Ray We understand that free standing ground mounts, pole barns / ( free standing buildings with no one staying or living in them ) equipment sheds etc are exempt from Rapid shut down.
peter ----- Original Message ----- From: Ray To: RE-wrenches ; Rebecca Cantwell Sent: Thursday, August 23, 2018 12:31 AM Subject: [RE-wrenches] Rapid Shutdown Again? Greetings fellow wrenches; I know we have beat this many times but I once again have not been able to resolve the contradictory information in 690 in regards to implementing 690.12. As Rebekah Hren pointed out before, the diagrams shown in Figure 690.1(b) show that the PV System DC Circuit stops at the PV Disconnect. Note 2 says specifically the 'PV Disconnect separates the PV system from all other systems'. But then in the definitions in 690.2 on the next page, the new definition of a PV System DC Circuit says that it includes DC to DC converter output circuits. (which are Solar Edge module level controls, but could be interpreted as a MPPT battery charge Controller?) Then 690.12 which only applies to 'PV System circuits in or on buildings', says we have to control conductors more than 3 ft after penetrating the building. So in my case, I'm looking at a ground mount, and installing an external lockable disconnect on the wall before it goes into the building. This will officially be the PV Disconnect. In my interpretation, I should not need to do any Rapid Shutdown, because I've essentially prevented the PV system from ever entering the building at all ( based on the 5th diagram and Note 2) However, I could see an AHJ claiming I had to do RS all the way to the output side of the charge controller. If this were true, could I simply apply RS equipment from the PV disconnect to the output of the charge controller, or am I back to module level shutdown for my ground mounted array, or could I build a tiny building that just housed the PV Disconnect and take the exemption for 'buildings with the sole purpose of housing PV system equipment'? Essentially the definitions in 690.2 are too broad, and are at odds with the Figure and Notes of 690.1. They really didn't fix this in the 2017 code for us lowly off gridders. Charge controllers are covered by article 706.23 Charge Control, and NOT by 690.12 at all. IMHO, the charge controller needs to be clearly defined and differentiated from DC to DC converters like Solar Edge's module level DC equipment. I just want to go back to doing solar designs and installations, and quit acting like an attorney parsing every word of this confusing code language. -- Ray Walters Remote Solar 303 505-8760 ------------------------------------------------------------------------------ _______________________________________________ List sponsored by Redwood Alliance 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 List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
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