The current TempZone loose-cable installation manual specifies a minimum bend radius of 1 inch (25 mm).
For the TempZone Floor Heating Cable covered by the linked installation manual, the cable’s bending radius during installation must be at least 1 inch (25 mm). This corrects the previous ½-inch answer.
This is a bend radius, not the spacing between parallel cable runs. Follow the matching product manual and installation plan for cable spacing and layout. Do not apply this value to a different heating-cable product or use it to justify a kink or crease.
Sources
- Manufacturer instructions (publication 9748), PDF p. 4, section 2.1.9.