Originally Posted by
dukespence
My omly concern other than my last question is that he wants to hookup (3) 50 amp breakers in the sub and then feed that to the main which will have a 125 amp breaker for the sub. Just seems to me it should be a 150 amp breaker installed but he said it should be fine since each of the three zones is supposed to only draw a max of 40 amps each. Is this correct?
Perhaps I spoke too soon and said the plan was fine, I did not do any calcs to confirm.
The feeder circuit should be rated 125% of this, to arrive at the 150 amp feeder circuit.
The electrician should know this. Perhaps he knows the load will not be all on at once.
If a service load calculation was not done, perhaps you need to find an electrician that will do it to confirm the service can handle this load, and size ths subpanel feeder correctly.