WarmlyYours TempZone Floor Heating Cable (Twin) - Manual (Page 8)

Planning the Installation SECTION 3
5
3.4 Calculation of On-Center Spacing (OC)
In order to fit the TempZone™ Floor Heating Cable (Twin) properly in the designated space, it is necessary to determine the
spacing between the cables. This is called on-center spacing or OC. Refer to either the “Product Selection Guide--120V” or
“Product Selection Guide--240V” in section 9 to determine appropriate spacing for the installation.
Combine cable lengths if more than one is needed for the installation. Once the OC spacing has been calculated and the
correct length of cable for the area to be heated is obtained, installation of the floor heating cable can begin. The formula
assumes that 3-inch spacing will be used between the heating cable and walls or fixed objects, and full OC spacing
between cable runs. To make cable placement easier, make a measuring template out of cardboard in the width of the OC
spacing less the thickness of the cable. Place the template along to the cable run just completed to determine where the
next run of cable should be positioned.
IMPORTANT: To avoid overheating, OC spacing should not be less than 3 inches and area loading should not
exceed 15 watts/square foot.
IMPORTANT: Do not order more cable than necessary as cable cannot be shortened.