These heat tape cables are ready to plug-in and prevent ice dams or protect pipes from freezing–right out of the box. No assembly required! Self regulating heat tape refer to a class of electrical heating cables that senses the conditions around it, specifically outdoor temperatures, to determine how much energy it needs to do its’ job. Ice dam prevention using self-regulating heat cables is far more affordable over the long run than using ‘constant wattage’ cable (often found at big box retailers).