Chris On 2/2/2015 11:14 AM, Glenn Burt wrote:
Chris, I am not seeing any code reference to AC being affected by 690.12. in fact it seems to specifically address only DC circuits. In Mike Holt's new PV and the NEC book, his note recommends that the rapid shutdown initiator be located near the service equipment, however this is not addressed by the code.-Glenn Burt -----Original Message----- From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Christopher Warfel Sent: Monday, February 02, 2015 10:34 AM To: RE-wrenches Subject: [RE-wrenches] Rapid Shut Down and the 10 Second Rule Questions We have a interpretation problem among some people I work with with, and 690.12 Rapid Shut Down and the the 10 second time for reducing ac and dc conductors to 240ma, and 30V. The word "initiation" seems to indicate that all affected conductors need to be at these levels within 10 seconds of de-energizing either the ac or dc conductors. If so, then the disconnects need to be co-located to meet this requirement if this interpretation is correct. I have read Mr. Brook's article in Solar Pro, but AHJs may feel differently. Would anyone care to weigh in on their interpretation? Thank you, Chris -- Christopher Warfel, President ENTECH Engineering, Inc. PO Box 871, Block Island, RI 02807 401-466-8978 _______________________________________________ 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
-- Christopher Warfel, President ENTECH Engineering, Inc. PO Box 871, Block Island, RI 02807 401-466-8978
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