DEVI self-limiting heating cables

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 semiconductor 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 and the heating is thus reduced.

Opposite low air temperatures means low start-up resistance and consequently high in-rush current. This in turn 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 heating according to the temperature of an environment related to its installation place. Nevertheless, we always recommend to use thermostats to even reduce electricity consumption to the maximum.

DEVI self-limiting cables usually are 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 to keep cooper conductors separately.

DEVI self-limiting heating cables are mainly used for ice and snow melting on roofs, in gutters and down pipes, frost protection of pipes and for 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.