Hi Jason, Always good to get a different view on how to do it. I've always found it easier and cheaper to pull the circuits off the roof to the AC combiner, so my overcurrent is in a different location
Jay Peltz power > On Apr 30, 2014, at 5:08 AM, Jason Szumlanski <ja...@fafcosolar.com> wrote: > > Each microinverter string needs dedicated overcurrent protection. If > combining strings on the roof for a single run back to the interconnection > point, you need each string to have it's own breaker/fuse. The other option > is to run each string back to the interconnection point separately, but for a > 10kW system you have to do a supply side connection anyway on as typical 200A > service, so combining strings somewhere is necessary, and a single run from > the roof makes sense in many cases. > > > Jason Szumlanski > Fafco Solar > > > > >> On Tue, Apr 29, 2014 at 6:40 PM, jay peltz <j...@asis.com> wrote: >> Follow up to Bill's point. >> >> For Micros I've installed a disconnect on the roof, but never a breaker or >> fuse >> Why install a breaker? >> >> jay >> >> peltz power >> >>> On Apr 29, 2014, at 9:43 AM, Bill Hoffer wrote: >>> >>> Dave >>> >>> I agree, in the case of microinverters, you already have a main PV System >>> disconnect at the Load Panel to shut down the system that is readily >>> accesible. I would consider the disconnect on the roof as a supplemental >>> disconnect for the purposes of maintenance by authorized personal that only >>> needs to be accessible. >>> >>> Bill >>> >>> >>>> On Tue, Apr 29, 2014 at 8:44 AM, Dave Click <davecl...@fsec.ucf.edu> wrote: >>>> I think 240.24(A)(4) allows the installation of the inverter OCPDs in the >>>> SolaDeck hidden under a module. >>>> >>>> 240.24 Location in or on Premises. >>>> (A) Accessibility. Overcurrent devices shall be readily accessible and >>>> shall be installed so that the center of the grip of the operating handle >>>> of the switch or circuit breaker, when in its highest position, is not >>>> more than 2.0 m (6 ft 7 in.) above the floor or working platform, unless >>>> one of the following applies: >>>> ... >>>> (4) For overcurrent devices adjacent to utilization equipment that they >>>> supply, access shall be permitted to be by portable means. >>>> >>>> >>>> And if panelboards / fused safety switches are allowed to have >>>> screwed-down covers over the OCPDs, I'd think that installing a removable >>>> module over these OCPDs would meet NEC. I guess an AHJ could argue that >>>> this requires TWO covers be removed, unlike a panelboard or a switch. >>>> >>>> DKC >>>> >>>> >>>>> On 2014/4/29, 11:15, Jason Szumlanski wrote: >>>>> 690.9(D) is not applicable to the original discussion because we were >>>>> talking about an Inverter output circuit, not a PV Source or Output >>>>> circuit. >>>>> >>>>> 690.34 may apply if you call a SolaDeck with breakers a junction box, but >>>>> I can see that being a stretch in the mind of many. >>>>> >>>>> My and Ray's question about the screws on the SolaDeck cover itself >>>>> requiring a tool to render it accessible is still an issue if the >>>>> breakers themselves need to be "readily accessible," but that would also >>>>> apply to a Midnite MNPV, which also has a cover with a screw. >>>>> >>>>> >>>>> Jason Szumlanski >>>>> >>>>>> >>>>>>> On 4/28/2014 5:57 PM, Bill Brooks wrote: >>>>>>> Read 690.9(D) and 690.34. Not sure where this “hysteria—run for the >>>>>>> border” sentiment is coming from. >>>>>>> >>>>>>> >>>>>>> 690.9(D) Photovoltaic Source and Output Circuits. Listed PV >>>>>>> >>>>>>> overcurrent devices shall be required to provide overcurrent >>>>>>> >>>>>>> protection in PV source and output circuits. The overcurrent >>>>>>> >>>>>>> devices shall be accessible but shall not be required to >>>>>>> >>>>>>> be readily accessible. >>>>>>> >>>>>>> >>>>>>> 690.34 Access to Boxes. Junction, pull, and outlet boxes >>>>>>> >>>>>>> located behind modules or panels shall be so installed that >>>>>>> >>>>>>> the wiring contained in them can be rendered accessible >>>>>>> >>>>>>> directly or by displacement of a module(s) or panel(s) secured >>>>>>> >>>>>>> by removable fasteners and connected by a flexible >>>>>>> >>>>>>> wiring system. >>>>>>> >>>>>>> >>>>>>> This is not a change. Please help me understand the concern. >>>>>>> >>>>>>> >>>>>>> Bill Brooks. >>>>>>> >>>>>>> >>>>>>> >>>>>>> From: re-wrenches-boun...@lists.re-wrenches.org >>>>>>> [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Ray >>>>>>> Walters >>>>>>> Sent: Monday, April 28, 2014 2:23 PM >>>>>>> To: RE-wrenches >>>>>>> Subject: Re: [RE-wrenches] (no subject) >>>>>>> >>>>>>> >>>>>>> Interesting so does "require a tool" include taking a screw off the >>>>>>> cover plate of the combiner box, too? >>>>>>> What a game changer. I'm going to Mexico for my next project; I'll >>>>>>> actually enjoy even more being the sole AHJ on the project. >>>>>>> >>>>>>> R.Ray Walters >>>>>>> CTO, Solarray, Inc >>>>>>> Nabcep Certified PV Installer, >>>>>>> Licensed Master Electrician >>>>>>> Solar Design Engineer >>>>>>> 303 505-8760 >>>>>>> On 4/28/2014 2:52 PM, Michael Morningstar wrote: >>>>>>> >>>>>>> Readily accessible is now defined in the 2014 NEC. Installing OCPD’s >>>>>>> underneath a module is a major faux paux, and I can’t imagine any AHJ >>>>>>> thinking otherwise. Having to remove a module in order to reset a >>>>>>> breaker, what a drag. >>>>>>> >>>>>>> >>>>>>> "Capable of being reached quickly for operation, renewal or inspection >>>>>>> without requiring those concerned to use a tool, to climb over, remove >>>>>>> obstacle or other.” >>>>>>> >>>>>>> >>>>>>> Michael >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Apr 28, 2014, at 10:29 AM, William Miller <will...@millersolar.com> >>>>>>> wrote: >>>>>>> >>>>>>> >>>>>>> >>>>>>> You call it a solar panel, I call it a glass j-box cover plate. >>>>>>> >>>>>>> William >>>>>>> >>>>>>> Miller Solar >>>>>>> >>>>>>> >>>>>>> On Apr 28, 2014, at 9:21 AM, Jason Szumlanski <ja...@fafcosolar.com> >>>>>>> wrote: >>>>>>> >>>>>>> If that is the interpretation, >>>>>>> I don't see how the breakers are "readily accessible" in a SolaDeck >>>>>>> mounted anywhere, regardless of whether it is under a module. It >>>>>>> requires removal of four screws (using a tool) to access the breakers >>>>>>> inside the enclosure. It's all up to the AHJ. It has not been an issue >>>>>>> locally here. I can see how other jurisdictions may not >>>>>>> concur. >>>>>>> > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org >
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