In 'Merica' you have to use a 2pole/3pole breaker or a breaker handle tie anytime you use a MWBC. Basically if you share a neutral.What do you mean? We only need tie bar handles/common trip for 240 volt loads, split receptacles, and a few other select things... If we run a 3 wire for 2 receptacles, pigtail the neutral to each device, we do not need a tie bar/common trip...
Of course, this is also the land of Freedom, Taco Tuesday, Chinese buffets and baseball. I wouldn't expect one of you silly French Canucks to understand!