[SI-LIST] Re: Fwd: Should the signals always return back through GND
- From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 22 Aug 2005 12:33:35 -0400
> Roy, Dr. Archambeault traced "ground" back to telegraphy when the earth
> was
> used as the return conductor.
"Ground" is also a return conductor for AC power distribution on "telephone"
poles. Most of the current is supposed to be in the neutral wire, but that
wire is "earthed" in multiple places, so some of the current also goes via
the higher resistance earth path. You can sometimes measure significant
voltages between points in the earth as a result.
And current will flow to earth if there is a fault condition. That's where
GFI protectors are helpful.
Regards,
Andy
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