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Self-limiting thermoplastic cables were marketed in 1971. [4] Control systems for trace heating systems developed from capillary filled-bulb thermostats and contactors in the 1970s to networked computerized controls in the 1990s, in large systems that require centralized control and monitoring. [5]
A similar-appearing product is mineral-insulated trace heating cable, in which the conductors are made of a high-resistance alloy. A heating cable is used to protect pipes from freezing or to maintain the temperature of process piping and vessels. An MI resistance heating cable may not be repairable if damaged.
A positive-temperature-coefficient heating element (PTC heating element), or self-regulating heater, is an electrical resistance heater whose resistance increases significantly with temperature. The name self-regulating heater comes from the tendency of such heating elements to maintain a constant temperature when supplied by a given voltage.
Besides circuit elements used to limit current, self-limiting heaters can be made in the form of wires or strips, useful for heat tracing. PTC thermistors "latch" into a hot / high resistance state: once hot, they stay in that high resistance state, until cooled.
Renamed Pentair Thermal Management, this group continues to provide customers with the Raychem brand name for industrial, commercial and residential trace heating solutions. TE Connectivity sells the other original Raychem products (shrink tubing, wire and cable, SolderSleeve Devices, etc.) under the Raychem brand name.
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