The root concur for the mater is that all of the motors are countesses duty and running all shift. The four largest motors are 300 hp at 345 fla. I will see 1300 to 1400 amps on the CT's during heavy loading.
The Main CB has had some over current faults. I am not wanting the fuses at the PDC to fault.
Even with a power study i have a hard time understanding why the OCP is lower then the calculated load?
if 4 x 300 hp at 345 fla/each all runnng simultaneously and continuously is accurate there is a problem
even if the motors are not fully loaded the 1200 mcc mcb and 1000 a feeder fuse look too small
even the mcc bus bar might be too small depending on arrangement/layout
what size starters? what type? full voltage, reduced voltage, vfd, etc
what size cb on each motor starter?
have you amp'ed the motors?