Re: Elevator Overcurrent Sizing
Do not forget that even with a 300 amp breaker your feeder conductors can be sized by the running load per the tables in 430. (430.6(A)
So you could use (approximately) 1/0 AWG to cover your 121 amp running load and still land these on the 300 amp breaker.
Breakers for motors are not overload protection, just short circuit and groundfault protection.
Most systems work best if they are kept simple rather than made complicated; therefore simplicity should be a key goal in design and unnecessary complexity should be avoided.