Legrand OFRPT3 User Manual
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5
The OFRPT3 and OFRPT4 Poke-Thru Devices have been tested by intertek Testing Services NA, iNC. and have met the
temperature criteria and hose stream requirements of ASTM E119 and UL 263 for 2 hours for Firestop Devices with the
following conditions:
The OFRPT3 and OFRPT4 poke-thru devices are for use with 1, 1-1/2 and 2 hr rated unprotected concrete floors as described
in the D900-Series of concrete floor designs.
The OFRPT3 and OFRPT4 poke-thru stem assembly 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 assemblies are installed as specified:
1. Spacing – Minimum of 2' [610mm] OC and not more than one unit per 65 sq. ft. [6 sq. m] of floor area in each open span.
2. Concrete – Minimum thickness of structural concrete topping of 2 1/4" [57mm] over metal deck or a minimum 3" [76mm]
thick reinforced concrete slab. Unit weight of concrete to be 110 to 155 pcf.
3. installation – Mounted in a 3" [76mm] or 4" [102mm] diameter core-drilled hole in concrete per installation instructions
accompanying the fittings. For use with power circuits, data and/or telephone cables as tabulated below:
OFR POKE-THRU FiTTiNG TyPE
POwER CONDUCTORS (A)
COMMUNiCATiON CONDUCTORs (B)
OFRPT3
16 (.0819 sq in.) [52.851 mm
2
]
128 (9.064 sq in.) [41.290 mm
2
]
OFRPT4
20 (.1024 sq in.) [66.064 mm
2
]
128 (9.064 sq in.) [41.290 mm
2
]
(A) Maximum number of No. 12 AWG Type THHN conductors in power compartment of OFR Poke Thru fitting.
(B) Maximum number of 22 AWG conductors in low-voltage compartment of OFR Poke Thru fitting (4 pair cables have
8 conductors). 128 conductors at 22 AWG is equivalent to 16 wires of Cat 6A type communication cabling. When
conductors larger than No. 22 AWG are used, the aggregate cross-sectional area of the copper conductors shall not
exceed the aggregate cross-sectional area of the 22 AWG conductors permitted in the low-voltage compartment.
COPPER CROSS-SECTiONAL AREA
OF COMMONLy USED CONDUCTORS
Size
Solid
#24
0.00032 sq. in.
[0.20645mm
2
]
#22
0.00050 sq. in.
[0.32258mm
2
]
#14
0.00323 sq. in.
[2.08386mm
2
]
#12
0.00512 sq. in.
[3.30321mm
2
]
#10
0.00815 sq. in.
[5.25805mm
2
]
#8
0.01296 sq. in.
[8.36127mm
2
]
FLOOR COvERiNGS: The OFR poke-thru fittings are fire rated for carpet or wood covered floors, tile floor coverings,
and linoleum floor coverings. For other floor coverings not listed above, consult factory.