I am trying to see how Bussman Fault Current app works by trying to get same number from app frim what's on the print. I have a multi tenant gutter with a 480v 3phase 4wire service and 2- 400a disconnect one before abd one after meter. I am trying to at least come close to what I have on drawings. I just dont know couple values like impedence from xfmr and 50 thhn copper for wire and length. The servixe is parallel 3/0 but I keep getting zero amps on total. What ido you guys think or know I'm doing wrong. My first clue would be I'm trying to use bussan app.