I have recently checked some houses in Elgin with a common builder and the under-sink receptacle for the dishwasher and disposal was a split duplex receptacle with a dedicated circuit for each appliance. This setup was protected by a 2 pole tied circuit breaker. When I questioned the electrical inspector he cited the 2008 NEC code for multiwire branch circuits, saying a common neutral wire required the 220v breaker.
It still seems to me that there would be a potential failure to trip if there was a problem on one appliance. Any comments?
Mark Kollath Home Inpection, Inc.