Originally Posted by TonyD
Could you set up a dedicated 20amp receptacle behind the dishwasher and then run a 12/2 round wire from the DW hook up and plug it into the receptacle.
You certainly should have a dedicated 15 or 20 amp rec for the dishwasher. The type of wire that you are talking about is SO cord and just to confuse things, when they name appliance cords they count the ground (unlike building cables) so it would be a 12-3 SO cord.
Some AHJ do not consider this to be an accessable disconnect because the dish washer is usually screwed to the cabinet. It is a better idea to put the rec in the cabinet just next to the dishwasher.
side note: When the ground wire is insulated and colored green, it is counted in the wire name. eg: 12-3 SO has two hots and a ground. When the ground wire is bare it is not. eg: 12-2 w/g NM-B