Mineral insulated heating cables

Mineral insulated heating cables are constructed from a resistive conductor insulated with magnesium oxide and a continuous metal outer sheath extruded in a seamless line.
The extreme robustness of the cable and the use of materials such as magnesium oxide, cupronickel, stainless steel or inconel make it the only solution available for design temperatures above 350°C and up to 800°C.
These are cables in which the power supplied is constant, meaning it does not vary as the temperature varies: they are based on the Joule effect and it is the conductor itself that produces a current that generates heat when energized and crossed by electric current. The cable must be energized at both ends.
They are generally supplied in circuits ready for installation: once the heating circuit, or rather the type of cable with its resistivity and length, has been determined, this length can no longer vary; a variation in it leads to a variation in the power supplied, which may be less than necessary (longer circuit) or more (shorter circuit) with the danger of subjecting the heating cable to excessive temperatures with the risk of damage and a reduction in the life of the circuit itself.

Advantages:

• Possibility of low voltage or 380- 500V ac power supply, including three-phase
• Constant power at any temperature without the need for oversized start-up absorption protections
• Applications in explosion and fire hazard zones with limiting thermostats
• Availability of a wide ohm/meter resistivity range

Examples of application:

• Maintenance of products with temperatures up to 500°C
• Antifreeze even on steam pipes with operating temperatures up to 650°C
• Particularly suitable for industrial processes when the temperature to be maintained is high
• Particularly suitable in heating processes