User guide

Planning the Installation

SECTION 3

3.4 Calculation of On-Center Spacing (OC)

Inordertot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oorheatingcablecanbegin.Theformula

assumesthat3-inchspacingwillbeusedbetweentheheatingcableandwallsorxed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.