Just to clarify im replacing the cord on my racks with tape (tired of the cord failing and tape heats better anyways). Ive done electrical work before and have the end plugin I will be running to the thermostat but between each shelf from end to end there is no indication on what wire the manufacturer reccomends. Too thin and it will burn out/overload and pose a fire hazard and too thick is a waste of money as well as other complications. I was really kind of suprised in all the pdfs on flexwatt they never have a reccomended wire for it listed.