How to install indoor floor heating cable without mistakes.
There are 2
basic types of floor heating cables:
VCD - One end
of the cable is to be connected to the thermostat and the other end is
VC - Both ends of
the cable are to be connected to the
Some cables are
'more powerful', some are 'weaker'.
here is by the Watts per running unit of
length of the cable.
cable is 550W/240V cable powered on one end and 'weak' 10Watts/run. meter
or 3.1 Watts/run. ft.
is 2920W/240V cable powered at both ends and 20W/run. m. or 6.25W/run.
the designations of Watts per running unit
10 Watts/run. meter
or 3.1 Watts/run. ft. (both VC & VCD)
15 Watts/run. meter
or 4.7 Watts/run. ft. (VC only)
17 Watts/run. meter
or 5.3 Watts/run. ft. (VCD only)
20 Watts/run. meter
or 6.25 Watts/run. ft (VC only)
meter or 7.8 Watts/run. ft. (VCD only)
Which one to
thicker (as thick as your cable TV wire) because they have 2 heating cores.
VC cables are
thinner as they have only one heating core. About half the size of VCD
the mud job (self leveler, mortar or thickset) the more powerful cable
can be used.
VC10 or VCD10 -
1/2" or thicker of the mud job.
VCD17 - 3/4" or thicker of the mud job.
How to install
1. Cable tacker
2. Measuring tape
4. Electric meter
cannot be cut to size. It is what it
is and over 180 models are available based on length and Wattage.
cables cannot cross or be closer than 2"!
Measure the square footage of the room. DON'T ESTIMATE, measure exactly what the
square footage is.
ONLY. Not under permanent fixtures, shower stalls, cabinets etc.
measuring the floor leave some 5-6" off the wall not covered. You could use
this area as a "buffer zone" to install the cable in later in case you will have
some cable "leftover" at the end. Remember, it cannot be cut and everything must
be used up.
anywhere between 9-15 Watts/s.f.
E.g. 193 s.f. ?
a 1900 Watts 240V cable is good for 1/2"-3/4" floor mud job.
cable is 617 ft. long.
For thicker floor
VC15/1900 or VCD17/1920 are good.
Any of the above
cables will produce 10 Watts/s.f.
After receiving the cable check the resistance or continuity of the heating
element with the meter.
Plan for the spot for flex conduit (included) for the thermostat floor
temperature sensor installation. 2-3" away from actual heating element is
to calculate the distance between each run of the cable?