Installing a new D/W at wife's house, noticed 15A c/b marked general lighting to be on same circuit as D/W & Disposal. It appears to control light over sink and disposal switch. I don't think the house was build w disposal b/c box that it plugs into is attached to face of cabinet and has wire coming out of bottom of box to D/W. I think this box is tied to the outside electrical box on outside opposite wall.