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Check out Figure Figure B.310.15(B)(2)(1) <br><br>
<br><br>
At 07:43 AM 11/4/2011, you wrote:<br>
<blockquote type=cite class=cite cite="">Separation is an issue the NEC
does not address clearly .However, please make sure you allow adequate
room to repair the conduit if damaged, and 12' seems to be the magic
number. I lso had no luck looking in 490.<br><br>
NEC 300.4(C)(2)(e) also seems a bit relevant where it allows for
conductors of different voltage ratings in manholes "if the
conductors of each system are permanently and effectively separated from
the conductors of the other systems...", but again this may be
referring to separate trenches with different system voltage ratings
entering the same manhole for tapping, allowing access for maintenance or
other uses. <br><br>
<br><br>
On Thu, Nov 3, 2011 at 5:42 PM, Jerry Caldwell
<<a href="mailto:solarcowboy@yahoo.com">solarcowboy@yahoo.com</a>>
wrote:<br>
<dl>
<dd>Can anyone direct me to the NEC article that stipulates how many
inches of separation must be between cables operating at different
voltages?<br><br>
<dd>I have a project with PV combiner box home runs at 1,000 volts DC in
the same trench with 12.47 kV cables. Table 300.5 shows minimum
cover requirements for direct burial cables, but this is the distance
beneath grade the cables must be. Is there anywhere in the code
that calls for a minimum separation distance between cables at different
voltages?<br><br>
<dd>Thanks,<br>
<dd>Jerry Caldwell<br><br>
<br><br>
<br>
<dd><font size=2>From:</b> Marco Mangelsdorf
<<a href="mailto:marco@pvthawaii.com">marco@pvthawaii.com</a>><br>
<dd>To:</b> 'RE-wrenches'
<<a href="mailto:re-wrenches@lists.re-wrenches.org">
re-wrenches@lists.re-wrenches.org</a>><br>
<dd>Sent:</b> Thursday, November 3, 2011 2:27 PM<br>
<dd>Subject:</b> [RE-wrenches] under performing Enphase inverters<br>
</font><br>
<dd>For the first time, several weeks ago, after 40-50 Enphase installs,
we’ve come across at least two M210s that we putting out consistently
lower outputs than their immediate neighbors.<br>
<dd> <br>
<dd>We replaced the two mods first, which made no difference. Then,
in consultation with Enphase, replaced the M210s. After replacing
them, the power output was as it should be.<br>
<dd> <br>
<dd>Now I’ve got another suspect system with several underperforming mods
out of (36).<br>
<dd> <br>
<dd>Has anyone else had this experience?<br>
<dd> <br>
<dd>Thanks,<br>
<dd>marco<br>
<dd> <br><br>
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-- <br>
James B Rudolph<br>
NABCEP Certified PV Installer<br><br>
</b><br>
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<x-sigsep><p></x-sigsep>
<font size=2>Drake
Chamberlin<x-tab> </x-tab>
<br>
ATHENS ELECTRIC LLC<br>
OH License
44810<x-tab> </x-tab><br>
CO license 3773<br>
NABCEP Certified PV<br>
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