service

[normbac]

I am installing per plan a metered 400 amp residential panel on a home and then feeding a ( metered for homeowner to read only) outdoor semi flush 200 amp res. panel on a guest home does table 310.15 B6 apply for sizing the feeders Should this be treated as a sub meaning an isolated ground at the 200 amp am confused how to treat this 200 do I need to pull a egc from the 400 and what size. A seperate ufer will be applied on the guest home.
Thanks for any clarity on this.

 

[Physis 3]

The second panel isn't a service panel. It has to be a sub panel. If I remember right a seperate building needs it's own grounding electrode. You can either bond the two electrode systems and use a EGC between panels or the elctrode systems can be kept seperate and each panel has a MBJ. I think. I still haven't got a new NEC yet, I can't check it.