N-G Bond on dual fed residence

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augie47

augie47

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Tennessee
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State Electrical Inspector (Retired)
I am trying to figure out the best way to address this issue.
I have a small cabin completely wired with a 100 M/B loadcenter.
At this time there is no utility power available so the owner has installed a manual transfer switch and is feeding source #1 from a 30 amp/120v output on a portable generator. Source #2 is an 120v 20 amp GF receptacle on an inverter on a stand alone battery-solar system.
I have no intentional neutral-ground bond in the T/S or the loadcenter (there is continuity but the path is unknown at this time).
The GF receptacle on the solar output is not operating and there is no N-G bond on the generator 30 amp TL receptacle.
I need to establish a N-G bond to assure a ground fault return and my initial thoughts are that I need to have a N-G connection at the inveter and generator and switch the neutral through the T/S.
(A bond at the T/SD or panel will cause the solar 120v output GFCI to trip)
 
I think I'm following .....
Provide a bond at the generator OR the inverter output OR the load side of the transfer switch but not more than one, then the unswitched neutral at the transfer switch is ok.

If the inverter needs a N-G bond to operate, it will sense that condition even if the single bond is at the generator.
 
augie47 said:
I am trying to figure out the best way to address this issue.
I have a small cabin completely wired with a 100 M/B loadcenter.
At this time there is no utility power available so the owner has installed a manual transfer switch and is feeding source #1 from a 30 amp/120v output on a portable generator. Source #2 is an 120v 20 amp GF receptacle on an inverter on a stand alone battery-solar system.
I have no intentional neutral-ground bond in the T/S or the loadcenter (there is continuity but the path is unknown at this time).
The GF receptacle on the solar output is not operating and there is no N-G bond on the generator 30 amp TL receptacle.
I need to establish a N-G bond to assure a ground fault return and my initial thoughts are that I need to have a N-G connection at the inveter and generator and switch the neutral through the T/S.
(A bond at the T/SD or panel will cause the solar 120v output GFCI to trip)
Click to expand...
You answered your own questions in the OP;)
 
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