1. Light fixture Undercabinet lights are available in fluorescent, halogen, and xenon models. We chose low-voltage halogen for its bright white light (see "10: Choosing the Light"). Measure upper wall cabinets to determine what length fixtures to buy—23 inches and 47 inches are typical sizes. You can gang them together for long runs.
2. Dimmer switch needs to be compatible with the light fixture you choose.
3. GFCI receptacle Once installed, this outlet’s ground-fault circuit interrupter will shut off instantaneously if you receive a jolt.
4. Two-gang, old-work electrical box This larger box replaces the existing single-gang receptacle box in the backsplash wall. An "old work" box is for remodeling—its "fins" unfold behind the drywall to lock it in place.
5. Two-gang wall plate
6. 12/2 NM (nonmetallic) electrical cable plastic-sheathed cable often referred to as Romex, a trade name. The 12/2 designation refers to its two 12-gauge copper wires—a neutral and a hot. It also holds a bare ground wire. You’ll need 6 feet of cable, including loose wires you’ll cut from this for Step #6.
7. Ground pigtail connector; cable connector; wire connectors
8. Wood or plastic cable protector may be required by some municipalities to protect exposed cable. Make from wood or buy as "nonmetallic raceway" in 5-foot lengths.