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| Minimum values of insulation resistance (Table 71A of BS 7671) | ||
| Circuit nominal voltage (V) | Test voltage (V) | Minimum insulation resistance (MV) |
| Selv and Pelv (less than 50 V) | 250 | 0·25 |
| Low voltage (50–500 V) | 500 | 0·5 |
| Over 500 V | 1000 | 1·00 |