350 feet to barn- grounding [RE-wrenches]

[Steve Johnson]

Ok already, I put it back in.  I did reduce the ground size, from what I 
had, as per 690.45 A (Increases in equipment grounding conductor size to 
address voltage drop considerations shall not be required.)



Joel Davidson wrote:
> 
> You will get better lightning protection if you connect the array and 
> house 
> panel and any other grounds together and also put a ground rod on the 
> same 
> grounding conductor at the array to minimize the potential between the 
> array 
> and the house panel. The mindset to have is all electrical and chassis 
> grounds should have the same minimum resistance and all ground tied 
> together. Copper conductors and ground rounds are still the lowest cost 
> and 
> best lightning and grounding protection.
> 
> ----- Original Message ----- 
> From: "Ray Walters" <walters at taosnet.com>
> To: <RE-wrenches at topica.com>
> Sent: Sunday, June 29, 2008 3:18 PM
> Subject: Re: 350 feet to barn- grounding [RE-wrenches]
> 
> 
> >
> > 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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> > 
> 



Steve Johnson
LightWave Solar Electric
Nashville, Tennessee


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