Yep, I know the difference and have said twice that we changed out the breakers, and to clarify yes they were brand new. I have seen and got batches of bad breakers, but the one or two times that's happened they came in the same box, ie same batch. These are different amperages. We have done the same troubleshooting rotation with both the old and new breakera- load, no load, wires landed, wires removed, wires exchanged to another breaker in another location- same result. Handles go to full right or left, not trip to center. These are Sq D not the old ITE's or others that you couldnt tell if they'd tripped. I'm about to have them string some SER from the meter to the Panel and see if its somehow the feed wires. PG&E had a recorder on their end, but we haven't put one on yet, should probably do that too.I wonder if he knows the difference? You have a good point, because he doesn't mention changing out any of the circuit breakers. I have experienced the same tripping deal with QO's... they are very sensitive.