A sudden drop in insulation resistance reading using a megohmeter indicates what?

A sudden drop in insulation resistance reading using a megohmeter indicates that a problem is developing. Insulation resistance measurements are critical for evaluating the health and integrity of electrical systems. Typically, a high insulation resistance reading suggests that the insulation is intact and functioning properly, providing a barrier against leakage currents and ensuring safe operation.

When there is a sudden drop in the insulation resistance value, it can signal the presence of moisture, contamination, or deterioration of the insulation material. This change often points to potential insulation failure, which can lead to short circuits, electrical shocks, or equipment damage if not addressed promptly. Therefore, monitoring insulation resistance is vital for preventive maintenance to catch issues early before they result in significant operational failures or safety hazards.