On 10/09/2014 10:14 AM, Pete C. wrote:

125A would be the maximum size you can use (with appropriately rated
wiring), that is the max branch circuit size allowed by code for
residential services. You'll have to special order 125A breakers though
as they are not common.

What is the definition of "branch circuit"? We have a small panel in the
garage back-to-back with the meter. That has two 100Amp breakers
(ganged) from which the "main" panel in the basement is fed, and a 15Amp
breaker feeding the lights and outlets in the garage. Is everything fed
from that panel in the basement part of a "branch circuit" and limited
to 125A? E.g., IF* we got our service upgraded (I have no idea what
gauge wire is used to the meter and from the meter to the panel in the
garage) and ran heavier-gauge conductors from the panel in the garage to
the one in the basement, would we still be limited to 125A from the
panel in the basement?

* We've never tripped the 100Amp breakers, so the question is academic.

Perce