thru device,
while maintaining the fire-rating of the floor assembly. All
Walker Flush Style Devices are UL Classified to U.S. and
Canadian safety standards.
Concrete Thickness Min/Max:
1-HOUR RATED FLOOR – 2 1/4" [57mm] min over
top of deck (or 3" [76mm] thick reinforced
concrete slab) to a maximum of
7 1/2" [191mm].
2-HOUR RATED FLOOR – 3 1/4" [83mm] min over
top of deck (or 4" [102mm] thick reinforced
concrete slab) to a maximum of
7 1/2" [191mm].
Floor Coverings:
The poke-thru device is fire rated for carpet and
wood covered concrete floors, and tile floor coverings
1/8" to 3/4" [3.2mm to 19.1mm] thickness. For floor
coverings not listed above, consult factory.
COM50 1/2" Trade
Size Conduit
Connections
(Sold Separately)
Intumescent
Material
3/4" Trade Size
EMT Conduit
Trim Flange for
Carpet or Tile
Concrete Slab
Junction Box
24.5 cu in. [401ml]
Scrub Water
Gasket
Retaining Flange
CAUTION: These devices are suitable for 1, 1 1/2, and 2 hour
rated floor assemblies as described in the UL Fire
Resistance directory for each service.
These devices meet all UL scrub water requirements,
but are not suitable for wet or damp locations, or
other areas subject to saturation with water or other
liquids such as commercial kitchens.
Poke-Thru Devices and abandonment fitting are for use with 1-, 1 1/2-, or 2-hour rated unprotecteed reinforced
concrete floor and 1-, 1 1/2- or 2-hour rated floors employing unprotected steel floor units and concrete topping
(D900-Series Designs), or concrete floors with suspended ceilings. (Fire resistive designs with suspended
ceilings should have provisions for accessibility in the ceiling area below the Poke-Thru Fittings).
The assembled Poke-Thru stem and service fitting or the abandonment fittings will not reduce the ratings of the
floor assembly when the thickness and type of concrete (required for the specific rating) are within the specified
limits and the fittings are installed as specified:
1. Spacing – Minimum of 2' [610mm] OC and not more than one unit per 65 square feet [6 square
meters] of floor area in each span.
2. Concrete – Minimum thickness of structural concrete topping of 2 1/4" [57mm] over metal deck or a
minimum 3" thick reinforced concrete slab. Unit weight of concrete to be 110 to 155 pcf.
3. Installation – Mounted in a 4" [102mm] diameter core drilled hole in concrete per installation instructions
accompanying the fittings or abandonment fittings. For use with power circuits, data and/
or telephone cables as tabulated below.
NOTE: The material that is used in Wiremold
®
Poke-Thru devices is not listed under the directory for Fire Stopping Material
because the poke-thru device is UL Classified as “Outlet Boxes and Fittings Classified For Fire Resistance (CEYY)”.
The pass/fail criteria comes from UL263. The pass criteria is that the poke-thru unit cannot exceed 325° F. above
ambient before the concrete slab (or deck) reaches this same temperature. Some poke-thru devices are tested for 2
hours while others are tested for 4 hours. The intumescent material has never been tested as a fire-stopping material
as a stand-alone device. This material is designed to work as a unit with the entire poke-thru device.