Carflex revisited [RE-wrenches]

[Bill Brooks]

Travis,

Water can get in directly through rain, or by condensation and getting
trapped. Of course, when you get water in a junction box, the wet rating of
the conduit is the least of your worries.

The point about 90C wire is correct on the end connected to the 75C terminal
block or overcurrent device. However, when looking at the ampacity at the PV
module, you are to use the temperature rating of the terminal block in the
PV module (now some manufacturers use 90C terminal blocks or higher in their
modules) on that end. The ampacity of your overcurrent protection must be at
least as low as the lower of the two end values and no more than the max
series fuse rating of the module.

-----Original Message-----
From: Travis Creswell, Ozark Solar [mailto:ozsolar at ipa.net]
Sent: Monday, May 28, 2001 7:43 PM
To: RE-wrenches at topica.com
Subject: Re: Carflex revisited [RE-wrenches]


Hi Bill,

How did the water get in the junction box?  I have never seen a water filled
junction box in my 10 years of solar but there is no way I have looked at
anywhere near as many modules as you have.  Usually I open them up only to
find those dry little cob webs and some dry dead spider in there.

Another point regarding the 90c rating for wire.  You'll find very over
current protection devices rated at any other than 60/75c so you cannot use
the ampacity rating of the wire @ 90c on that over current protection
device.  You have to use the rating and 60/75c.  Grab any breaker and see
what it says.

Travis Creswell
Ozark Solar
----- Original Message -----
From: "Bill Brooks" <billbrooks7 at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Monday, May 28, 2001 7:14 PM
Subject: RE: Carflex revisited [RE-wrenches]


> I have opened several module junction boxes that were full of water as
were
> their conduits

> Many
> electricians are often confused when the most common wire we use has the
> ratings THHN(90C Dry) or THWN(75C Wet). Does this mean we get to pick
which
> rating we like best? No it means that when applied in a "Dry Location" as
> specified in Article 100 above, that it carries a 90C rating and when it
is
> applied in a "Wet Location" as specified in Article 100 above, that it
> carries a 75C rating

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