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:[email protected]] *On Behalf Of *Jeff Clearwater *Sent:* Monday, June 05, 2017 8:19 AM *To:* RE-wrenches <[email protected]> *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/ [image: Image removed by sender.] <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=link> _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org -- 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
_______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
