High Heat Output
When the heating cable is cold, the conductive polymer heating core contracts microscopically, increasing the number of electrically cunductive paths. Electric current flow is higher and heat output is higher...generating heat only when it is needed and precisely where it is needed.

Moderate Heat Output
As the heating core warms and expands microscopically, some of the conductive pathsare opened, reducing the electrical current flow and reducing heat output...eliminating any possibility of over–heating.

Low Heat Output
In areas where the heating cable is warmest, the number of conductive paths through the core is lowest. Current flow through the core is low and little heat is produced...conserving energy during operation.


Raychem's self–regulating heating cables consist of two parallel conductors embedded in a heating core made of conductive polymer. The core is radiation–crosslinked to ensure long–term reliability.

Raychem's self–regulating heating cables automatically adjust their power output to compensate for temperature changes. The heating cable is sensitive to local temperatures: as they drop, electrical resistance decreases. As a result, current flow between the conductors increases and more heat is generated. Conversely, resistance increases as temperatures rise, reducing heat output.

Occuring automatically and independently at each point in the heating cable, self–regulation ensures heat generation only when it is needed, only where it is needed. The benefits are distinct and measurable.

Through a combination of self–regulating technology and parallel circuit design, our heating systems:

1. Are cut to length, spliced, tee'd, and terminated in the field.
2. Can be safely overlapped without forming hotspots.
3. Adjust heat output continuously along the heater length, minimizing energy consumption and costs.
4. Accommodate site changes, take up little space, and are easy to specify.

All of these features give you:

1. Engineering flexibility
2. Ease of installation
3. Uniform temperatures
4. Reliability
5. Lower installed cost
6. Lower operating costs