SELF REGULATING HEATING CABLE

CABT

 

CONSTITUTING

Self-regulating heating cables, with varying output, are of parallel type (to be cut to length on the job site).

Their output is directly dependant on the surrounding temperature. They include two bus wires embedded in a PTC semi conductive compound (positive temperature coefficient).

The ohmic resistance of this semi conductive compound increases proportionally with its temperature.

So, will the dissipated power decrease when the temperature increases and reach an equilibrium value.

The cable is sheathed with polyolefin (grade 85°C).

A metallic braid (tinned copper or stainless steel) can be proposed, assuming a better mechanical protection and allowing to perfectly earth the installation.

An over jacket is proposed when corrosives risks are present.

WORKING PRINCIPLE

OUTPUT WATT PER METER

APPLICATIONS

The CABT/POLY self-regulating heating cables are usually designed for the following applications :

· Freeze protection of pipes

· Temperature maintenance in pipes up to 40°C

MAIN ADVANTAGES

This technology involves the following advantages :

· Temperature intrinsic limit of 65°C

· To be cut to length ( ever for some millimeters )

· Possible derivations and tee connections
(energy is available on the whole length of the heating cable)

· Thermostat is not indispensable in some cases

· Standard : 230 V

MAIN CHARACTERISTICS

Circuit maximum length : 110 to 120 meters or 2500 W
Maximum exposure temperature when energized : 65°C
Maximum exposure temperature when de energized : 85°C (continious)

Maximum exposure temperature when de energized : 95°C (occasionnal)

Electrical protection (fuses) : nominal power * 2 to 3

Differential protection : 30 mA

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SUMMARY