Yes that is what he is asking and I do not think it can be answered here with the info given.

We have no idea what the connected load of the 100 amp sub feed is, an AC unit with a 40 amp breaker does not draw 40 amps and 10 20 amp SP breakers do not draw 200 amps.

There are only two ways to answer this. [Linked Image]

1)Take real load measurements with an amp clamp. On a large job we would put in a data logger for a few days to a week.

2)Do the load calculations from the NEC.

I was just at a commercial job looking at a 400 amp panel with six 200 and two 100 amp 3 phase breakers in it (1400 amps total).

Was this panel maxed out?

I would have to say no as it has been that way for many years. [Linked Image]

Bob Badger
Construction & Maintenance Electrician
Massachusetts