Self-Regulating Heating Cable for Roof & Gutter De-icing

FINE GRX Series is a heating cable effective for de-icing  on roofs, in gutters, and in downspouts. GRX Series is  designed to withstand a harsh circumstance exposing for  long term period to sun light containing high energy.

GRX Series consists of a continuous core of conductive  polymer extruded between two copper bus wires.

GRX Series regulates its own heat output depending on  ambient temperature, as electrical current flows through  the core.

The self-regulating function of GRX Series is due to PTC  (Positive Temperature Coefficient) property, by which the electrical consumption of GRX Series is reduced in the application.

Unlike ordinary metal resistance wire which produces heat  output corresponding to its length, the core of GRX  Series  is composed of the infinite parallel connection of carbon  particles. The parallel circuitry allows the cable to be cut  to the exact length required, with no wasted cable.

Especially, the self-regulating conductive core and insulation jacket of GRX Series are treated with irradiation cross-linking reaction, yielding excellent heat resistance and cable stability in long term operation.

Product construction

Product construction

1.Copper bus wire
2.Self-regulating conductive core
3.Inner adhesive jacket.
4.Modified polyolefin jacket
5.Tinned-copper braid
6.Modified polyolefin outer jacket (-CR) 
Fluoropolymer outer jacket (-CT)

Product characteristics and design information

Nominal   power output 40 W/M in iced water
Max.   maintenance temperature 90℃  
Min.   installation temperature -20℃  
Service voltage GRX1 100 - 120 Vac  
GRX2 200 - 277 Vac  

Fine Korea offers a full range of Accessories, which are roof clip and downspout hanger.

These accessories must be used all together to ensure proper functioning of the product and compliance with warranty, code, and requirements of approvals.

Power output graph

Max. length (m) vs. Circuit breaker size

  start-up temperature 20A 30A 40A 50A
GRX40 - 1 CR/CT 120V 10℃ 30 40 60 -
0℃ 28 37 55 60
-20℃ 23 30 45 55
     CR/CT 240V
10℃ 60 80 120 -
0℃ 55 75 110 120
-20℃ 45 60 90 110


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