The installation is a nursing home, this is a new installation and I would like to share the neutrals to cut down on the number of conductors needed. Each room has three receptacle circuits and I would like to run four conductors (3 phase and one neutral). The other option is to install arc fault receptacle (if they make them). Or last option is to run 6 conductors from the panel to the rooms and install arc fault breakers.
I have question about the question........ Why are you installing Arc Faults in a nursing home? Unless the units have permanent cooking provisions, they are not NEC required the way I read it.