Self-limiting heating cables
Self-limiting heating cables are very easy to handle in application. The heating cable core consists of a carbon-plastic mixture, which is extruded over two parallel conductors. The result of this mixture are flow paths between the conductors, whose numbers varies depending on the temperature. If the environmental temperature goes down, the heat power increase. The current paths are associated on a molecular level and the result is a higher current flow and thus a higher heat power. If the environmental temperature goes up, the heat power decrease. The number of current paths at the molecular level decreases, thus the resistance increase and the heat power decreases. This happens at every point of the heating cable, according to the environmental temperature. Due to this the heating cable doesn´t overheat even if it crosses with the other. Self-limiting or power limiting heating cables can be used depending on the version up to +260 °C.