Self regulating heating cables that automatically adjust their power output to compensate for temperature changes. Self regulate heat trace cables are the advance technology in electric heating cables. They are designed and manufacture to regulate their output according to process temperature i.e. as the process temperature go down , the cable’s output increases; opposite, as the temperature rises, the cables output decreases. Self regulating heating cable contain a polymer core extruded onto two parallel conductors. The core consist semi-conductive material that is high in carbon content usually “graphite”, which allows electricity to flow from one bus wire to the other and create infinitely parallel resistors. The core’s resistance changes proportionally with temperature changes and the output varies along the length of the cable depending upon the temperature of the core of the heater. The fundamental principle of operation is that “when the temperature of the core increases or decreases, a change in the chemical composition takes place, which results in a increase decrease resistance and more or less heat output watt. This self regulating properties allows the cable to adjust its watt output at any point along the entire length of the heater circuit, helping to remove warm or cold spots.