[RE-wrenches] 4 Wire Delta

[August Goers]

We have done many high-leg delta installations with both single phase and
three phase inverters here in the Bay Area.



Besides the normal stinger-leg type issues of trying to install a single
phase 120 volt load across the high leg, I’m not aware of any particular
problems. Certainly we see many existing old services where the high leg
spots are left blank and only two of the three phases are used for branch
circuits. It seems like perhaps this would cause load balancing type issue
with the utility. I’m by no means familiar with the ins and outs of what
causes transformer problems, however.



August

Luminalt



*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Jeff Clearwater
*Sent:* Monday, June 05, 2017 8:19 AM
*To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
*Subject:* Re: [RE-wrenches] 4 Wire Delta



Hi Drake,

Souther Cal Edison allowed us to do a High-Leg Delta - sharing this in the
chance like William that at least you can say others have - can't imagine
what their issue is.

Best,

Jeff

Drake wrote:

Hello Wrenches,

I've recently learned that AEP, our utility company, believes it is unsafe
to backfeed a 4 wire delta transformer. Does anyone know what the issues
are?

Thanks,

Drake

Drake Chamberlin





*Athens Electric LLCOH License 44810CO License 3773NABCEP Certified Solar
PV 740-448-7328*http://athens-electric.com/



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-- 
Jeff Clearwater
Village Power Design
Renewable Energy Design & Installation
Ecovillage Design Consultant

Former NABCEP Certified - 2003-2012
Licensed Solar Contractor in CA - C-46
www.villagepowerdesign.com <http://www.villagepower.com>
413-559-9763
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