Let me explain my problem in different way.
Current limiter in crossfeed bus is only 225 amps, yet allowable generator load in flight with single engine is 300 amps. How can 300 amps gen load be acceptable when crossfeed limiter is only 225 ?
Electrics was never my strong domains so having said that I assume that 300 amps load is being divided as it feeds three seperate busses and perhaps thats why 225 amps crossfeed limiter would not pop. Nevertheless I hope my older, wiser coligues can shed some light on it.