Re: Mill Motor trips GFI outlet

I found this from a google search gives some good info regarding GFI and looks like it explains what you are seeing.

http://personal.cha.bellsouth.net/j/o/johngd/files/rv/gfi.pdf

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Roland Jollivet <Roland.Jollivet@...> wrote:
>
> I know the load has nothing to do with the GFI. I understand earth leakage,
> yes.
>
> I'm just countering the notion in posts that it's tripping because of an
> excessive inductive load, but it's only 1/4hp motor, and so it should be
> removed.
>
> Every single item in our house runs through a 63A RCD (30mA) including 300A
> welder, 2kW compressor and lots of other stuff. So if it ever trips, there
> is a problem to rectify, not a CGI to remove.
>
> Regards
> Roland
>
>
> On 7 November 2012 20:24, Gary Click <garyclick@...> wrote:
>
> > **
> >
> >
> > In the case of a GFI, the load downstream has nothing to do with the GFI
> > trip. A
> > GFI is no more likely to trip on a 1HP motor than on a 1/50HP based solely
> > on
> > current draw. The GFI senses the leakage of voltage to ground.
> >
> > Think of youself standing in water (path to ground), holding a drill with
> > a bad
> > cord (no ground pin in the plug) and the drill has an insulation leak
> > (carbon
> > dust from the brushes is bridging from brush holder to frame). What do you
> > expect to happen? Or even more simply, the ground on the outlet is a
> > little
> > dirty. This is when you feel the tingle or "shock" that we have all
> > encounted at
> > some point. The problem is that the difference between a tingle and fatal
> > shock can not be a whole lot.
> >
> > There is a term that everyone has heard, "Electricity takes the shortest
> > path to
> > ground" that is not only incorrect but also dangerous to trust. Actually
> > electricity takes "every path to ground" and when one of those paths is
> > you, not
> > matter how slight the GFI opens in 1/2 cycle or so.
> >
> > The GFI trip is most likely due to the inductive nature of the load, a
> > slight
> > leak to ground or simply the misapplication of the GFI to the device.
> >
> > Seek the advise of an electrician and don't heed the guidance of "shade
> > trees
> > wire benders" including me.
> >
> > gary
> >
> > ________________________________
> > From: Roland Jollivet <Roland.Jollivet@...>
> > To: CAD_CAM_EDM_DRO@yahoogroups.com
> > Sent: Wed, November 7, 2012 11:10:49 AM
> >
> > Subject: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet
> >
> > I don't understand the sentiment to ditch the GFI...
> >
> > I'm by no means a safety freak, buy hey, it's only a 1/4hp DC motor. Think
> > of the load of a fridge, or workshop compressor, and they don't trip the
> > GFI. And if they do, and as in this case, find the reason, and fix that
> > instead.
> >
> > On 7 November 2012 18:31, jeremy youngs <jcyoungs76@...> wrote:
> >
> > > **
> >
> > >
> > >
> > > is it in a wet area? if not pitch the gfi it was never intended to run
> > low
> > > impedance inductive loads. it was meant to keep the wife alive when she
> > > drops the hair dryer in the privvy. i tried once to do the same thing you
> > > are doing and the 25 bucks times 2 in a month led me to replace the gfi
> > > with a standard 15 amp outlet no problems in 8 yrs since
> > > jeremy youngs
> > >
> > >
> > > [Non-text portions of this message have been removed]
> > >
> > >
> > >
> >
> > [Non-text portions of this message have been removed]
> >
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