What is a good PI value?

The polarization index (PI) is a crucial parameter in assessing the health of electrical insulation. It provides valuable insights into the condition of insulation materials, which are essential for the SAFE and efficient operation of electrical equipment.

A high PI value is indicative of healthy insulation, as it suggests that the material is effectively resisting the flow of leakage current. This is crucial for maintaining the integrity of the insulation and preventing potential electrical hazards.

Conversely, a low PI value can indicate potential problems with the insulation. It may suggest that the material is deteriorating or has been compromised, allowing for increased leakage current and potentially leading to electrical faults or failures.

The ideal PI values vary depending on the specific application and insulation material. However, a PI value above 2 is generally considered good, indicating that the insulation is in good condition.

On the other hand, a PI value below 1.5 is considered hazardous and may require immediate attention. This low value suggests that the insulation is no longer effective in preventing leakage current and may pose a significant risk to the safety and reliability of the electrical equipment.