Grounding on rock [RE-wrenches]

[Jim Duncan]

Wrenches,
I won't be able to drive a ground rod due to the bedrock being less than 
a foot below the surface. A quick review of the NEC suggested ground 
plates as one option. Calling local supply houses turned up no one with 
such a device. The internet showed a clever ground lattice of rivited 
copper clad metal strips formed in a grid; available from India. 
Another product was a 20 foot long flat roll of copper sheet with a  #6 
copper lead welded to one end and a powdered compound to mix with water 
and pour in the trench to improve conductance. I'd be afraid to ask what 
that costs with the price of copper. 
A 20 foot #2 wire has to be at least 30 inches deep and, short of 
hauling in a truckload of dirt, there isn't 30 inches of dirt anywhere.
What sort of clever ideas have been used to solve this age old dilemma? 
As always, thanks

Jim Duncan
North Texas Renewable Energy Inc
Fort Worth, Texas
ntrei at earthlink.net
817.917.0527


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