N-G bond

[Beckonweb]

Are you suggesting modifying a 200A main breaker service panel, disconnecting the busbar from the 200A service main breaker.
Installing feeders off the load side of the 200A service main that go to your ATS,
Then installing another set of feeders from the ATS back to the panel busbar?
Like this:
View attachment 2582035

Yes!!

 

[LarryFine]

Well Larry nailed in in post #2 so thats the answer to your original question.

Thank you. And post #4.

 

[jaggedben]

From a 200A main breaker in a service panel, we are feeding a 200A load breaker in a backup loads panel, then running it back to feed the original bus with all of the load breakers. Will this affect the N-G bond in the main service panel?

The N-G bond stays where it is.

Your drawing is vague as to what you are backing up and how. It shows your feed to the backup switch coming from the 200A service disconnect that does *not* feed the panelboard in the meter main. If that breaker current feeds a subpanel, you can wire that subpanel to the backup panel (hots and neutral) with no bonding issue. However if you want to also backup loads that are on the panelboard in the main, those loads need to be moved to the backup sub. (Just looked at one done like this the other day.) It would be an improper mod of the meter main to try to devert that busbar to the backup sub, and would create issues around needing to move or isolate the branch circuit neutrals.

 

[Beckonweb]

Thank you for that good advice. Will move the breakers (26 of them) to the subpanel.

 

[jaggedben]

Thank you for that good advice. Will move the breakers (26 of them) to the subpanel.

You might want to look at them individually and ask yourself and the client if all those really need to be backed up or will just be a drain on the battery. Looked at a different one recently where one of the circuits they moved over was the hot tub. Dumb. Less work for you and better outcome for the client if circuits they really don't need in an outage aren't backed up.