Steps // How to Install Undercabinet LED Lighting
1 ×

Overview

 
Step One // How to Install Undercabinet LED Lighting

Overview

overview illustration of undercabinet LED lighting
Illustration by Gregory Nemec

Day-to-Day Timeline

SATURDAY Add the new outlet and power supply (Steps 1–8).
SUNDAY Run wiring for the lights (Steps 9–14).

 
2 ×

Feed Up the Fish Tape

 
Step Two // How to Install Undercabinet LED Lighting

Feed Up the Fish Tape

Mark Powers feeds up the fish tape for undercabinet LED lighting
Photo by Kolin Smith

To power the lights, we installed a remodeling wiring box above an upper cabinet and borrowed from the dedicated circuit powering the microwave. Start by flipping off the breaker to the existing outlet, then check with a tester that the electricity is off. Pull out the outlet and, with a screwdriver, bang free one of the metal knockouts in the box. Use a drywall saw to cut a hole for the remodeling box in the wall above the cabinet. Feed the fish tape up through the knockout, as shown, and out of the new hole in the drywall.

Tip: Plan to use an accessible but hidden outlet to run the LED power supply, like one above or inside a cabinet. If you’re adding an outlet, locating the new one in the same stud bay as an existing outlet makes using the fish tape easier.

 
3 ×

Pull Down the Wire

 
Step Three // How to Install Undercabinet LED Lighting

Pull Down the Wire

with linesman pliers, pulling dow wiring for undercabinet LED lighting
Photo by Kolin Smith

With pliers, strip the insulation off the length of 12⁄2 wire. Hook the ground to the fish tape and cover the connection with electrical tape, as shown. Pull the fish tape through the knockout until about 10 inches of wire is exposed, then free the fish tape. Cut the first 6 inches of wire for pigtails, and use a utility knife to free the three individual wires from the yellow sheathing. Strip all the ends of the pigtails and the ends of the 12⁄2 wire. Grab all three white wires—for the existing outlet, the new outlet, and the pigtail—and join them with a wire nut. Repeat the process for the black and ground wires. Rewire the existing outlet, push all the wiring into the box, and screw the outlet back into place.

 
4 ×

Add Dimmer

 
Step Four // How to Install Undercabinet LED Lighting

Add Dimmer

adding the wiring to the dimmer switch for undercabinet LED lighting
Photo by Kolin Smith

At the opening for the outlet, cut the 12⁄2 wire and thread it through a remodeling box. Install the box in the wall, strip the wires, and attach them to the new outlet. Screw the outlet in place and secure the trim plate. Add the power supply’s red and black wires to the inputs on the wireless dimmer: red to positive, black or white to negative, as shown. Complete the connection by tightening the setscrew.

Tip: Let the system’s wiring hang free until all the LED tape is in place, then go back and secure wires and terminals to the cabinets with staples and screws.

 
5 ×

Plug in the Power Supply

 
Step Five // How to Install Undercabinet LED Lighting

Plug in the Power Supply

Mark Powers connects the power supply from on top of the cabinets for undercabinet LED lighting
Photo by Kolin Smith

Place the power supply and the dimmer on top of the upper cabinets. Plug the power supply into the new outlet. Cut a length of 18⁄2 solid-core wiring—sold as thermostat wiring—so it’s long enough to reach from the dimmer down the back of, and underneath, the corner cabinet. Drape the wiring along the cabinets, as shown.

 
6 ×

Wire Up the Terminal

 
Step Six // How to Install Undercabinet LED Lighting

Wire Up the Terminal

wiring up the terminal for undercabinet LED lighting
Photo by Kolin Smith

Cut the red and black wire so that it reaches the center underneath the corner cabinet. Add the red wire to one end of the terminal and tighten the setscrew, as shown. Repeat the process for the white or black wire. From here, you’ll add wiring to branch in two directions to cover both walls of the L-shaped kitchen.

 
7 ×

Cut the Tape

 
Step Seven // How to Install Undercabinet LED Lighting

Cut the Tape

cutting the LED tape to length with scissors for undercabinet LED lighting
Photo by Kolin Smith

From the middle of the corner cabinet, measure the length of tape needed to cover the cabinets along one wall. Use scissors to cut the LED tape across the center of the copper contacts, as shown. Repeat the process for the other wall of cabinets.

