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How to Direct-Wire a Dishwasher

A dishwasher should have its own circuit. Have an electrician install the circuit and fish the cable to the area where you will install the dishwasher. Then follow the installation instructions of the dishwasher's manufacturer. Below are guidelines on how to make the wiring connections.

The internal wiring of a dishwasher terminates in the power junction box, just behind the dishwasher's kick panel. The connecting wires are black, white, and green. A green grounding screw is sometimes substituted for the green wire.
Internal Wiring of Dishwasher
PROJECT BASICS
  • Project: Easy
  • Estimated Project Time: 15 minutes, once circuit installed and cable fished to location
  • Start Tips:Have an electrician install a dedicated circuit and fish the cable to the dishwasher's location
  • Safety Tips: At the main panel, turn off power to the circuit before you start
  • Recommendation: Do-it-Yourself
TOOLS & MATERIALS
Dishwasher Multipurpose tool
12/2g NM cable Insulated screwdrivers
Knockout punch Long-nose pliers
Cable ripper Wire connectors
Cable clamp

INSTRUCTIONS
1) Remove a knockout
Make sure power to the circuit is turned off at the main panel. Then, using a knockout punch, remove a knockout on the dishwasher's junction box.
Pull and Secure CableFig. 1
2) Secure the cable
Pull the 12/2g NM branch-circuit cable into the box. Be sure to leave extra wire (3 to 4 feet) looped behind the dishwasher so that the appliance can be pulled away from the wall for later servicing (Fig. 1). Rip back the cable sheathing, cut away the excess, and secure the cable in the box using a cable clamp.
3) Strip the wires
After exposing the insulated wires, use a multipurpose tool to strip them from the branch-circuit cable.
Making ConnectionsFig. 2
4) Make the connections
Splice the black hot wire from the branch-circuit cable to the black hot wire from the dishwasher; cap with a wire connector. Then, do the same with the white neutral wires. Lastly, splice the bare copper grounding wire to the green appliance wire (if present), or connect it to the green grounding screw in the dishwasher's junction box to complete the appliance wiring. (Fig. 2)

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