Broadband Applications & Construction Manual - Public - CommScope

9.5 Residential Interior Cabling
Walls from Below
Crawlspace and Basement
Prior to entering a crawlspace or an unfinished basement, look and make sure that your planned entry point is
not blocked by plumbing or unexpected obstructions like spoil left during construction. It may be possible to bring
the cable through the crawlspace entrance. If not, use a masonry bit to drill through the foundation. Insert a feedthru
bushing and pull the cable through; allow plenty of extra cable for reaching the outlet on the main floor.
In a finished basement, plan your point of entry as close to the ceiling as
possible and drill from the inside. Place your feed-thru bushing and run the
cable to the inside. With a hung ceiling, you may be able to run the cable
on top of that, attaching the cable to floor joists. Otherwise, run the cable
around the top edge of the room, and then cross to your ceiling entry parallel
to the walls. Wire mold can be used to hide the cable.
Finding the Wall From Below
At the outlet location, trace and cut your outlet hole. Then use a stiff, sharp
piece of wire to drill a pilot hole right at the base of the toe molding (to
leave no sign of a pilot hole at all, remove the toe molding and drill from the base of the remaining molding or
the drywall). When you feel you’ve broken through the floor, detach the wire from the drill and leave it
in the floor.
Go under the floor and locate the wire. Measure
in about 1 in (2.5 cm) (more if you drilled in at a
very steep angle) and, using a thin bit, drill a pilot
hole straight up to make sure you’re in the wall. Enlarge
the hole to accommodate the cable and pull
through enough for easy connectorization.
Use cable clips to attach cable to the floor joists.
tech tip:
when drilling, use
the sharp, stiff wire
used to hold floor
insulation in place
or a piece of
coathanger -
a drill bit will
tear up carpet