I believe that's what the code calls for (I'm in Alberta, Canada) but maybe I'm making it up. I'm just wondering what the reason behind that is. Is it to spread the load out more in the event that you're using several appliances right next to each other?
I ask because I wired an island that has three outlets on it but I only ran one 14/3 wire to all of them. So there is two circuits and each half of each duplex receptacle will be on a separate circuit, but the adjacent outlets are on the same two circuits (if that makes sense). Is there something I'm missing that could cause a catastrophic failure?