GRX
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
| 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 | |
| GRX40-2 CR/CT 240V |
10℃ | 60 | 80 | 120 | - |
| 0℃ | 55 | 75 | 110 | 120 | |
| -20℃ | 45 | 60 | 90 | 110 |