Short Circuit Data: cable
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 typical (dimensionless) |
|---|---|---|---|---|
| cable | 15KV_MV_CU | 15kV class MV cable | 2 | 0.5 |
| cable | 5KV_MV_CU | 5kV class MV cable; higher X due to shielding capacitance | 1.5 | 0.4 |
| cable | 600V_350KCMIL_CU | Per 1000ft; copper conductor 600V | 3 | 0.8 |
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