Answers to your questions/comments: 1. The same voltage in the panelboard would also apply to the junction box in which it would be located (as suggested by Enphase). You have to bring a 240V 3-wire circuit to the Envoy in its enclosure. I don't see the difference. 2. Enphase's IQ combiner is only good for 52 IQ7+ micros. These systems are much larger. 3.Yes. Tested. Successful. 4.There isn't quite *that* much extra room, but ample room for the Envoy on a DIN rail. 5. I ma hesitant as well. Absent some good answers from Enphase, it's a tough call because I don't consider their documented solution compliant given that you can't ground the DIN rail they provide.
<https://mailtrack.io/trace/link/cd7ee5b8f72f9150cba39549b618d038dca6f767?url=http%3A%2F%2Fwww.floridasolardesigngroup.com%2F&userId=1613865&signature=a4cdfea4a151220f> *Jason Szumlanski* Principal Solar Designer | Florida Solar Design Group (239) 491-8010 (239) 410-4985 www.FloridaSolarDesignGroup.com <https://mailtrack.io/trace/link/c677689c3f678ffaffc928248903416b6527e0d4?url=http%3A%2F%2Fwww.FloridaSolarDesignGroup.com&userId=1613865&signature=51d821586fb66e26> [image: Facebook] <https://mailtrack.io/trace/link/f25733ecf11782bdea1c7a9b0b578bbd7b7e645d?url=https%3A%2F%2Fwww.facebook.com%2Ffloridasolardesigngroup&userId=1613865&signature=b9bf743399157a4f> [image: Twitter] <https://mailtrack.io/trace/link/9db60e6983ff51be3465543c64d70f5ac39b5392?url=https%3A%2F%2Ftwitter.com%2FFloridaSolarDG&userId=1613865&signature=f0f6684ccf90f946> [image: Youtube] <https://mailtrack.io/trace/link/7e09bbb712d3ed6735c5bf2febabb0569a23e382?url=https%3A%2F%2Fwww.youtube.com%2Fchannel%2FUCjnsYt5r7DNJD3ZnqI10j8g&userId=1613865&signature=6873b4330fbe90e3> On Fri, Oct 2, 2020 at 4:07 AM William Miller <[email protected]> wrote: > Jason: > > > > Several issues come to mind: > > > > 1. I think the question that dictates is the insulation rating of the > Envoy and associated wiring as possibly exposed to voltages within the > panelboard. This is akin, but not identical, to the scenario described in > NEC 300.3(C). Insulation rating matters if any low voltage equipment could > in any odd-ball scenario contact an energized part. I don’t imagine the > Envoy assembly has an insulation rating. The insulation rating must also > apply to any communications, CT or any other purposed conductors associated > the Envoy. Indeed, this is the same problem regularly encountered when > installing energy monitor equipment, such as E-gauge or similar, in panels. > > 2. If there are any power line communications interference problems, > you want your Enphase branch circuits to land in a separate sub-panel so > you can apply filtering if needed. The Envoy must be connected to that > sub-panel. Enphase makes some custom combiners for this specific purpose. > Any reason you are not using a sub-panel or Enphase combiner to collect > Enphase circuits? > > 3. If the Envoy is in a metal can will the Wi-Fi work? > > 4. If there is so much room, would you consider mounting an enclosure > in the panel inside of which the Envoy could be mounted? A PVC pull box, > as one option, would not diminish the Wi-Fi signal any more than it already > is and would provide the insulation needed to keep energized parts away > from the low voltage equipment that is the Envoy. I have even bent up some > galvanized sheet metal partitions to install in breaker panels. If well > fabricated and bonded, this has made me feel warm and fuzzy about the > safety of same. > > 5. Based on the above, I would not put a naked Envoy in a breaker panel > unless it was my own house. > > > > I hope these musings help you decide on a design strategy that you and the > AHJ think is safe and legal. > > > > Sincerely, > > > > William Miller > > Miller Solar > > 17395 Oak Road, Atascadero, CA 93422 > > 805-438-5600 > > www.millersolar.com > <https://mailtrack.io/trace/link/5dd283a39fd90538d788acedda94c8e99c05b474?url=http%3A%2F%2Fwww.millersolar.com%2F&userId=1613865&signature=f5aaf0e548f4604a> > > CA Lic. 773985 > > > > > > *From:* RE-wrenches [mailto:[email protected]] *On > Behalf Of *Jason Szumlanski > *Sent:* Thursday, October 1, 2020 2:00 PM > *To:* RE-wrenches > *Subject:* [RE-wrenches] Enphase Envoy Enclosures > > > > Can anyone point to any code issues with mounting an Envoy inside of a > panelboard? For example, when installing a 3-phase commercial system with a > large 400A AC combiner panelboard, there is often PLENTY of room to mount > an Envoy inside on a DIN rail. Aside from the manufacturer's instructions > not specifically listing this option, I can't see any reason that it would > be prohibited. The only downside I can see would be slightly more difficult > access to service buttons. > > > > I would argue that it is better. The DIN rail would be bonded to the > enclosure. The DIN rail that Enphase ships with the Envoy is too short to > accept a DIN mounted grounding terminal. When mounting in a non-metallic > enclosure I run an EGC to a grounding terminal on a longer DIN rail that I > install, not the included one. I'm wondering how people handle the lack of > a ground terminal on the Envoy and whether they even run an EGC along with > the circuit conductors when mounting an Envoy in a non-metallic enclosure. > I have not been able to get a good answer from Enphase on how they expect > this to be accomplished. I suppose if the Envoy does not need an equipment > ground because it is insulated, and the DIN rail is not exposed once the > Envoy is mounted. Maybe it is their opinion that no EGC is required, but I > see the DIN rail as needing an EGC. > > > > Anyway, that's a lengthy side note. I'm mainly wondering if the Envoy can > be mounted in a panelboard. > > > > > > > > Jason Szumlanski > > > > _______________________________________________ > 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 > <https://mailtrack.io/trace/link/6004e2c9f3aa5c290f013353a35c2fd14aedb81b?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=982167804d1de11d> > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > <https://mailtrack.io/trace/link/e8f908e284f0c692ed4e3e8cfa8f90407e5217ef?url=http%3A%2F%2Flists.re-wrenches.org%2Fpipermail%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=d3e09c9e28cb3289> > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > <https://mailtrack.io/trace/link/fceb12d4143fa2095259475c2b27adc623615ad1?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=81b751c7b05c4f71> > > Check out or update participant bios: > http://www.members.re-wrenches.org > <https://mailtrack.io/trace/link/c726fa22ff2d42404f9f41b0e3207f82c2b64b44?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=e8ac6c385feba8de> > >
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