Thanks all.
It was my understanding that we should still be running the conductors
of the same circuit through the same raceway, even if it is the DC input
into the inverter since that DC oscillates slightly (nowhere near as
much as AC). I wasn't concerned about eddy currents in the FNMC of
course but the metal box itself, a concern being voiced on this list
before. I'd be more concerned about this if it were a 1MW inverter
rather than a 7kW, but still.
Thanks for the info on the GEC tap and I'm glad the split bolts work here.
The conduit in question doesn't seem to be there just for physical
protection; the wire runs from the east end of the array for 100'+ and
only the last 3' are in conduit. If it were only for protection I'd be
fine with it being open-ended on both ends, but since it's there to feed
the conductors into the box, that's why I was treating it as a regular
conduit that required a cord grip at the other end. Where do others make
the distinction?
Thanks,
DKC
-------- Original Message --------
Subject: Re: [RE-wrenches] DC positive and negative in same conduit,
other inspection issues
From: Kelly Keilwitz, Whidbey Sun & Wind <ke...@whidbeysunwind.com>
To: RE Wrenches listserve <re-wrenches@lists.re-wrenches.org>
Date: 2009/8/19 21:10
Dave,
Only GEC's are subject to the "continuous" rule (250.64C). It sounds like
your are talking about an EGC tapped from the GEC.
When splicing PV GEC's required under 690.47D, either together (from
separated arrays) or to the existing AC GEC (if close enough), we have been
allowed to use split bolts instead of irreversible splices, per 250.64D1,
"Grounding Electrode Conductor Taps" (at end of paragraph). I.E., the
"continuous" rule is only being applied to the main GEC.
I agree with Kurt on the LTNMF being used only as extra (not required) wire
protection for the USE-2. We often do this when running PV conductors
between short separations in modules or rails. I would think that only
temperature and fill corrections would apply - and only if the length
requires.
-Kelly
Kelly Keilwitz, P.E.
Whidbey Sun & Wind, LLC
Renewable Energy Systems
NABCEP Certified PV Installer
987 Wanamaker Rd,
Coupeville, WA 98239
PH & FAX 360-678-7131
sunw...@whidbeysunwind.com
On 8/19/09 2:41 PM, "Dave Click" <davecl...@fsec.ucf.edu> wrote:
For the grounding electrode wiring, it seems that it's fine to me since
they ran the continuous #6 to each rail and then to the rod, qualifying
as the 690.47(D) supplemental electrode. But the split bolts tapping
that GEC to "ground the disconnect," these are required to be
irreversible connections to the ground bus in that disconnect, right?
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