Enter the transformer's kVA and %Z, the utility's figure if you have it, and up to three runs of conductor. The app gives the available fault current, 3-phase and L-N, at the service, the switchboard and the branch terminal, the 110.24(A) marking line, and a PDF.
The app’s own example, every screen in order, 13 steps.
STEP 1 OF 13The example opens filled in: 750 kVA, 5.94 %Z at 480 V with the utility's 44,990 A, the answer pinned at the foot.
STEP 2 OF 13The source: Three Phase 480/277, 750 kVA, 5.94 %Z from the nameplate, worst-case tolerance, utility 44,990 A.
STEP 3 OF 13A warning: 44,990 A is more than this transformer can deliver, 16,875 A. The higher figure is used. Stage 1 starts, in feet.
STEP 4 OF 13Stage 1, the service: 40 feet, 3 sets of 600 kcmil copper in nonmetallic raceway.
STEP 5 OF 13Stage 2, the switchboard / feeder: included, 40 feet, 3 sets of 600 kcmil copper in metal raceway, three phase.
STEP 6 OF 13Stage 3, the branch circuit: included, 145 feet, 1 set, copper in metal raceway, three phase.
STEP 7 OF 131/0 phase and neutral. The answer: 11,812 A 3-phase at the branch terminal. The 110.24(A) marking line, 41,765 A, to copy.
STEP 8 OF 13The one-line: 41,765 A at the service, 38,405 A at the switchboard, 11,812 A at the branch terminal. FLA 902 A.
STEP 9 OF 13The working, stage 1: f = 0.077, M = 0.928, 41,765 A 3-phase and 38,969 A L-N at the main disconnect.
STEP 10 OF 13Stage 2 to 38,405 A and 33,497 A L-N. Stage 3 to 11,812 A and 6,795 A L-N at the branch terminal.
STEP 11 OF 13The formulas, and the method and C constants from Cooper Bussmann's Electrical Plan Review. Motor contribution not included.
STEP 12 OF 13The report, named Example - 750 kVA service: save or share the PDF, or save the job.
STEP 13 OF 13The PDF, page 1: the inputs, the one-line with all three fault points, the answer and the 110.24(A) marking.
The same 13 screens with the captions burned in. No sound.
MP4, 1.6 MB, 14 seconds.
The PDF report for the same job, all 2 pages as the app writes it.
On Android, $49.99 once. Everything on this page.
The Suite has the point-to-point fault current calculation. The corrected L-N figures and C constants, the %Z tolerance, the warning when the utility figure is more than the transformer can deliver, the one-line and the 110.24(A) marking line came out of the app and are being brought back across.
