Final answer:
A diode wired as an insulator has a reverse bias, indicating a high impedance or blocking state which corresponds to a non-conductive state.
Step-by-step explanation:
When a diode is wired so that it acts as an insulator, it is said to be in a reverse bias configuration. In reverse bias, the positive side of the battery is connected to the n-type material, which widens the depletion layer and increases the potential energy difference across the p-n junction. As a result, there is minimal to zero current flow through the diode, indicating that it has a high impedance or a blocking state, both of which suggest that the diode is in a non-conductive state.