I only read where it is necessary to provide the operation of rapid shutdown and the system be labeled accordingly, not that it needs a dedicated switch to perform the function.
Glenn -----Original Message----- From: RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mark Frye Sent: Monday, February 02, 2015 4:24 PM To: RE-wrenches Subject: [RE-wrenches] How to isolate the array DC In order to clear up the conversation... I you put a relay in a box within 10 feet of the array on the roof, you can use an relay with a DC rated Normally Open contact to open and connect/isolate the array DC voltage. You can drive the coil of that relay with either AC or DC, but either way, if you lose voltage to drive the coil, the contact opens and isolates. My point is, for simple grid-tied system, there is no need for a "stop" switch anywhere in the system. It doesn't matter whether the contactor coil is driven by the premise AC or by a DC power supply connected to the premise AC, when the the main is opened or the meter pulled, the array Dc will become isolate. Therefore, there is no need for the "stop" switch and yet as I understand it, such a switch is now required by the Code. The switch is not needed but is required. Mark Frye _______________________________________________ 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 _______________________________________________ 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
