[RE-wrenches] neutral sizing for sense

Tue Jan 25 08:37:34 EST 2022

"the maximum load connected between the neutral and any one ungrounded
[10] conductor plus the inverter [9] output rating shall not exceed the
ampacity [5] of the neutral conductor [6]." 

So the neutral conductor is supposed to be sized for the connected load
plus the entire maximum output of the inverter?

---

On 2022-01-24 12:10, Kirk Herander wrote:

> 705.95 AMPACITY OF NEUTRAL CONDUCTOR
> 
> National Electrical Code 2017 of New York State [1] > 7 Special Conditions [2] > 705 Interconnected Electric Power Production Sources [3] > 705.95 Ampacity of Neutral Conductor [4] 
> JUMP TO FULL CODE CHAPTER 
> 
> The ampacity [5] of the neutral conductors [6] shall comply with either (A) or (B). 
> 
> (A) NEUTRAL CONDUCTOR FOR SINGLE PHASE, 2-WIRE INVERTER OUTPUT [7]
> 
> If a single-phase, 2-wire [8] inverter [9] output is connected to the neutral and one ungrounded [10] conductor (only) of a 3-wire [8] system or of a 3-phase, 4-wire [8], wye-connected system, the maximum load connected between the neutral and any one ungrounded [10] conductor plus the inverter [9] output rating shall not exceed the ampacity [5] of the neutral conductor [6]. 
> 
> (B) NEUTRAL CONDUCTOR FOR INSTRUMENTATION, VOLTAGE, DETECTION OR PHASE DETECTION [7]
> 
> A conductor used solely for instrumentation, voltage [11] detection, or phase detection and connected to a single-phase or 3-phase interactive inverter [12], shall be permitted to be sized at less than the ampacity [5] of the other current-carrying conductors and shall be sized equal to or larger than the equipment grounding conductor [13]. 
> 
> On Mon, Jan 24, 2022 at 11:58 AM Foxfire Energy <dan at foxfire-energy.com> wrote: 
> 
>> I'd start with the manufacturers recommendations
>> 
>> Sent from my iPhone
>> 
>>> On Jan 24, 2022, at 11:52 AM, jay <jay.peltz at gmail.com> wrote:
>>> 
>>> HI All,
>>> 
>>> Where do I find in the code how to size a sense only neutral wire for GT inverter.
>>> 
>>> thanks
>>> 
>>> jay
>>> 
>>> peltz power
>>> 
>>> 
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> 
> -- 
> 
> Kirk Herander / kirkh at vermont.solar 
> 
> Owner|Principal, VT Solar, LLC 
> 
> _Celebrating our 31st Anniversary 1991-2022!!_ 
> 
> www.vermont.solar [14] 
> 
> dba Vermont Solar Engineering 
> 
> 802.863.1202 
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Links:
------
[1] https://up.codes/viewer/new_york/nfpa-70-2017
[2]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/7/special-conditions#7
[3]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/7/special-conditions#705
[4]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/7/special-conditions#705.95
[5]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/1/general#ampacity
[6]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/1/general#neutral_conductor
[7] http://webmail.redwoodalliance.org/./#NOP
[8]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/8/communications-systems#wire
[9]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/6/special-equipment#inverter
[10]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/1/general#ungrounded
[11]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/1/general#voltage_of_a_circuit
[12]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/1/general#interactive_inverter
[13]
https://up.codes/viewer/new_york/nfpa-70-2017/chapter/1/general#grounding_conductor_equipment_egc
[14]
https://nam02.safelinks.protection.outlook.com/?url=www.vermontsolarnow.com&amp;data=02%7C01%7C%7C9f0330d75a244870112408d685311841%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636842843233477645&amp;sdata=0NjyuKeQbEK6245SNnk8X4XnP9Q%2B%2BqtvcALkdDghvk4%3D&amp;reserved=0
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