Plasma cutter!

Found a great deal on a little pilot arc lotos LTP5000d plasma cutter, $399!  Just arrived and got it all hooked up and made a few practice cuts. My 20amp breaker at home was tripping on the gfci- maybe the surge when creating the arc?  Works fine off the 20amp on my generator though.  Will continue to tinker on using household power to avoid annoying the neighbors.