The tap rule says you can reduce to 10% of the nominal size for 10 feet and protect at the downstream OCPD or 25% for 25 feet for solar with multiple sources see 705
On Sat, Apr 16, 2022 at 9:16 PM Jason Szumlanski via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > That's what I'm thinking. You would need to use a 200A conductor to a > separate load out OCPD before downsizing the wire. I guess there are pros > and cons, but it seems this is geared toward whole house backup for 200A > services. I'm eager to get an opportunity to use it in that scenario. > > Jason > > > > > On Sat, Apr 16, 2022, 10:06 PM Chris Sparadeo via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Jason, >> >> Any additional OCPD downstream of the 200A load output breaker could >> allow for a smaller wire size to be used at these terminals. For example, >> load output conductors run to a 100A main breaker panel board. Obviously >> depending on circumstances, a #4 copper could fit the bill. >> >> What I’m not extremely excited about with the new design is that in an >> off-grid scenario with a generator and smart load, we would now need to >> integrate an AC disconnect for generator input (grid) and either a fused >> disconnect or loads panel for any smart load output. With the 12K unit, the >> integrated breakers help cut down on BOS and install time. >> >> -Chris >> >> On Sat, Apr 16, 2022 at 5:35 PM Darryl Thayer via RE-wrenches < >> re-wrenches@lists.re-wrenches.org> wrote: >> >>> Hello, The overcurrent device is to protect the conductors. you can put >>> any size wire, but you must protect with the overcurrent device. REmember >>> in solar equipment; you may have more than one supply source. The DC best >>> example is solar modules connected in parallel, on >>> >>> On Fri, Apr 15, 2022 at 8:26 PM Jerry Shafer via RE-wrenches < >>> re-wrenches@lists.re-wrenches.org> wrote: >>> >>>> You must meet all expected source output potentials within the design >>>> and operating limits, as long as the distribution panel and connected >>>> wiring is rated for the max output of the protected source then you are >>>> good. A 200 ATS connected to a 10 kW genny does not require 2/0 as it will >>>> never meet that rating. Just remember its whatever the max output can be >>>> plus your margin. >>>> >>>> On Fri, Apr 15, 2022, 5:44 PM Chris Sparadeo via RE-wrenches < >>>> re-wrenches@lists.re-wrenches.org> wrote: >>>> >>>>> Hi Jason, >>>>> >>>>> You bring up a valid point….in an off-grid scenario with the 15k do >>>>> you size the conductors to the continuous capacity, surge capacity or the >>>>> OCPD of the unit? >>>>> >>>>> -Chris >>>>> >>>>> On Fri, Apr 15, 2022 at 4:01 PM Jason Szumlanski via RE-wrenches < >>>>> re-wrenches@lists.re-wrenches.org> wrote: >>>>> >>>>>> P.S. ICYMI, this inverter has a massive combined AC coupled and DC >>>>>> coupled capacity. They allow 15kWdc plus 19.2kWac!!! Impressive. >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> On Fri, Apr 15, 2022 at 10:59 AM Jason Szumlanski < >>>>>> ja...@floridasolardesigngroup.com> wrote: >>>>>> >>>>>>> I'm not following the wiring diagrams for this new inverter. It has >>>>>>> 200A pass-through capability with an integrated 200A load disconnect. >>>>>>> But >>>>>>> then it says the wire gauge for the load out wiring can be #4 to 2/0. >>>>>>> >>>>>>> In an off-grid scenario where there is no generator, the max >>>>>>> continuous output is 62.5A, so I assume 80A circuit protection could be >>>>>>> used with 80A rated wire (#4), but how is that circuit protection >>>>>>> implemented if the 200A breaker is integrated? Do you have to run a >>>>>>> short >>>>>>> piece of 2/0 to an external 80A rated OCPD and then step down to #4? >>>>>>> >>>>>>> Jason Szumlanski >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>> >>>>> >> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: RE-wrenches@lists.re-wrenches.org > > 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/re-wrenches@lists.re-wrenches.org/ > 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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