Consider the following three-phase short circuit: With A….
Consider the following three-phase short circuit: With A. 1000 kVA Transformer with 480V, 3Ph, 3.5% Z B. 25′ – 500kcm copper, 3 single conductor 6 per phase service entrance in steel conduit C. 2000 A switch with 2000 A fuse x1 Fault X1 D. 400 A switch with 400 A fuse E. 50′ – 500kcm copper, 3 single conductor feeder cable in steel conduit x2 Fault X2 Using Point-to-Point calculation (using the given impedance at 100%) The total current for short circuit sym RMS at Fault X1 is The total current for short circuit sym RMS at Fault X2 is