[RE-wrenches] wiring methods between arrays
Ray Walters
ray at solarray.com
Fri Aug 14 12:17:34 PDT 2015
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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