Yes and no, I think this is a tap, "a tap shall be permitted anywhere along a feeder" ' as long as it is less than a 10-foot rule or 25-foot rule ending in a listed OCPD with a rating sufficient to handle the maximum overcurrent'. Service equipment residential is rated for fault currents of up to 10,000 amps withstand. Refer to 240.4.B and 240.21 (B) (1 & 2)
On Sun, Apr 17, 2022 at 10:39 AM Jason Szumlanski via RE-wrenches < [email protected]> wrote: > But this isn't a tap. It's a feeder conductor connected to an OCPD. > > I guess if you don't have a grid in or generator in or AC Coupled PV, you > could just call it an inverter output circuit and it could be sized > accordingly. But it would still need to be protected at it's source by an > appropriately rated OCPD. Don't get me wrong... I don't think there is a > real safety issue here, but I also don't see how the NEC allows the > conductor to be sized for anything less than 200A. > > Jason > > > On Sun, Apr 17, 2022, 11:29 AM Darryl Thayer via RE-wrenches < > [email protected]> wrote: > >> 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 < >> [email protected]> 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 < >>> [email protected]> 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 < >>>> [email protected]> 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 < >>>>> [email protected]> 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 < >>>>>> [email protected]> 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 < >>>>>>> [email protected]> 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 < >>>>>>>> [email protected]> 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: [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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