Transformer Fault Current Ranges
This calculation assumes an infinite bus, and the values provided are calculated at the secondary terminals of the transformer. For additional fault information, please contact [email protected].
Note: CoServ reserves the right to make system modifications including feed changes and transformer upgrades to maintain service without customer notification. System modifications can result in higher fault currents.
Service
| Phasing: | 1 | |||
|---|---|---|---|---|
| Voltage: | 120/240 | 240/480 | ||
| kVA Rating | Minimum Available Fault (A) |
Maximum Available Fault ( A) |
Minimum Available Fault (A) |
Maximum Available Fault ( A) |
| 10 | 1,042 | 2,778 | 521 | 1,389 |
| 15 | 1,563 | 4,167 | 781 | 2,083 |
| 25 | 2,604 | 6,944 | 1,302 | 3,472 |
| 37.5 | 3,906 | 10,417 | 1,953 | 5,208 |
| 50 | 5,208 | 13,889 | 2,604 | 6,944 |
| 75 | 7,813 | 20,833 | 3,906 | 10,417 |
| 100 | 10,417 | 27,778 | 5,208 | 13,889 |
| 167 | 17,181 | 34,792 | 8,591 | 17,396 |
| 250 | 16,855 | 52,083 | 8,428 | 26,042 |
Service
| Phasing: | 3 | |||
|---|---|---|---|---|
| Voltage: | 120/208 | 277/480 | ||
| kVA Rating | Minimum Available Fault (A) |
Maximum Available Fault ( A) |
Minimum Available Fault (A) |
Maximum Available Fault ( A) |
| 75 | 3,621 | 7,710 | 1,569 | 3,341 |
| 112.5 | 5,431 | 10,073 | 2,353 | 4,365 |
| 150 | 7,241 | 13,431 | 3,138 | 5,820 |
| 225 | 10,862 | 20,146 | 4,707 | 8,730 |
| 300 | 14,482 | 26,862 | 6,276 | 11,640 |
| 500 | 24,137 | 31,905 | 10,459 | 13,825 |
| 750 | 33,868 | 39,131 | 14,597 | 16,957 |
| 1000 | 19,463 | 22,609 | ||
| 1500 | 29,194 | 33,914 | ||
| 2000 | 38,926 | 45,219 | ||
| 2500 | 48,657 | 56,523 | ||