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I started using the wet rated wire nuts, because I've found some
corrosion in old connectors in outdoor boxes. BTW, why don't you
like the goo filled wire nuts? They seem a decent and cost effective
solution.<br>
I agree with your idea that condensation and moisture buildup can
occur even in a NEMA 4 box, and the issue that I have is that
breakers and fuse holders in combiner boxes are definitely not wet
rated. I wonder what happens to the internal workings of a breaker
after decades in an outdoor box, but considering there are an awful
lot of them around (at least AC) I guess I'll get another night's
sleep in our less than perfect world of PV wiring.<br>
<br>
Ray<br>
<br>
On 10/21/2011 9:05 AM, Jamie Johnson wrote:
<blockquote
cite="mid:20111021080507.cbd8bec484907cf1a9d3a5fb1ad0b5d1.fa84f31d96.wbe@email03.secureserver.net"
type="cite"><span style="font-family:Verdana; color:#000000;
font-size:10pt;">
<div>William, the only explanation that I have found for using
THWN-2 in conduit run through the attic is that during the day
as the temperature in the attic increases, the air in the
conduit expands, at night the opposite effect happens, the
temperature in the attic decreases and the volume of air in
the conduit contracts with the potential to bring in what ever
climate conditions exist outside the conduit (In FL this could
be humid air).</div>
<div> </div>
<div>Over time if there is humid air present, this could form
condensation in the conduit or NEMA 4 rated enclosure, hence
the need for wire and connections rated for a wet location.</div>
<div> </div>
<div>I have seen photos at inspectors meetings of NEMA 4
enclosures and conduit that contained water although I am not
sure how often this would normally happen.<br>
</div>
<div><br>
</div>
<div><span style="FONT-SIZE: 8pt"><span style="COLOR: #3366ff"><strong><span
style="COLOR: #0000ff">Jamie Johnson<br>
NABCEP Certified PV Technical Sales Professional<br>
NABCEP Certified Solar PV Installer<br>
<br>
General Manager</span></strong></span></span></div>
<div><span style="FONT-SIZE: 8pt"><span style="COLOR: #3366ff"><strong><span
style="COLOR: #0000ff">SOLAR POWER ELECTRIC</span></strong></span></span></div>
<div><span style="FONT-SIZE: 8pt"><span style="COLOR: #3366ff"><strong></strong></span></span></div>
<div><span style="FONT-SIZE: 8pt"><span style="COLOR: #3366ff"><strong><span
style="COLOR: #0000ff"><img title="signature image"
alt=""
src="cid:part1.09030106.00020307@solarray.com"
border="0"></span></strong></span></span></div>
<div> </div>
<div> </div>
<blockquote style="BORDER-LEFT: blue 2px solid; PADDING-LEFT:
8px; FONT-FAMILY: verdana; COLOR: black; MARGIN-LEFT: 8px;
FONT-SIZE: 10pt" id="replyBlockquote" webmail="1">
<div id="wmQuoteWrapper">-------- Original Message --------<br>
Subject: [RE-wrenches] Wet locations: (was Push-in Wire
Connectors)<br>
From: William Miller <<a moz-do-not-send="true"
href="mailto:william@millersolar.com">william@millersolar.com</a>><br>
Date: Fri, October 21, 2011 10:51 am<br>
To: RE-wrenches <<a moz-do-not-send="true"
href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
<br>
<x-sigsep>
<p><font size="3">Friends:<br>
<br>
I have had plan checkers insist I use wet rated wire
on rooftops even though the wire was in either liquid
tight or EMT with raintight connectors. I did not
need to dispute this because we had specified THHN
wire that is also rated THWN for wet locations. This
discussion makes me think I should have contradicted
the requirement because I am not sure wet rated wire
is required inside dry conduit. I will be looking
this up.<br>
<br>
I feel that you should not let an AHJ impose a
requirement that is not in the code because then you
become bound to the new stricture. I realize that an
AHJ can impose stricter requirements, but I insist
that it be in writing, required in advance of the job
in question and that it be required universally.
Otherwise, it's anarchy.<br>
<br>
William Miller<br>
<br>
<br>
Miller Solar<br>
Voice :805-438-5600<br>
email: <a moz-do-not-send="true"
href="mailto:william@millersolar.com">william@millersolar.com</a><br>
<a moz-do-not-send="true"
href="http://millersolar.com/" target="_blank"
eudora="autourl">http://millersolar.com<br>
</a>License No. C-10-773985<br>
</font>
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