Ours does something has to do it Jerry On Feb 2, 2015 11:37 AM, "Glenn Burt" <glenn.b...@glbcc.com> wrote:
> 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 > >
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