Whoops, hit send a little early there... In the 2014 NEC, 690.35(B) states that overcurrent protection for ungrounded PV power systems must be installed in accordance with 690.9. 690.9(E) states that an overcurrent protection device must be installed on each ungrounded conductor, i.e. both the positive and negative in ungrounded PV power sources. 690.16(A) and (B) state that disconnecting means be provided to for fuses energized on both sides (i.e. from parallel connected PV source circuits or PV output circuits).
So along with 690.13, it is pretty clear that disconnects and overcurrent protection are required on both ungrounded circuit conductors. Now whether or not that'll always be the case in the future is a different story. Brian Mehalic NABCEP Certified Solar PV Installation Professional™ R031508-59 PV Curriculum Developer and Instructor Solar Energy International http://www.solarenergy.org On Sun, Mar 22, 2015 at 5:58 PM, Brian Mehalic <[email protected]> wrote: > In the 2014 NEC, 690.35(B) states that overcurrent protection for > ungrounded PV power systems must be installed in accordance with 690.9. > 690.9(E) states that an overcurrent protection device must be installed on > each ungrounded conductor, i.e. both the positive and negative in > ungrounded PV power sources. > > Also note 240.15, which also requires overcurrent protection in series > with all ungrounded conductors. > > Cheers, > > > Brian Mehalic > NABCEP Certified Solar PV Installation Professional™ R031508-59 > > PV Curriculum Developer and Instructor > Solar Energy International > http://www.solarenergy.org > > On Sun, Mar 22, 2015 at 11:28 AM, AE Solar <[email protected]> > wrote: > >> Hey Wrenchers, >> Can someone point me towards where the code references the need to >> disconnect both conductors in an install with transformerless/ungrounded >> inverters? Thanks >> Adam >> >> Adam Katzman >> Autonomous Energies >> 4872 State Route 9G >> Germantown NY, 12526 >> www.autonomousenergies.com >> (518) 567-1468 >> >> >> _______________________________________________ >> 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 >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/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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