[SI-LIST] Re: True ground versus local ground ...

True ground is what you draw with chalk on a blackboard.

Fred

----- Original Message ----- 
From: "James Freeman" <freeman@xxxxxxxxxxx>
To: <Raymond.Anderson@xxxxxxx>
Cc: <si-list@xxxxxxxxxxxxx>
Sent: Thursday, September 20, 2001 3:00 PM
Subject: [SI-LIST] Re: True ground versus local ground ...


> 
> Hi All,
>     I would think that any black hole would  do.
> 
> Jim Freeman
> 
> 
> Ray Anderson wrote:
> 
> > True ground is located at Spice Node 0 (about 40 kilometers due south
> > of Alpha Centaura..... :)
> >
> > -Ray
> >
> > >
> > >Obscure interesting topic.
> > >Did my master's on lightning.
> > >
> > >Few places have "true ground".
> > >I've been in a couple places that have had it.
> > >
> > >True ground only occurs when you drill into the water table.
> > >For lightning rods to work the way they're supposed to,
> > >the rod (or it's cable) has to penetrate the local water table.
> > >
> > >One place I was in had the ground rod drilled into the
> > >earth about 350 ft.  The rod was connected to a square
> > >grid of pure copper cable 00, IIRC.  That was called
> > >a "pristine" ground system.
> > >
> > >The Statue of Liberty is another construction which has
> > >true ground.  It's ground rod goes down, I believe,
> > >about 300 feet.
> > >
> > >Local ground can be the ground grid of a building.
> > >Or however you wish to define it.  If you're talking
> > >in terms of say the power grid for California,
> > >"local ground" can take on several meanings.
> > >
> > >Same thing with products.  Just depends on how
> > >you wish to define it.  You can define "true ground"
> > >as primary ground from the mains, then any branched
> > >grounding can be considered "local".
> > >
> > >- Doug McKean
> > >
> > >
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