Patio wrote: ↑
Tue Apr 30, 2019 10:48 pm
Liveaboard, you friend is very lucky. The leakage in the drill press, had a high enough resistance that your friend may have felt nothing. I would also have questioned whether the unit was grounded.
If it was grounded, the GFI would always trip.
My friend died from a non-machine related issue, but that 380V 3-phase drill press is still in use.
Actually, I used it extensively myself in the past; never felt a thing.
Euro GFI's are usually (I think) 20mA*, but higher tolerances are available; people usually fit them to circuits that run old machines.
I've had a few zaps in my life; actually it's my earliest memory.
One time I was stuck to a 220V wire by a finger, earthed through bare feet on a dry floor.
I pulled the fitting off the wall to get free; there was a hole burned deep into my fingertip. That was pre-GFI days.
Remembering to shut off the power before working on the wiring is good practice.
Standard ones are 4mA, 20mA are what people use to avoid replacing old machines that they should really replace.