A sudden drop in insulation resistance reading on a megohmmeter suggests what?

A sudden drop in insulation resistance reading on a megohmmeter indicates that there may be developing trouble within the electrical system or equipment being tested. Insulation resistance is a critical indicator of the condition of insulation in electrical wiring or components. Ideally, high resistance values reflect healthy insulation, while a significant drop can signal problems such as moisture ingress, physical damage, or insulation deterioration.

When such a drop occurs, it is essential to investigate further as it can lead to faults that may result in short circuits or equipment failures. This finding typically necessitates immediate evaluation and corrective action to prevent potential electrical hazards or system failures, emphasizing the importance of insulation integrity in maintaining safe and reliable electrical operations.