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<font size=3>Ray/Jamie:<br><br>
I think that a 3R installation may be superior to a Nema 4. With a
3R any condensation build up can drain.<br><br>
Thanks to all of you for another round of thoughtful, well informed,
technical discussion. This forum is very helpful and I really feel
a lot of camaraderie even though we are interfacing on a text
basis.<br><br>
William Miller<br><br>
<br><br>
At 04:08 PM 10/21/2011, you wrote:<br>
<blockquote type=cite class=cite cite>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: <br>
<blockquote type=cite class=cite cite>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).<br>
<br>
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.<br>
<br>
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><br>
<b>Jamie Johnson<br>
NABCEP Certified PV Technical Sales Professional<br>
NABCEP Certified Solar PV Installer<br><br>
General Manager<br>
SOLAR POWER ELECTRIC<br>
<img src="cid:6.0.1.1.2.20111021162956.038b4ec0@millersolar.com.1" width=226 height=210 alt="988e514.jpg"></b><br>
<br>
<br>
<blockquote type=cite class=cite cite>-------- Original Message
--------<br>
Subject: [RE-wrenches] Wet locations: (was Push-in Wire Connectors)<br>
From: William Miller
<<a href="mailto:william@millersolar.com">william@millersolar.com</a>><br>
Date: Fri, October 21, 2011 10:51 am<br>
To: RE-wrenches
<<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br><br>
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 href="mailto:william@millersolar.com">william@millersolar.com</a><br>
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