Hello, Why do self regulating heating cables have such low power output per foot? Power output in these cables does not exceed 20 W/ft at 10 degree C, and decreases as the temperature goes up. Many of the cables I saw can withstand high temperatures (250 degree C power off and 150 degree C power on), so why can't we supply more current to get more heat density? The manufacturers of such cables provide the maximum current to be supplied as a value per foot, so that the longer the cable the more current you can apply through it. Which I don't understand, what happens if I applied more than the max rated current in short cable, and made sure that heat transfer coefficient is high enough. One of the cables datasheet here.