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</head><body style="color: rgb(0, 0, 0);" text="#000000">Hey Brad and
All, <br>
<br>
We've been switching (pun intended:)) from SQ D HU361s to <a
href="https://www.imopc.com/products/10000000">IMO DC Isolators</a><br>
with good results. They make 2,3,4,5,6,8 pole units and that lends
itself well to actually switching both poles at reasonable cost.<br>
<br>
As for the RSS discussion. I'm hearing some others imply that if "any"
DC circuits from a ground mount are on or in a building that the whole
array needs RSS? I don't believe that's what the code intends at all
and is certainly uncalled for from any safety standpoint.<br>
<br>
We've had many inspectors okay a simple PV Disconnect on the DC side of a
ground mount - either on the house or even at the array - as the RSS
for DC lines if they do then enter a building - so simply putting an RSS
sticker on the DC PV disconnect before it enters the building - end of
story.<span> That's our common practice on ground mounts.<br>
<br>
Hope that helps!<br>
<br>
Best,<br>
<br>
Jeff<br>
<br>
<br>
<br>
<br>
</span>
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<a style="color:#485664
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Bassett</a></div> <div
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">February
1, 2022 at 2:14 PM</span></font></div> </div></div>
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<meta http-equiv="content-type" content="text/html; charset=utf-8"><div
dir="ltr"><div>"A switch, outside of the building, <span
style="color:rgb(0,0,0)">opening the PV circuit to the power
electronics, and </span>functioning as the pv system disco and the rapid
shutdown initiation device, should be all that is required."</div><div><br></div>That
is what I have found most inspectors will accept, but not all. A
strict reading of the code does come to the same conclusion that William
comes to, and some inspectors will require that. The code is not very
specific on where the PV system disconnect should go. It seems to be
mostly accepted to be on the PV side of the charge control, but when I
read the code strictly it seems to me it should be on the battery side
of the charge control since it is only a PV device. Fortunately the PV
side is more accepted because that makes things much easier. <div><br></div><div>What
I'm still having trouble with is the requirement for breaking both pos
and neg legs in the PV system disconnect unless solidly grounded which
most systems are not (690.13(E)). I see that most installers do not
break both poles, but only the positive leg, which is of course easier
and less expensive. I've quoted the use of dual pole breakers when
possible, but OutBack does not really call for that always, and if you
ask about their 2 pole 300V breakers they (and Carling) don't say they
can be used that way. And if you do, you have to run the wires in
opposite directions for polarity. I've asked for clarification but have
not received it yet. Then there are the high voltage charge controls
like Schneider, where often one uses the SqD HU361, which can be wired
in various ways to meet the 600V requirement. It can be wired one pole
for up to 18A Isc for PV, or up to 30A if two poles in series, or one
pos and one neg pole in the circuit. The Schneider RS Disco does break
both poles, one of the few devices that make it clear. I'm curious what
others are doing.</div><div><br></div><div>Brad</div></div><br>
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<a style="color:#485664
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Mehalic</a></div> <div
style="display:inline-block;white-space:nowrap;vertical-align:middle;width:48%;text-align:
right;"> <font color="#909AA4"><span style="padding-left:6px">February
1, 2022 at 11:23 AM</span></font></div> </div></div>
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style="color:#909AA4;margin-left:24px;margin-right:24px;"><meta
http-equiv="content-type" content="text/html; charset=utf-8">Sorry,
forgot to state my previous comment was in regards to a ground-mount. <br><br><div
dir="ltr">Brian</div><div dir="ltr"><br></div>
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--></style><div class="WordSection1"><p class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#003300">Ray:</span></p><p
class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#003300"> </span></p><p
class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#003300">Thanks
for that input. I was hoping I was wrong. I looked for that
discussion in the archives but could not find it.</span></p><p
class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#003300"> </span></p><p
class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#003300">William</span></p><p
class="MsoNormal"><span
style="font-family:"Verdana","sans-serif";color:#003300"> </span></p><div><p
class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#003300">Miller
Solar</span></p><p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#003300">17395
Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#003300">805-438-5600</span></p><p
class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#003300"><a
href="http://www.millersolar.com/" moz-do-not-send="true">www.millersolar.com</a></span></p><p
class="MsoNormal"><span
style="font-family:"Arial","sans-serif";color:#003300">CA
Lic. 773985</span></p><p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#003300"> </span></p></div><p
class="MsoNormal"><span
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style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in
0in"><p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
RE-wrenches [mailto:<a
href="mailto:re-wrenches-bounces@lists.re-wrenches.org"
moz-do-not-send="true">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>Ray<br><b>Sent:</b> Tuesday, February 1, 2022 10:11 AM<br><b>To:</b>
<a href="mailto:re-wrenches@lists.re-wrenches.org"
moz-do-not-send="true">re-wrenches@lists.re-wrenches.org</a><br><b>Subject:</b>
Re: [RE-wrenches] Rapid Shutdown for Off-grid systems</span></p></div></div><p
class="MsoNormal"> </p><p> Ground mounts do NOT require RSS. We hashed
this out years ago on the Wrenches list, when NEC 2017 came out.</p><p>See
Figure 690.1(B) Note (2): <i>" The PV system disconnect in these
diagrams separates the PV system from all other systems".</i></p><p>Thus,
the PV disconnect is defined as the transition point from the PV system
to all other systems, like battery or inverter systems. The installer/
designer decides where to put that disconnect. I usually put it on the
wall before it goes into the building, and I have never had an inspector
question that. </p><p>Thanks,</p><div>Ray Walters</div><div>Remote
Solar</div><div>303 505-8760</div><div><p class="MsoNormal">On 2/1/22
10:06 AM, William Miller wrote:</p></div></div>
<br><fieldset class="mimeAttachmentHeader"></fieldset><br><div>_______________________________________________<br>List
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