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


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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