Following are the Typical safe ability of Transformer, Generator and Cable to withstand Isc – short circuit fault current in multiple of its In – rated current, without damage to the equipment.
| Device / Equipment | Isc Fault Current as multiple of In | Safe Withstand Duration without damage |
|---|---|---|
| Transformer | Isc = 25 x In | 300 Sec |
| Generator | Isc = 30 x In | 5 Sec |
| Cable | Isc = 25 x In | 1000 Sec |
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