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Insulator condition dependent on experimentally determined indicators values.
| Indicator | Normal range | Abnormal range | Critical range | Pre-flashover value |
|---|---|---|---|---|
| C1 | < 1.165 | > 1.165and < 2.86 | > 2.86 | > 10 |
| C2 | > 59.3 | > 18.7 and < 59.3 | < 18.7 | ≈ 0 |
| C3 | < 1.53 | > 1.53 and < 5.1 | > 5.1 | > 28 |
| C4 | < 1.6 | > 1.6 and < 2 | > 2 | > 2.8 |
| C5 | < 15 | > 15 and < 45 | > 45 | > 65 |
| C6 | > 3 | > 1 and < 3 | < 1 | < 0.4 |
| C7 | < 0.62 | > 0.62 and < 0.73 | > 0.73 | > 0.85 |
