<p dir="ltr">Ours does something has to do it<br>
Jerry</p>
<div class="gmail_quote">On Feb 2, 2015 11:37 AM, "Glenn Burt" <<a href="mailto:glenn.burt@glbcc.com">glenn.burt@glbcc.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I only read where it is necessary to provide the operation of rapid shutdown<br>
and the system be labeled accordingly, not that it needs a dedicated switch<br>
to perform the function.<br>
<br>
Glenn<br>
<br>
-----Original Message-----<br>
From: RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] On<br>
Behalf Of Mark Frye<br>
Sent: Monday, February 02, 2015 4:24 PM<br>
To: RE-wrenches<br>
Subject: [RE-wrenches] How to isolate the array DC<br>
<br>
In order to clear up the conversation...<br>
<br>
I you put a relay in a box within 10 feet of the array on the roof, you can<br>
use an relay with a DC rated Normally Open contact to open and<br>
connect/isolate the array DC voltage.<br>
<br>
You can drive the coil of that relay with either AC or DC, but either way,<br>
if you lose voltage to drive the coil, the contact opens and isolates.<br>
<br>
My point is, for simple grid-tied system, there is no need for a "stop"<br>
switch anywhere in the system. It doesn't matter whether the contactor coil<br>
is driven by the premise AC or by a DC power supply connected to the premise<br>
AC, when the the main is opened or the meter pulled, the array Dc will<br>
become isolate.<br>
<br>
Therefore, there is no need for the "stop" switch and yet as I understand<br>
it, such a switch is now required by the Code. The switch is not needed but<br>
is required.<br>
<br>
Mark Frye<br>
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