There is an exception in NEC2011 regarding the point of connection. This may not apply, but you could avoid the supply side. 4500W / 240V = 18.75 x 1.25 = 23.4A, well under the 120% rule. reference 705.12(D)(2)
Jeremy All Solar CO,USA ----- Original Message ----- From: Garrison Riegel To: 'RE-wrenches' Sent: Wednesday, February 27, 2013 2:15 PM Subject: [RE-wrenches] Conductor Sizing for Supply Side Connection Wrenches, On an upcoming job we have a Xantrex XW4548 interconnecting with a 200A service, and I'd very much appreciate some advice if y'all are willing. Since the inverter output OCPD is required to be 60A we are looking at a supply side connection, and I have two questions: 1. Before the point of interconnection the inverter output circuit will first pass through the XW Power Distribution Panel and inverter bypass, which is essentially a 60A breaker. The service disconnect for the supply side connection will also be fused at 60A. Does the 120% rule apply to the conductor between these two OCPDs? Or since this is a supply side connection in accordance with 690.64(A), 690.64(B)(2) will not apply? [this AHJ is on the 2008 NEC] 2. Can anyone recommend a reliable insulation piercing tap connector? Or would you recommend something else entirely for a residential supply side connection? Thanks in advance, Garrison 847-677-0950 Solar Service Inc. ------------------------------------------------------------------------------ _______________________________________________ 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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