Joe,
I'd like to see a main disconnet here, but I don't think that the NEC requires one. We have one sevice with multiple sets of service entrance conductors as permitted by 230-40 Exception #1. This exception permits each occupancy to have its own set of service entrance conductors. I would think that each apartment is an occupancy. 230-71(a) says that each set of service entrance conductors permitted by 230-40 Ex#1 is permitted to have not more than 6 switches to serve as the service disconnecting means.
The #6 ground is ok for size based on 250-66(a), but is required to be spliced only by irreversible means by 250-64(c). The #8 GECs to each appartment would be taps as permited by 250-64(d).
Don(resqcapt19)
