King Electrical Floor Heating Cable Installation Manual
12
4.1
Determine the proper location and
height (typically 60”) for the
junction box. The cold lead and
the floor sensor lead wires should
be in the same stud cavity as the
electrical junction box. Install the
junction box for the thermostat and
run the power supply wires into the box.
STEP 4: Electrical rough-in (New construction)
Mount Electrical Box
Drill Horizontal Hole
4.2
Drill a 3/4” hole 1-1/2” deep horizontally
into the sill plate for the cable routing. Drill
the hole as close to the bottom of sill plate
as possible. Chisel out the bottom of the
sill so that the cold lead wire will not
create a high spot in the floor when
the thin-set is applied.
Drill Vertical Hole
4.3
Drill a 3/4” hole vertically into the sill plate
1-1/2” deep. If installing a floor sensor,
drill a second set of holes 4”away in the
same stud cavity.
Install Nail Plate
4.4
Clear the cable routing holes of debris
and install in the same stud cavity.
4.5
It is recommended to thread a pull string
as the cable installation will be done after
the drywall is in place. Run a second pull
string if a floor sensor is being installed.
Otherwise the wires can be fished through
the wall with an electrician’s fish tape after the
drywall is installed.
