OK, I never install mwbc in residential applications but I see it frequently. I do mostly service and remodeling work and some of the homes in CA are wired almost exclusively with mwbc. I'm going to start an addition / remodel jub that has been going on for 3 years and I'll be cleaning up from some previous electricians. The last one installed 3 12/3 home runs to the new kitchen with the intent of using 1 for sm. app / disposal another for sm. app / dishwasher and the 3rd for refer / microwave. Since the permit is 3 yrs old, we're dealing with 2005 code. What is the real issue with using these existing home runs? I've never had a problem on small remodels using the original mwbc in kitchens. I see lots of posts where it's said to "stay away from mwbc in residential", Would it be worthwhile to pull these out and re-run. I think one of the reasons he used them is that the neutral bat is getting full in the panel, but I can deal with that issue.