1. Wall Assembly — Min 5 in. (127 mm) thick reinforced lightweight or normal weight (100-150 pcf or 1600-2400 kg/m³) concrete. Wall may also be constructed of any UL Classified Concrete Blocks*. Max diam of opening is 3 in. (76 mm).

See Concrete Blocks category in the Fire Resistance Directory for names of manufacturers.

2. Cables — Aggregate cross-sectional area of cable in opening to be max 40 percent of the aggregate cross-sectional of the opening. Cables to be centered and rigidly supported on both sides of floor or wall assembly. The following types and sizes of copper conductor cables may be used:

A. Max 50 pair No. 24 AWG (or smaller) copper conductor telephone cables with polyvinyl chloride (PVC) insulation and jacket materials.

B. Max 2/C (with ground) 12 AWG (or smaller) PVC insulated and jacketed nonmetallic sheathed cable.

3. Firestop System — The firestop system shall consist of the following:

A. Packing Material — Min 2-1/2 in. (64 mm) thickness of min 4 pcf (64 kg/m³) mineral wool insulation firmly packed into opening as a permanent form. Packing material to be recessed from both surfaces of wall as required to accommodate the required thickness of fill material.

B. Fill, Void or Cavity Material* — Caulk or Putty — Min 1-1/4 in. (32 mm) thickness of fill material applied within annulus flush with both surfaces of wall. Fill material to be forced into interstices of cable bundle max extent possible. Additional fill material to be installed such that a min 1/2 in. (13 mm) crown is formed around the cable bundle on both sides of the wall assembly.

RECTORSEAL — FS900, FS901, FS903, FS903CG, FS905, FS905CG, FS929, FST901, FST903, FST905, FSP 1000 Putty, Metacaulk 150+