Small Clarification: Grounding a remote PV array, was inverter location, gro

Jim Easton jeaston at ucsd.edu
Thu Jul 19 23:07:32 PDT 2007


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Notwithstanding what Kent has said (below), the PV neutral conductor should 
not be connected to ground at both the array and at the inverter.

Jim Easton, PE
 (E 11974)
4364 Bonita Road, No. 166
Bonita, CA 91902-1421
Tel: 858-527-0240
Fax: 619-470-8616
----- Original Message ----- 
From: "Kent Osterberg" <kent at coveoregon.com>
To: "Wrenches" <RE-wrenches at topica.com>
Sent: Thursday, July 19, 2007 12:05 PM
Subject: [SPAM] Grounding a remote PV array, was inverter location, ground 
loops [RE-wrenches]


>
> 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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>
>
> 


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