Check out Figure Figure B.310.15(B)(2)(1)
At 07:43 AM 11/4/2011, you wrote:
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.
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.
On Thu, Nov 3, 2011 at 5:42 PM, Jerry Caldwell
<<mailto:solarcow...@yahoo.com>solarcow...@yahoo.com> wrote:
Can anyone direct me to the NEC article that stipulates how many
inches of separation must be between cables operating at different voltages?
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?
Thanks,
Jerry Caldwell
From: Marco Mangelsdorf <<mailto:ma...@pvthawaii.com>ma...@pvthawaii.com>
To: 'RE-wrenches'
<<mailto:re-wrenches@lists.re-wrenches.org>re-wrenches@lists.re-wrenches.org>
Sent: Thursday, November 3, 2011 2:27 PM
Subject: [RE-wrenches] under performing Enphase inverters
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.
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.
Now I've got another suspect system with several underperforming
mods out of (36).
Has anyone else had this experience?
Thanks,
marco
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Drake Chamberlin
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