The main rule in 230-40 says that each service drop or lateral shall supply only one set of service-entrance conductors. Exception #1 says that when a building has multiple occupancies, each occupancy is permitted to have a set of service-entrance conductors. The service-entrnace conductors are the conductors between the service drop or lateral and the service equipment. ( in looking at Article 100 I don't really see a difference between the definitions of "service conductors" and "service-entrance conductors") The service equipment is the apartment panel where the disconnect is. 230-71(a) says that each set service entrance conductors permitted by 230-40 Exception #1 shall have a disconnecting means. This disconnecting means is permitted to have up to 6 switches.
Don(resqcapt19)
