installing waste disposal unit Home › Forums › Public Forums › General Plumbing › installing waste disposal unit This topic has 1 reply, 2 voices, and was last updated 23 years, 3 months ago by fourth year. Viewing 1 reply thread Author Posts 16 Dec 2000 at 11:00 pm #274162 MasterPlumbersKeymaster how to connect wiring on waste disposal unit 16 Dec 2000 at 11:52 pm #289275 fourth yearParticipant Assuming a 120 volt unit, black on disposer to black or smooth in cord. White to white or ribbed on cord. Green to the ground/earth screw. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In