Confused with three different systems tied into main panel

[don jon]

It might - it might also be a 125A bus bar.
Find out.


Maybe - maybe not.
You'd have to do a load calculation to see if a 90A service is sufficient.
And you'd have to see if your AHJ will allow it.

You may wind up having to install a 125A bus bar panel with a 100A main breaker.
(Or you might want to upgrade to a 200A service and a 225A busbar panel if that's not too expensive to do.)

Thanks for your quick response. im not sure what size the panel is as it may be an old set up. it was painted over at and i cant find any models etc. but i think bringing it down 90 amp shouldnt be a problem as its just a normal home with a 3.5 ton ac and no electric heaters. i guess i can turn on the ac and check how many amps my house pulls with most of the lights on.

[foo1bar]

i guess i can turn on the ac and check how many amps my house pulls with most of the lights on.

What you should do is a load calculation.

Search for "residential electrical load calculation"

There are PDF worksheets or excel spreadsheets or online versions.

It should only take you a few minutes walking around the house looking for nameplates and such.