What is the typical insulation resistance measurement for a healthy electrical system?

A typical insulation resistance measurement of 1 megohm or higher is considered a good indicator of a healthy electrical system. Insulation resistance is crucial for preventing short circuits and ensuring safety. Measurements at or above this threshold indicate that the insulation material is still effective in preventing electrical leakage.

It is generally accepted that the insulation resistance should ideally be significantly higher than this value to provide a further safety margin. Such a reading helps to ensure that the system is functioning correctly and has not degraded over time due to factors like moisture, temperature fluctuations, or physical wear and tear.

In contrast, lower resistance values, such as 0.5 megohm or lower, suggest that insulation may be compromised, increasing the risk of electrical failures or hazards. Similarly, while values like 2 megohms and 5 megohms may reflect acceptable performance, they do not represent the standard threshold for a healthy system. Being above 1 megohm is often the benchmark used to assess insulation integrity in typical electrical systems.