[SI-LIST] Re: True ground versus local ground ...
- From: Ray Anderson <Raymond.Anderson@xxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Thu, 20 Sep 2001 12:37:01 -0700 (PDT)
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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