In the immediate term I’d reckon the best option is to put in conduit that can also hold the neutral, unless you get a reply from Fronius.
I’d also be pretty tempted to follow the clear instructions in their manual as well, but definitely curious to see what you hear back from the mfg. If they say you can omit the neutral I’d get it in writing, but I have had an inspector say a letter to that effect (from a different manufacturer, but regarding the same topic) did not override the instructions that were part of the product listing. And the utility may also have an opinion on the matter as well! If you do have to run the neutral perhaps you can get supporting evidence that it is only for voltage sensing and can thus be sized smaller than the phase conductors (no smaller than the EGC) as that is clearly allowed in the NEC®. Brian > On Nov 5, 2024, at 6:47 AM, James Jarvis via RE-wrenches > <[email protected]> wrote: > > > Hi Group, > > We have an install with four Fronius Symo 10.0-3 inverters connected to a > 208V WYE building hundreds of feet away. While the building has a neutral, I > would like to avoid sending the neutral out to the inverters as it is a waste > of materials. More wire, bigger conduit, neutral kits in disconnects, etc. > > The Symo manual indicates that there is a wye grid configuration with three > phase and a neutral. And there is a delta configuration with three phase > only. Both appear as though they can be set to 208V > > <image.png> > > > > I can't see any reason why I can't program the inverters at Delta and not > have a neutral. Am I missing anything? I tried inquiring with Fronius, but > it's a process and the conduit has to go into the ground today. > > Thanks wrenches! > > > -James Jefferson Jarvis > APRS World, LLC > +1-507-454-2727 > http://www.aprsworld.com/ > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org >
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