[SI-LIST] Re: True ground versus local ground ...
- From: James Freeman <freeman@xxxxxxxxxxx>
- To: Raymond.Anderson@xxxxxxx
- Date: Thu, 20 Sep 2001 13:00:22 -0700
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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