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

Thu Nov 14 12:02:01 EST 2019

Lloyd - great find!

I am attaching a updated note that specifically calls out current products but has less code detail.

Best regards -
Mike

SMA America
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From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Lloyd Hoffstatter
Sent: Wednesday, November 13, 2019 10:38 AM
To: Jeff Clearwater <jeffc at villagepowerdesign.com>; RE-wrenches <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] 705.95(B) and Sunny Boys - current on Neutral?

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

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________________________________
From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org<mailto:re-wrenches-bounces at lists.re-wrenches.org>> on behalf of Jeff Clearwater <jeffc at villagepowerdesign.com<mailto:jeffc at villagepowerdesign.com>>
Sent: Wednesday, November 13, 2019 12:00:37 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org<mailto: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
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