Does anybody know if using the HF ground terminal on the PP256 would cause any issues with a GFI breaker? I'd think that for it to be able to affect the HF noise coming from the machine, there would have to be something flowing through that lead, (whereas normal ground is a safety path that shouldn't normally carry any current). I'm also not sure if the GFI breaker would be sensitive to current flow at that high a frequency anyway. It would be unfortunate if using the HF ground would cause the breaker to constantly trip.