Self-regulating heating cable, also known as self-limiting heating cable, is a type of electrical heating device used for various applications related to temperature maintenance and frost protection. It is designed to regulate its own heat output based on the surrounding temperature, providing efficient and reliable heat where and when it is needed.
The unique characteristic of self-regulating heating cables lies in their construction. They consist of a conductive core, usually made of carbon or other conductive polymers, surrounded by an insulating layer and an outer protective jacket. As the ambient temperature decreases, the conductive core contracts, causing the distance between the conductive particles to decrease. This results in an increase in electrical resistance and, consequently, a decrease in heat output. Conversely, when the temperature rises, the core expands, leading to a decrease in resistance and an increase in heat output.