Samsonite801
Solar Wizard
- Joined
- Oct 15, 2020
- Messages
- 2,997
There are a couple of different ways to set it up, depending on whether you are going to consider the generator as a separately derived power source or not...
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Since we can only have one N-G bond based on NEC and safety, if the generator has an N-G bond, then while it is connected to the house system, all other N-G bonds must be opened during that connection, once the generator is fully disconnected (including N and G) from the system, another N-G bond closest to the power source needs to be re-established, through the switching mechanism.
The purpose of the N-G bond is to provide the best ground return path back to neutral of the power source, so as an over-current short will cause enough current to flow to trip the breaker and remove the threat (since an Earthing ground rod is not considered a reliable low resistance path back to the power source). And we only want one so we don't get objectionable neutral current flowing through a ground wire between 2 bonds...
More info:
Does Your System Qualify as a "Separately Derived Source"?
Recently there's been a lot of talk around grounding and neutral issues on some of these AIOs coming from China without any UL testing. Here's a start to the conversation that I think any DIYer needs to pay very close attention to prior to embarking on a build that attempts to act as their...
diysolarforum.com
Grounding and Bonding of Separately Derived Systems
Separately derived systems (SDSs) include most transformers as well as any generator or UPS supplying a transfer switch that opens the neutral conductor. What makes a system separately...
www.ecmweb.com
Since we can only have one N-G bond based on NEC and safety, if the generator has an N-G bond, then while it is connected to the house system, all other N-G bonds must be opened during that connection, once the generator is fully disconnected (including N and G) from the system, another N-G bond closest to the power source needs to be re-established, through the switching mechanism.
The purpose of the N-G bond is to provide the best ground return path back to neutral of the power source, so as an over-current short will cause enough current to flow to trip the breaker and remove the threat (since an Earthing ground rod is not considered a reliable low resistance path back to the power source). And we only want one so we don't get objectionable neutral current flowing through a ground wire between 2 bonds...
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