Self-regulating cable uses two parallel bus wires which carry electricity but do not create heat. They are encased in a semi-conductive polymer. The cables are extruded and then irradiated to cross-link the polymer and hold the shape. This polymer is loaded with carbon particles which conduct electricity between the bus wires. As the polymer core warms, it expands and the carbon particles spread apart reducing electrical paths and therefore current flow.

FSPC1 Trace Ready Cable