Hi Ray, I'm curious to know why you think that metallic conduit is required for the inverter AC output. 690.31(E) specifically addresses DC source and output circuits.
We have an AHJ who interprets the section the same as you and I've been working to turn him (as he's now responsible for training other inspectors on PV in our Region). Toward that goal I asked John Wiles for his input. He said: " The intent of 690.31(E) is to apply only to the always-energized DC circuits and not to the ac output circuits from the inverter since they go "dead" as soon as the circuit to the utility is opened at any point. There was a typo in 690.31(E) in the 2008 NEC. The word "of" should have been "to" in front of the word "inverter". The typo occurred in the original submission (by me) to the Code Making Panel. The typo was not detected during the review process. The word "PV" modifies both "source" and "output" . The attached proposal is being submitted for the 2011 NEC that will make corrections and expansions to 690.31(E)." I'd be interested to know if other wrenches are being subject to the same interpretation (i.e. inverter AC must be in metal). -Kelly Kelly Keilwitz, P.E. Whidbey Sun & Wind, LLC Renewable Energy Systems NABCEP Certified PV Installer 987 Wanamaker Rd, Coupeville, WA 98239 PH & FAX 360-678-7131 [EMAIL PROTECTED] On 10/24/08 10:31 AM, "R. Walters" <[EMAIL PROTECTED]> wrote: > > You run AC wiring right to the AC disconnect from the roof. You still have to > comply with 690.31E, (steel conduit to the disconnect is required for both DC > or inverter output to the first readily accessible disconnect)) but you only > need a single AC disconnect. No combiner box, No accessible DC disconnect. > > > Ray Walters > > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & 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
