Self-Regulating Heat Tracing Cable (SR) is a self–regulating heating cable that provides maximum freeze protection for pipelines and vessels. it can be used for other applications for a snow melt and de-icing such as roof, gutter and downspouts. The self–regulating heating cable automatically varies its heat output as the surrounding temperature changes. The cable it operates in the only following voltages, 120,208,220,240,277.