[RE-wrenches] wiring methods between arrays

[Andrew Truitt]

I've seen the grounding clamp method a few times:

[image: Inline image 1]

If the clamp is outdoor rated (unlike this one) then I think its an
acceptable method.



For a brighter energy future,


Andrew Truitt

Principal
Truitt Renewable Energy Consulting, LLC

(202) 486-7507

LinkedIn Profile <https://www.linkedin.com/in/andrewtruitt>

Company Website <http://truittreconsulting.weebly.com/>

NABCEP Certified PV Installation Professional ID: 032407-66

Colorado Journeyman Electrician License No.: 600132

<%28202%29%20486-7507>

[image: 24 copy.jpg]

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On Tue, Aug 11, 2015 at 4:19 PM, August Goers <august at luminalt.com> wrote:

> Hi Wrenches,
>
>
>
> I have another best practices questions: what are you doing to run your PV
> wire between arrays on a rooftops? This question has come up on this list
> in the past but I’m still on the hunt for a robust and faster lower cost
> method. We mostly install outdoor boxes on each sub array and then run EMT
> between these boxes. We use strain reliefs to enter the boxes and then
> either keep PV wire or transition to THWN-2 in the EMT depending on the
> layout.  This method takes time and the outdoor boxes aren’t cheap.
> Alternatively, we can run open-ended EMT with ground bushings on the ends
> to bond the conduit. Since ground bushings are designed to be used in boxes
> we switch out the aluminum lug with a tin-coated outdoor rated lug and
> stainless hardware. This technically violates the listing but at least the
> materials hold up. The EMT needs to be carefully bent down at the ends so
> rain doesn’t enter. Lastly, we sometimes run our PV wires along strut or
> angle aluminum (this is the fastest method) which also needs to be bonded
> with a lay-in lug.
>
>
>
> Does anyone have other methods?
>
>
>
> Best,
>
>
>
> August
>
> Luminalt
>
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