DEVI self-limiting heating cables
Among the vast range of heating solutions offered by DEVI, you can also find self-limiting cables solutions, which stand out from the regular cables, bringing you less calculation as these cables can be cut to length.
Self-limiting cables are twin-conductor cables. Inside the cable, two parallel copper conductors are connected by a temperature-dependent resistant semiconductor composite. Copper conductors and semiconductors are covered with 2 layers of insulation.
When the cable is connected, current goes through the resistant element and starts heating. As the element is heated, the resistance value rises, causing the current to decline, the heating is thereby reduced.
Opposite low air temperatures mean low start-up resistance and, consequently, high in-rush current. In turn, this means fuses must be sized accordingly. In very cold regions, the in-rush current can be limited by a soft starter. As a result, you don’t need a thermostat to regulate the work of self-limiting cables.
That’s why we call these cables ‘self-limiting’ cables – such a cable regulates its heat according to the temperature of an environment in relation to its installation place. Nevertheless, we always recommend using thermostats to maximally reduce electricity consumption.
DEVI self-limiting cables are usually sold as separate products, not sets. After choosing power parameters and an appropriate length, you can prepare the connection terminal for the cold link during installation. The second end of the cable has to be finished with the terminal in order to keep cooper conductors separate.
DEVI self-limiting heating cables are mainly used for ice and snow melting on roofs, gutters, and down pipes as well as for frost protection of pipes and temperature maintenance of hot water supply.
Using self-limiting heating cables makes your work very flexible as the cables can be cut to length on site due to the parallel power supply of the cables. The self-limiting capability of the cable ensures that the output of the cable increases or decreases according to ambient temperature.