350 feet to barn- grounding [RE-wrenches]

[Dick Ratico]

Hi Steve,

The first paragraph of NEC 690.43 is unequivocal in requiring an equipment
grounding conductor between the array and other equipment. In my opinion, any
inspector, grumpy, euphoric, or anything in between, cannot interpret it
otherwise.

As Ray points out, he may permit it to be direct buried in the trench outside
the conduit, rather than inside. He may even permit it to be direct buried on
the opposite side of the trench from the conduit. There was a thread here, in
the middle of this month, which discussed this.

Dick Ratico
Solarwind Electric
Bradford, VT 

You 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.


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