The water pipe should already be grounded to the grounding electrode
system. If you connect to that system anywhere, you should be bonded
to metallic water pipes, in a properly constructed electrical system.
At 12:21 AM 1/7/2010, you wrote:
My understanding is that if the water pipe is ferrous metal for a
certain length into the soil - I think 10 or 15 ft. - then it is an
NEC compliant grounding electrode.
Not the easiest thing to confirm on a retrofit. If we can't find an
existing ground-rod we drive one ourselves.
Andrew Truitt
Standard Solar Inc.
Drake Chamberlin
Athens Electric
OH License 44810
CO License 3773
NABCEP TM Certified PV Installer
Office - 740-448-7328
Mobile - 740-856-9648
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