Mineral insulated cables are used primarily as thermocouples and heating units. It typically comprises one or
more wire conductors contained within a bendable metal sheath. Magnesium oxide powder is disposed in the
sheath to maintain separation and electrical isolation between the sheath and the conductors. MgO is preferably
used as the insulation material for the metal sheathed mineral insulated cables because it is stable at high

temperatures, it provides a high electricity resistance and is also economical