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 > > >------------------------------------------------------------------ >To unsubscribe from si-list: >si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field > >or to administer your membership from a web page, go to: >//www.freelists.org/webpage/si-list > >For help: >si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field > >List archives are viewable at: > //www.freelists.org/archives/si-list >or at our remote archives: > http://groups.yahoo.com/group/si-list/messages >Old (prior to June 6, 2001) list archives are viewable at: > http://www.qsl.net/wb6tpu > > ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu