Original poster: Don Murray <don@xxxxxxxxxxxxxxx> Tesla list wrote:
Original poster: DRIEBEN@xxxxxxxxxxxxxxx Chris, That would be (G)round (F)ault (I)nterruptor. All of the newer NSTs must be equipped with this safety feature, according to UL. This feau- ture quickly shuts down the output high voltage if it detects that there is any leakage to ground.
I think the way they work is they continually monitor current on the hot leg and neutral and if they become different, it shuts down.
Don