King Electric FCM Floor Mat - Manual (Page 12)

King Electrical Floor Heating Mat Installation Manual 12
STEP 4: Electrical rough-in (New construction)
Mount Electrical Box Drill Horizontal Hole
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.
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.
4.4 Clear the cable routing holes of debris
and install in the same stud cavity.
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.
Install Nail Plate
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.