Re: [CAD_CAM_EDM_DRO] Mill Motor trips GFI outlet

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]
>
> 
>


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