What is the NETA-MTS recommended minimum insulation resistance value for a 15kV 600A HVL switch?

The NETA-MTS recommends a minimum insulation resistance value of 5 Gigohms for a 15kV 600A HVL switch. This high insulation resistance value is crucial for maintaining the reliability and safety of high-voltage equipment. A robust insulation resistance indicates that the insulating materials are effectively preventing electrical leakage that could lead to failures or hazards.

High voltage apparatus, like a 15kV switch, is subjected to various environmental conditions that can degrade insulation over time, such as moisture, dust, and temperature fluctuations. Therefore, specifying a minimum of 5 Gigohms ensures a strong margin against potential insulation breakdown, which could result in short circuits or electrical shocks.

This level of insulation resistance is significantly higher than those proposed in other choices, which would not provide the necessary assurance of safety and functionality in high-voltage applications. The recommendation for 5 Gigohms is aligned with industry standards aimed at ensuring the longevity and operational integrity of electrical systems.