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You're looking for a review of an earth conductor size table!

| Fault current (kA) | Duration of fault (s) | Ambient temperature (°C) | Conductor size (mm²) | | --- | --- | --- | --- | | 1 | 1 | 20 | 10 | | 5 | 5 | 30 | 25 | | 10 | 10 | 40 | 50 |

Keep in mind that this is a highly simplified example and actual tables may be more comprehensive and complex.