Never had this problem till" NOw.In n.j.only!210.4 B states:each multiwire branch circuitshall be simultaneusly disconnected with all other corrisponding breakers!?please read it and let me know how you interprete it.Am, having a very hard time with it.Up to now,in 40 years of knowlrdge,I have always put single breakers ,# different phases and aneutral feeding 3 different 120v circuits:lights and or recepticals.Only exeption{exibit 210.1 and 210.2},wich i can agree with.Had installed a 277 for lighting only as well as 2 thre phases panels feeding lights and recepticals,besides 3 phase motors.According to a n.j.inspector ,I had to replace single pole breakesTo double or triple breakers because i was using three ,or two hot legs with a neutral.Or install breaker ties!Absurd!As far back as i can remember we always installed 12-2 romex feeing two circuits in kitche ,three phase with a neutral etc.I bet you 100 % of all building work has been done that way in the past.Do you know how much money is involved if we now have to change this practic?Single neutral for each circuit ,or breaker ties?It is not practical and not right!What cvan we do to change this?Please get back.The last job almost put me out of business because of this!