[RE-wrenches] wiring methods between arrays

[Ray Walters]

What would be nifty, is if the chase was at the angle of the roof, so 
that its top edge was level.  Then instead of being a trip hazard it 
could be a step.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 8/14/2015 10:18 AM, Jerry Shafer wrote:
> How ever its done conduit or channel we really need to reduce the trip 
> hazard between sub arrays, It does not matter if its enphase or string 
> inverters keeping the conduit from this hazard should be on the list 
> of "To Do's" also
> Jerry
>
> On Tue, Aug 11, 2015 at 12:19 PM, August Goers <august at luminalt.com 
> <mailto: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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