What is the typical insulation resistance value for equipment rated at 480V?

The typical insulation resistance value for equipment rated at 480V is usually around 100 megohms. This value is established as a good standard to ensure that the insulation is adequate to prevent electrical leakage or failures, which can lead to equipment damage or safety hazards. A minimum of 100 megohms indicates that the insulation is in good condition, providing a sufficient buffer against short circuits and electrical breakdowns in a variety of environmental conditions.

Insulation resistance testing is an essential part of maintaining electrical systems, especially for higher voltage equipment, as it helps ensure long-term reliability and operational safety. Values significantly below this standard could indicate potential problems with the insulation, requiring further investigation or maintenance. Thus, aiming for an insulation resistance value of 100 megohms is a prudent practice when working with 480V rated equipment.