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Mineral insulated cable

Mineral insulated cables are used primarily as heating units and power cables. Mineral-insulated cables typically comprise one or more wire conductors contained within a bendable metal sheath. A mineral filler is disposed in the sheath to maintain separation and electrical isolation between the sheath and the conductors. Those cables have an outer sheathing in the form of a metal tube, one to seven conductors, and insulation of magnesium oxide around the conductors which insulates and also holds the conductors in place inside the metal tube. The insulation employed in mineral-insulated cables generally consists of a compacted mineral powder or other particulate, such as powdered magnesium oxide (MgO) or powdered aluminum oxide. Magnesium oxide (MgO) is preferably used as the insulation material for the metal sheathed mineral-insulated cables because it is stable at high temperatures and inert with the sheath and conductor materials. It provides a high electricity resistance and is also economical.

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