Legrand RC7AFFTC - Manual (Page 3)

The RC7FFTC Series Poke-Thru Device is UL Listed and Classified to U.S. and Canadian safety standards to the
following conditions:
The RC7STC Poke-Thru Stem with the RC7CFFTC Service Head Fitting, and the RC7AFFTC factory assembled poke-thru device,
are for use with 1-, 1 1/2-, or 2-hour rated unprotected reinforced concrete floors 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 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 sq. ft. [6 sq. m] 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" [76mm]
thick reinforced concrete slab. Unit weight of concrete to be 110 to 155 pcf.
3. Installation – Mounted in a 3" diameter core-drilled hole in concrete per installation instructions accompanying the fittings or
abandonment fittings. For use with power circuits, data and/or maximum 25-pair size telephone cables as tabulated below:
The “TC” suffix letters indicate that device may be installed on tile or carpet covered concrete floors. The “LJB”
suffix letters indicate units supplied without a junction box.
(A) Maximum number of No. 12 AWG Type THHN conductors plus maximum number of No. 10 AWG type THHN conductors
in power compartment of poke-thru fitting.
(B) Maximum number of 22 AWG conductors in low voltage compartment of poke-thru fitting (4-pair cables have (8) conductors,
25-pair cables have (50) conductors). 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.
For use on carpet covered and tile floors up to 3/4" [19.1mm] thick.
Size Solid
#24 .00032 sq. in. [.20645mm 2 ]
#22 .00050 sq. in. [.32258mm 2 ]
#14 .00323 sq. in. [2.08386mm 2 ]
#12 .00512 sq. in. [3.30321mm 2 ]
#10 .00815 sq. in. [5.25805mm 2 ]
# 8 .01296 sq. in. [8.36127mm 2 ]
Copper Cross Sectional Area
of Commonly Used Conductors
NOTE: Use above values for solid or stranded conductors.
RC7AFFTC – 7 + 2 100
(.05214 sq in.) [33.641mm 2 ] (.05000 sq. in.) [32.260mm 2 ]
RC7STC RC7CFFTC 7 + 2 100
(.05214 sq in.) [33.641mm 2 ] (.05000 sq. in.) [32.260mm 2 ]
POKE-THRU SERVICE POWER COMMUNICATION
FITTING TYPE FITTING TYPE CONDUCTORS (A) CONDUCTORS (B)