Grounding on granite island [RE-wrenches]

[Kent Osterberg]

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In this circumstance he'll never get a great ground.  A metal plate in 
the lake with a long lead going to it probably won't make a very good 
ground either; it's also likely to corrode to the point of being useless 
in a few years.  I think a 20-ft long concrete encased electrode will 
pass inspection, even with shallow soil on solid granite.  A #2 wire 
encircling the building will probably work better, even if there is only 
eight inches of soil, but it won't pass inspection unless it is 
30-inches deep.

==============================================================
Hi gang I an email awhile back about a grounding question, and a 
follow-up phone call today.

This fellow is building a PV/wind/generator system for small cottages on 
a solid granite rock out on Lake Huron. His earth grounding plan is to 
haul a big steel plate out onto the ice (will need to do this pretty 
soon) and let it sink to the lake floor as a way of grounding the system.

Or he may be able to submerge a plate in his graywater pool.

There is no more than 6 inches of earth above the granite on the island. 
He does not have access to the kind of equipment needed to drill deep 
holes in the granite, but he can drill 6 or so inches deep.

His RE dealer has been no help because of the unusual nature of the 
problem, and he has not been able to get help from local electrical 
engineers and electricians for the same reason.

He wants to know if he is doing this correctly, and what size plates to 
use, how many, and anything else you can think of.

You can either respond here if you think it will be of interest to the 
list, or if you need more info and want to carry out an email 
conversation with him, let me know off list and I will get you his email 
address.

Thanks in advance for your help.


------------------------
Michael Welch
Sr. Editor
     Home Power magazine
     www.homepower.com


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