The SRH and WFP heating cables have a carbon / polymer core that is carefully and thoroughly mixed and then extruded onto the two parallel conductive bus wires. The parallel feature allows for "cut-to-length" in the field without changing the power output per foot.
Electrical current runs from one bus wire through the carbon particles to the other bus wire. The resistance of the carbon particles generates heat. As the heating cable heats up, the polymer mixture expands faster than the carbon particles, separates the carbon particles, and creates an increasing resistance. This increasing resistance slows down the current flow and thus reduces the power output of the heater.
Unlike constant wattage heating cables, our WFP self-regulating heating cables cannot generate enough heat to burn themselves out or cause materials nearby (leaves, debris, etc.) to ignite - regardless of how they are installed on the roof or on the pipe.
In addition, all heat tracing circuits must be ground fault protected in accordance with the National Electric Code. This prevents an arcing fault from igniting any combustible materials in close proximity to the heating cable.
Power Output Curves
Freeze Protection Cable
Process Maintenace Cables
Heating Cable, Components and Accessories
