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A very common cable for 100 A service conductors has 2 - #2 AL wires and
1 - #4 AL for the neutral; 200 A will have 2 - 4/0 AL wires and 1 -
2/0 for the neutral. If I run # 2 to limit the VD on the run
to the panel and reduce the neutral to #4, #12 copper phase and neutral
will still connect to the inverters. This would be code for a
feeder to a separate structure. <br><br>
Does the Power One inverter actually have a major imbalance resulting in
substantial neutral currents? If so, it is really a 120 V inverter for VD
calculations. <br><br>
<br>
03:37 PM 6/19/2013, you wrote:<br>
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Doug,<br>
705.95(B) allows you down size your neutral if it is used solely for
instrumentation and it must be sized equal to or larger than the EGC but
this is not the case. If Power One says a full size neutral is needed
than that means that it is not just a voltage sensing conductor used for
instrumentation and that it does carry current.<br>
<br>
I don’t believe there are any exceptions in code for downsizing your
neutral in regards to upsizing the conductors to account for voltage drop
but I could be wrong. <br>
<br>
--<br>
John Stimac | Corvallis, OR<br>
Renewable Energy Associates LLC<br>
541-754-2001 Office/Fax<br>
<a href="mailto:john@renewableassociates.com">
john@renewableassociates.com</a><br>
<a href="http://www.renewableassociates.com/" eudora="autourl">
www.renewableassociates.com</a><br>
<img src="cid:7.1.0.9.0.20130619154659.059de348@redwoodalliance.org.1" width=200 height=79 alt="REAL_logo_black2">
<br>
<br>
<br>
<br>
<b>From:</b> re-wrenches-bounces@lists.re-wrenches.org
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" eudora="autourl">
mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of
</b>Drake<br>
<b>Sent:</b> Wednesday, June 19, 2013 6:42<br>
<b>To:</b> re-wrenches@lists.re-wrenches.org<br>
<b>Subject:</b> [RE-wrenches] Full sized neutral - 240 V inverter<br>
<br>
Hello Wrenches,<br><br>
Power One tech support said that full sized neutrals had to be run to a
pair of 240 V, PVI 3.6 inverters. We have a 180 foot underground
run to the service panel. <br><br>
Why do we need to run a full sized neutral all the way back to the
panel? The wiring to the panel is oversized for voltage drop.
The code allows for reduction of neutral size where neutral imbalance is
less than the current of a phase, which is usually the case. <br><br>
Why does a neutral need to be installed that is the size of the phase
wiring where the imbalance should be negligible? Or is there a lot of
neutral current for some reason? Am I missing something?
<br><br>
Thanks<br><br>
Drake <br><br>
<br>
Drake Chamberlin<br>
<i>Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV Installer<br>
740-448-7328<br>
</i><a href="http://athens-electric.com/">http://athens-electric.com/</a>
<br><br>
<br>
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