All questions and answers are based on the 2017 NEC.
Underlined text indicates a change in the rules for the 2017 NEC.
Q. What is the Code rule for sizing service conductors for dwellings?
A. For dwelling units, service and feeder conductors supplied by a single-phase, 120/240V and 120/208V system can be sized in accordance with the requirements contained in Sec. 310.15(B)(7)(1)