[RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?

[Lloyd Hoffstatter]

Jeff,

An oldie but attached tech note explains.
May Need to upsize G / N  for voltage drop depending on run…

Best regards,

Lloyd

Lloyd Hoffstatter
Sunstruck Consulting

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> on behalf of Jeff Clearwater <jeffc at villagepowerdesign.com>
Sent: Wednesday, November 13, 2019 12:00:37 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Subject: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?

Hey Folks,

So does anyone have a reference I can show my AJH as to whether there is any current on the neutral of a single phase 240 VAC SB 7.7-40 inverter?

705.95(B) states:

Neutral Conductor for Instrumentation, Voltage
Detection or Phase Detection. A conductor used solely for
instrumentation, voltage detection, or phase detection and
connected to a single-phase or 3-phase utility-interactive
inverter, shall be permitted to be sized at less than the
ampacity of the other current-carrying conductors and shall
be sized equal to or larger than the equipment grounding
conductor.

Be great not have to run 3/0 wire to my dedicated PV subpanel with 5 SB7.7s.  At 200 Amps I could use 6 AWG according to 705.95.  A huge savings in wire pull hassle not to mention copper.

Are there any other practical considerations for those SBs to operate well if I were to go that low with the neutral?

Anybody have any field experience with AJHs on this?

Thanks,

Jeff

~~~~~~~~~~~
Jeff Clearwater
Village Power Design
linkedin<https://www.linkedin.com/in/jeff-clearwater-0622a312/>
www.villagepowerdesign.com<http://www.villagepowerdesign.com>
cell - 413-559-9763
~~~~~~~~~~~~~~~~~~~~~~~
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