Lets say you run 12/4 w/ground and use 3 as hots, 1 as neutral and 1 as ground. The three hots all go to 20 amp breakers. Two of the three circuits will feed out to my kitchen countertop required small appliance branch circuits (GFI protected). The other circuit will be a dedicated receptacle for a plug and cord garbage disposal. At what point do I know that I am overloading the neutral? What are the rules about how many circuits you can run off of one neutral? Any help would be appreciated.
