Drake,
Why not discuss this with Power One tech support?
Allan
Allan Sindelar
al...@positiveenergysolar.com
NABCEP Certified PV
Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder and Chief Technology Officer
Positive Energy, Inc., a Certified B CorporationTM
3209 Richards Lane
Santa Fe, New Mexico 87507
505 424-1112 office 780-2738 cell
www.positiveenergysolar.com
On 6/19/2013 1:55 PM, Drake wrote:
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.
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.
03:37 PM 6/19/2013, you wrote:
Content-Type:
multipart/related;
boundary="----=_NextPart_000_00A6_01CE6CE9.D20EFB20"
Content-Language: en-us
Doug,
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.
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.
--
John Stimac | Corvallis, OR
Renewable Energy Associates LLC
541-754-2001 Office/Fax
j...@renewableassociates.com
www.renewableassociates.com
From: re-wrenches-boun...@lists.re-wrenches.org
[
mailto:re-wrenches-boun...@lists.re-wrenches.org] On
Behalf Of
Drake
Sent: Wednesday, June 19, 2013 6:42
To: re-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] Full sized neutral - 240 V
inverter
Hello Wrenches,
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.
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.
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?
Thanks
Drake
Drake Chamberlin
Athens Electric LLC
OH License 44810
CO License 3773
NABCEP Certified Solar PV Installer
740-448-7328
http://athens-electric.com/
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