The bussing runs N - Top; then A,B,C - top down.
All of the Siemens 'big-boxes' I've installed (EUSERC) had a dedicated U/G pull section that took the bussing up high -- which feed a MAINS box -- with the current flowing from the Top down into the MAIN breaker -- thence off to bussing that exited low going to the various Distribution Boards.
These featured vertical bussing and 3 phase breakers mounted very much in the SqD I-Line style.
Your box appears to have a bottom to top current flow in the MAIN.
This would fail EUSERC standards.
Also, EUSERC would never permit your line side penetrations -- regardless of any other factor. It's space deeded over to the Poco -- and they don't want ANY customer circuits in their domain.
Where I come from the PM and Foreman would be pulled off the job/fired and the entire scheme re-worked.
BTW, on the load side, the bonding bushings make no sense.
The bonding conductor is improperly un-labled: it need be bare or banded green - -black doesn't cut it.
I see no provision for CT's or meters.
Is this, in fact, a sub-panel -- taking its power from a yet more powerful Distribution Board?
If this is the case, then the Poco is out of the picture, and you can get away with just re-routing the conductors -- per Code.
I still can't figure out how you're able to get away with reverse flowing the MAIN. That's a straight up Code violation -- right there.
