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Trace heat cables may be connected to single-phase or (in groups) to three-phase power supplies. Power is controlled either by a contactor or a solid-state controller. For self-regulating cable, the supply must furnish a large warm-up current if the system is switched on from a cold starting condition.
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.
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.
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.
NTC thermistors are widely used as inrush-current limiters and temperature sensors, while PTC thermistors are used as self-resetting overcurrent protectors and self-regulating heating elements. An operational temperature range of a thermistor is dependent on the probe type and is typically between −100 and 300 °C (−148 and 572 °F).
1972 – Polymer Self-Regulating Heat-Tracing Cable; 1972–1989 – Gravitational-Wave Antenna; 1972–1987 – Deep Space Station 43; 1972–1983 – The Xerox Alto Establishes Personal Networked Computing; 1973–1985 – Superconducting Magnet System for the Fermilab Tevatron Accelerator/Collider
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