i have done 2. 1 was 3 story required a 240v 10/3wg on 30amp breaker to elevator companys disconnect/controller.
the other was a 2 story 1 30amp 240v 10/3wg for motor 1 120v home run for cab lights a switch for a work light in top of shaft and a gfi recpt.also a phone line
I've wired a dozen residential elevators. Regardless of the number of floors they've serviced they've always required a 30A 240 with neutral (10/3). Most require separate power (no more than a 14/2) for the cab lights some don't.