Tests on LV Cables
§ An insulation resistance test shall be conducted with a 1000 Volt megger. Test results as low as 10 meg-ohms on old cable circuits are common and therefore considered safe for energy.
Test on 11kV and 33kV Cables between Cores and Earth
§ For three core belted cables, the test on any core shall be conducted between the core and lead sheath with the remaining two cores connected to the earth.
The test voltages and pass criteria shall be in accordance with the table below.
Application | Test Voltage | Criteria |
| 11kV new cables | 5kV Megger 1 minute | 100 meg-ohms. |
| 11kV after repairs | 5kV Megger 1 minute | 100 meg-ohms. |
| 33kV – no TFs connected | 5kV Megger 1 minute | 1000 meg-ohms. |
| 33kV – with TF connected | 5kV Megger 1 minute | 15 meg-ohms. |
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