Why is the furnace shell of the induction melting furnace electrified?

When the furnace shell of the induction melting furnace is electrified, there is a problem with the insulation. The furnace should be shut down for inspection immediately. It should not be used continuously. Check whether the furnace shell and the furnace ring are in contact. Does the molten iron lining the furnace wall flow onto the furnace shell? Check whether the grounding wire of the furnace shell is disconnected? The furnace shell should be grounded during normal use. It can be used only when the furnace shell is grounded by steel plate.