Grounding a remote PV array, was inverter location, ground loops [RE-wrenches]

[Kent Osterberg]

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Bill,

Small potentials are all that is needed to either cause or prevent
electrolysis.

In regards to grounding a remote PV array my point is that to comply
with both 2005 NEC 250.32 and 250.164, it is necessary to run an
equipment grounding conductor to the PV array and connect the ground per
250.32(B)(1).  Grounding the PV negative at two locations, per
250.32(b)(2), violates 250.164.  Since 250.164 is specifically about
grounding DC systems it has precedence on this issue.

An additional bond, bare copper buried outside any conduit, between the
two grounding systems is a good idea and will improve lightning
protection; but is not required.  Take a look at the NEC handbook
regarding 250.32.

Kent Osterberg, PE
Blue Mountain Energy, LLC


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