What makes you say that?Guys please. There is no one physically turning the breaker off.
I agree with many of the other posters here: Eliminate the human variable. You're still checking electrical things despite all your electrical tests coming up negative, and unless you've physically watched it turn itself off, there's a huge possibility a disgruntled employee is doing this.
You've done your due diligence testing all the electrical possibilities:
- You've ruled out defective breaker by replacing it.
- You've ruled out overcurrent with your power recorder.
- You've checked for wiring faults with a megger.
- The only thing you haven't done is look for hot-spots with IR, but there's nothing to suggest it might be necessary.
If the breaker is turning completely off and the OEM says that the breaker ain't designed to do that without human intervention, well....