Infloor Electric Cable Series 386 - Manual (Page 10)

IOM-INF-Cable 1434 10 of 36
STEP 2.3:
Bottom Plate Work
Drill or chisel holes at the bottom plate as indicated. One hole is for routing the power lead
conduit and the other is for the thermostat sensor. These holes should be directly below
the electrical box(es).
Power lead
conduit
Wire
Clip
Power
lead
Sensor wire
Sensor wire
If going in to an existing wall, cut out
dry wall and chisel out bottom plate
to route wires to control.
STEP 2.4:
Install Power Lead Conduit and Thermostat Sensor
Power Lead Conduit:
The shielded power lead can be installed with or without electrical conduit (recommended
for added protection against nails or screws) depending on code requirements. Remove
one of the knock-outs in the electrical box to route the power lead. If electrical conduit is not
required by code, install a wire collar to secure the power leads where they enter the box. If
conduit is required by code, install 1/2" (minimum) conduit from the bottom plate up to the
electrical box. For multiple power leads (multiple cables) install 3/4" conduit.
Infloor Thermostat Sensor:
The Infloor sensor should be installed in a plastic sensor tube (P/N 29011) or electrical conduit.
Sensor tube or conduit is recommended for added protection against nails or screws. Do not
place the sensor in the same conduit as the power leads to avoid possible interference. Open
a separate knock-out in the bottom of the thermostat box. Feed the sensor tube or conduit
through the knock-out, down through the cut-out in the bottom plate, and out into the floor
where the heating cable will be installed. Feed the thermostat sensor down the sensor tube.
STEP 2.5:
Rough-in Wiring:
Install appropriate 12 or 14 AWG electrical wire from the circuit breaker or branch circuit
source to the Infloor Thermostat electrical box (and Infloor Relay box(es) if needed) following
all codes, see Table 5.
If Infloor Relay(s) are used, feed appropriate wire (see Infloor Relay installation manual for
size and type) between the Infloor Relay(s) and the Infloor thermostat.
See Infloor Relay instructions for details of wire size and type.