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110.11 Deteriorating Agents. Unless identified for use in<br>
the operating environment,<font color="#6600cc"> no </font>conductors
or <font color="#6600cc">equipment<br>
shall be located in damp</font> or wet <font color="#6600cc">locations;
where exposed to</font><br>
gases, fumes,<font color="#6600cc"> vapors</font>, liquids, or other
agents <font color="#6600cc">that have a</font><br>
<font color="#6600cc">deteriorating effect</font> <font
color="#6600cc">on the conductors or equipment</font>; or<br>
where exposed to excessive temperatures.<br>
Informational Note No. 1: See 300.6 for protection against<br>
corrosion.<br>
<br>
110.18 Arcing Parts. Parts of electrical equipment that in<br>
ordinary operation produce arcs, sparks, flames, or molten<br>
metal shall be enclosed or separated and <font color="#6600cc">isolated
from all<br>
combustible material.</font><br>
<br>
300.6 Has a lot of good info on corrosion that we in the solar biz
should be all over, as well.<br>
<br>
So that's 3 pretty specific code references.<br>
<br>
Ray Walters<br>
<br>
On 12/13/2011 7:03 PM, <a class="moz-txt-link-abbreviated" href="mailto:boB@midnitesolar.com">boB@midnitesolar.com</a> wrote:
<blockquote cite="mid:4EE8040C.7060303@midnitesolar.com" type="cite">On
12/13/2011 5:47 PM, Dan Fink wrote:
<br>
<blockquote type="cite">Esteemed Wrenches;
<br>
An email question from my recent Home Power article on charge
controllers that I'm unsure of.
<br>
Does NEC specifically forbid mounting other gear, such as charge
controllers, inside a battery enclosure? How about shunts?
<br>
It's not in 480 that I can see, and 480 doesn't seem to treat
the interior of a battery enclosure as particularly explosive,
because as per 480 it has to be adequately vented anyway.
<br>
Of course there are a zillion common-sense reasons not to
actually DO that -- even an MX60 has a relay that can spark--
and of course corrosion on the controller terminals, circuit
board, etc. Bad news all around and I never do it. I learned
this as an apprentice back in the 1990s, and I just don't do it.
But I do put shunts in there sometimes...is this a no-no? The
shunt terminals are brass, I've never seen any really nasty
corrosion build up, but I'm quite curious.
<br>
BUT I'm wondering if I'm missing something obvious in some
other NEC section etc.
<br>
<br>
Thanks in advance!
<br>
<br>
</blockquote>
<br>
<br>
Hi Dan. Nice article, BTW !
<br>
<br>
<br>
The NEC doesn't say that you CAN do this, but it does not
dis-allow it either.
<br>
<br>
It will come down to what the battery manufacturer says, is what
we have found.
<br>
<br>
Sealed batteries are the only ones that can be mounted in a
battery box with
<br>
arc and spark equipment.
<br>
<br>
Look at UPS's that you buy from COSTCO for instance. They are UL
listed, usually.
<br>
<br>
boB
<br>
<br>
<br>
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