350 feet to barn- grounding [RE-wrenches]

[Ray Walters]

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Steve;

For lightning protection purposes, you're right. It would be better  
to not connect the grounding systems. For grouchy inspectors though,  
I think you'll need that ground wire. You may be able to run a bare  
copper conductor outside the conduit, which would help reduce your  
impedance to ground.
If it helps....Article 690 is more confusing than ever regarding  
ground requirements. Get the 2008 NEC Handbook with illustrations,  
and try to make sense out of it all: you and the inspector will be  
crying in no time....
Have some tissues and donuts on hand, and he may just walk away  
without giving you a hard time.

Ray Walters


On Jun 29, 2008, at 3:34 PM, Steve Johnson wrote:

>
> I have a grid tied installation where the panels are 350 ft. from the
> inverter.  This is not a voltage drop problem because I have 370  
> Vmp DC
> to work with so wire is sized < 1% Vd.
>
> Is there any reason to run a ground wire from the barn to the house in
> the underground conduit?  I can't think of one.  The 4 strings on the
> barn will be combined at the barn, with a lightning arrestor and  
> ground
> rod installed.
>
> At the house the DC disconnect will be grounded on the AC and DC side.
> This seems fine to me but there is a gnawing subconcious feeling that
> makes me ask this question.  Or maybe its the grouchy inspector.
>
> Steve
>
>
>


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