ECN Forum Forums Code Related Discussion NEC & other Code issues 400A service

You need to be more specific.

Voltage
Meters
Main
Dist
Locations
Conduit?
Does the 400A CT Section include Meters,Main,
dist. to panels?

Without more info, no one could accurately tell you the size, whether it's a GC GEC or GCE or even required to the panels, or even if you should be bonding(main bonding jumper) at the two panels.