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Short-Circuit & Per-Unit Studies

Fault Calculation: 1,000 kVA Transformer and Parallel Cables, 19.92 kA

A 12.47 kV/480 V, 1,000 kVA transformer (5.75% impedance, X/R of 5) with three parallel 500 kcmil copper conductors per phase over 50 ft to a switchboard. The total impedance of 13.912 mΩ gives a 19.92 kA bolted three-phase fault.

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