My initial order was too long.
So I returned it and got a shorter cable without any problems. We are very peased with the results. Our floor stays at a minimum of 50 degrees year round which is where we set the thermostat. Putting a heating element under the floor of our three-season porch was one of the best decisions I ever made in upgrading my home. This winter we may inrease the temperature of the floor because we expect to use the porch more during the winter. The underfloor heat from Warmly Yours is the only heat that is in that porch.