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Danfoss Heating - Page 2
Instruction 1 Introduction Danfoss SRIG Cable Danfoss Self-Regulating Iceguard pre-terminated cable is a self-regulating cable, which is mainly used for ice and snow melting on roofs, in gutters, in down pipes and on water pipes to prevent them from freezing. Self-regulating heating cables are designed with a temperature dependant resistant element between two parallel copper conductors. When the conductors are connected to the mains, a current goes through the temperature dependant resistant element which will then heat. As the element is heated the resistance value rises causing the current to decline and heating is reduced. This explains the self-regulating effect. This limiting of the output takes place independently on the entire length of the cable according to the actual ambient temperature. If the ambient temperature rises the heating effect of the cable is reduced. Due to this selfregulating capability, overheating of the cable can be avoided, also if two heating cables are touching or crossing. As self-regulating heating cables always give off a small amount of effect, it is recommended to connect the heating cable via a thermostat to disconnect the mains when heating is not required. Danfoss SRIG cables secure against ice formations in roof gutters. • No water damages on/in the house • No falling icicles or icebound roof gutters • No risks for pedestrians • No repair costs after winter • No frozen water pipes Outer sheath Screen Insulation Bonded jacket Self-regulating heating element Connecting conductor 2 12/2010 VIAMH222 Danfoss Heating Solutions