What is a common cause of low insulation resistance readings?

Low insulation resistance readings are typically indicative of issues related to the condition of insulation within electrical systems. When moisture ingress occurs, it compromises the effectiveness of insulating materials, leading to lower resistance measurements. This can happen due to water exposure, humidity, or leaks, which can create a conductive path through the insulation, resulting in reduced performance or potential short circuits.

Additionally, degradation of insulating materials can occur over time due to factors such as aging, exposure to chemicals, or excessive heat. These factors can weaken the insulation, making it more susceptible to moisture infiltration and reducing the overall insulation resistance.

In practical testing, when technicians observe low insulation resistance readings, they often correlate this with either the presence of moisture or degradation of the insulation, affirming the accurate identification of the issue. Addressing these problems is critical to maintaining electrical safety and ensuring reliable system operation.