What is the minimum acceptable temperature corrected insulation resistance value for a newly installed 5kV emergency generator?

The minimum acceptable temperature corrected insulation resistance value for a newly installed 5kV emergency generator is 100 Megohms. This standard ensures that the insulation of the generator is in good condition and safe for operation, as lower values may indicate potential insulation failures or degradation that could lead to equipment damage or unsafe operating conditions.

Insulation resistance testing is a crucial part of the commissioning process for electrical equipment, especially for generators operating at high voltages. The value of 100 Megohms serves as a benchmark that reflects reliable insulation performance, taking into account the effects of temperature and humidity on the insulation material.

Choosing a value higher than this, such as 150 Megohms, would typically constitute best practice in many cases, particularly in certain industries where additional safety margins are required. However, for newly installed equipment, 100 Megohms is recognized as the accepted minimum standard that meets industry regulations and best practices while still allowing for variations due to environmental conditions.