Compare meggered insulation resistance against IEC 60092-507 minimum - 1 MΩ for < 500 V systems, higher for HV.
Formula
$$ IR_{min} = \max\left(1,\ \frac{V_n}{500}\right) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V_n$ | Nominal voltage | V | system spec |
| $IR$ | Insulation resistance | MΩ | megger test |
Sources
- IEC 60092-507 / IEEE 43.