Assuming unlimited utility fault current yields overly high results, potentially oversizing equipment unnecessarily (costly) but safe. However, it may also mask coordination issues.
For (for electromechanical forces): I_peak = I_sym × √2 × (1 + e^(-π/(X/R))). For X/R=4.2, factor ≈ 2.2, so peak = 34,960 × 2.2 = 76,912 A. short circuit current calculator
This method uses Ohm’s Law directly:
For more information on short circuit current calculation and electrical system design, we recommend the following resources: Assuming unlimited utility fault current yields overly high