Short Circuit Data: utility_source
Typical equipment impedances (%Z) and X/R ratios for short circuit calculations per IEEE 141 (Red Book) and IEEE 551 (Violet Book). Covers transformers by kVA, utility sources by voltage level, cables, motor contributions, generators, and reactors.
| equipment type | rating label | notes | xr ratio max (dimensionless) | xr ratio min (dimensionless) | xr ratio typical (dimensionless) |
|---|---|---|---|---|---|
| utility_source | DISTRIBUTION_13KV | At 13.8kV distribution feeder; typical utility PCC | 15 | 4 | 8 |
| utility_source | DISTRIBUTION_4KV | At 4.16kV distribution bus | 10 | 3 | 5 |
| utility_source | SERVICE_480V | At 480V service (utility or secondary bus) | 8 | 2 | 4 |
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