 
8 ×

Wire Up the LEDs

 
Step Eight // How to Install Undercabinet LED Lighting

Wire Up the LEDs

adding wires to the LED tape for undercabinet LED lighting
Photo by Kolin Smith

Use LED tape-light extension connections to turn the terminal into a splitter, sending power to both walls. These 4-foot extensions have two wires, white for positive and white with a black stripe for negative, with a clamp on one end that grips onto the LED tape. Join the tape to the extension by peeling away the adhesive backing under the copper contacts. Slide the tape into the connector with the logo facing up, as shown. Make sure to align the polarity of the extension to the markings on the tape. Wiggle the tape in so it seats completely. Flip the connector over and snap the lock closed with a slotted screwdriver. Repeat this process for the LED tape running under the other wall of cabinets. Then twist together the positive ends of the extensions and fit them into the terminal across from the red wire. Tighten the setscrew and add both negative wires to the terminal in the same way.

 
9 ×

Tweak the Beam

 
Step Nine // How to Install Undercabinet LED Lighting

Tweak the Beam

Mark Powers adjusts the LED tape under the cabinet for undercabinet LED lighting
Photo by Kolin Smith

Restore the power at the panel. Hold the tape to the underside of the cabinet and adjust the light’s coverage. Keep the strip 1 to 2 inches back from the face frame to distribute the 120 degrees of light evenly across the backsplash and countertop, as shown. If you have a dark countertop, install the tape against the back of the face frames, with the LEDs pointing toward the backsplash, to eliminate bright spots.

 
10 ×

Create Passageways

 
Step Ten // How to Install Undercabinet LED Lighting

Create Passageways

Mark Powers drills holes between the underside of the cabinets for the LED passage for undercabinet LED lighting
Photo by Kolin Smith

Once you determine the light’s location—ours is about an inch away from the face frame—drill a 1⁄2-inch-wide hole with a paddle bit through the sides of neighboring cabinets at that spot, as shown. This allows the LED tape to travel underneath the cabinets. To install the LEDs against the face frame, slice through cabinet sides with an oscillating tool. Don’t press the tape in place yet.

 
11 ×

Get Inside a Cabinet

 
Step Eleven // How to Install Undercabinet LED Lighting

Get Inside a Cabinet

Mark Powers drills holes under cabinet to add wiring for undercabinet LED lighting
Photo by Kolin Smith

Drill more holes underneath the cabinets to allow the wiring to pass through. In kitchens where wall cabinets change height, such as to a shorter one above a sink, run wiring inside the adjacent taller cabinet. Clamp plywood scrap to the inside of the cabinet, to prevent tear out, then drill a 1⁄2-inch-wide hole with the paddle bit in the corner, as shown. Add a second hole, 90 degrees to the first one, through the cabinet wall and in line with the underside of the shorter cabinet above the sink.

 
12 ×

Press the Tape in Place

 
Step Twelve // How to Install Undercabinet LED Lighting

Press the Tape in Place

pressing tape into place for undercabinet LED lighting
Photo by Kolin Smith

Wipe the undersides of the cabinets with denatured alcohol so the tape will stick properly. Peel the backing off the LED tape and press it in place under the straight run of cabinets. The tape on the far end closest to the shorter cabinet above the sink should line up with the hole, as shown.

 
13 ×

Wire Inside the Cabinet

 
Step Thirteen // How to Install Undercabinet LED Lighting

Wire Inside the Cabinet

connecting the wiring inside the cabinet for undercabinet LED lighting
Photo by Kolin Smith

Align the polarity of the free end of the tape and an extension, and clamp down the connection. Fish the wires up through the hole and into the corner of the cabinet. Measure, cut, and add extensions to enough LED tape to cover the underside of the cabinet above the sink. Push the wires through the hole in the taller cabinet. Twist together the two stripped positive wires and secure them with low-voltage wiring nuts. Repeat the process for the negative wires, as shown. Tuck the wires into the corner of the cabinet’s face frame.

 
14 ×

Add the Switch

 
Step Fourteen // How to Install Undercabinet LED Lighting

Add the Switch

adding the undercabinet LED lighting switch
Photo by Kolin Smith

Peel and stick the LEDs to the under-side of the cabinet above the sink. Screw the wireless touch pad’s bracket to the wall and install the switch and cover plate. Disconnect the power, then plug the power back in; the touch pad should pair with the wireless dimmer. Now screw the terminal to the underside of the cabinet.

 

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