In this case, the tap conductors off the 400A feed thru lugs will terminate in a 225A breaker that will feed the elevator controller. The tap conductors are 2/0 awg thwn, which is more than 1/3 the ampacity of the panel board and main breaker(400A) feeding the panelboard. There is also less than 25 feet in length between the origin of the tap and the elevator breaker. I'm giving you more info to pull some more teaching out of you.
