A switched receptacle routes branch-circuit power through a wall switch to control a plug-in load, eliminating the need for hardwired fixtures. Whether you are wiring a living room lamp outlet or a dedicated garage workbench, the physical wiring depends entirely on whether you need one half of the outlet to remain always-on (half-hot/split) or both halves to switch together (fully switched). You will need 14/3 or 14/2 NM-B cable, a 15A tamper-resistant (TR) duplex receptacle, and a single-pole switch. Below is the exact decision framework, material list, and termination sequence to get it right on the first pull.

The Decision Path: Half-Hot vs. Fully Switched Receptacles

Before stripping any wire, you must define the load topology. A half-hot receptacle requires an extra conductor to carry both the always-hot and switched-hot feeds simultaneously. Use this decision matrix to lock in your cable type and device selection.

Application Scenario Top Half Always-On? Bottom Half Switched? Required Cable (15A) Concrete Device Pick
Living room lamp + TV Yes Yes 14/3 NM-B (Black, Red, White, Bare) Leviton 5262 (15A TR Duplex)
Garage workbench tool No Yes (Both halves) 14/2 NM-B (Black, White, Bare) Leviton 5262 (15A TR Duplex)
Kitchen disposer (20A circuit) No Yes (Both halves) 12/2 NM-B (Black, White, Bare) Leviton 5362 (20A TR Duplex)

The Verdict: If you need a split receptacle (half-hot), you must run 14/3 NM-B (or 12/3 for 20A) to provide independent hot feeds. If both halves switch together, standard 14/2 NM-B is sufficient. For this guide, we will use a 15A circuit with 14 AWG copper wire and the Leviton 5262 receptacle as our baseline.

Tools, Materials, and Device Ratings

Working with 120V AC branch circuits requires precision tools to ensure low-resistance terminations and code compliance. The National Electrical Code (NEC) mandates specific ampacity and device ratings that must match your breaker.

Gauge and Device Rating Rule: A 15A breaker requires a minimum of 14 AWG copper wire and 15A rated devices. A 20A breaker requires a minimum of 12 AWG copper wire; you may use 15A receptacles on a 20A circuit if there are multiple receptacles, but for a single dedicated switched outlet, use a 20A rated receptacle (NEMA 5-20R).

Tools List:

  • Non-contact voltage tester (NCVT) and Digital Multimeter (e.g., Fluke 117)
  • Wire strippers calibrated for 14 AWG and 12 AWG solid copper (e.g., Klein 11055)
  • Lineman pliers and needle-nose pliers for forming J-hooks
  • Flathead and Phillips screwdrivers, plus a torque screwdriver set to 14 in-lbs (standard for most 15A device terminal screws)

Materials List:

  • Wire: 14/3 NM-B (Romex) for half-hot; 14/2 NM-B for fully switched.
  • Receptacle: 15A Tamper-Resistant (TR) duplex receptacle. NEC Article 406.12 requires TR receptacles in all dwelling unit living spaces to prevent child injury.
  • Switch: 15A single-pole toggle or rocker switch (e.g., Leviton 5601).
  • Connectors: Yellow or tan wire nuts (rated for 3x 14 AWG solid), grounding pigtails (14 AWG bare or green).

Mains Safety and Prep Protocol

CRITICAL MAINS SAFETY WARNING: Never work on energized branch circuits. De-energize the circuit at the main service panel by switching off the corresponding 15A or 20A breaker. Lock out or tag out the breaker panel to prevent accidental re-energizing. Verify the circuit is dead using a tested NCVT and a digital multimeter before touching any bare conductors. Local AHJ (Authority Having Jurisdiction) codes may require a licensed electrician for new circuit runs.

Verify Dead Protocol:

  1. Test your NCVT on a known live outlet to confirm the tester is functional.
  2. Scan the target switch and receptacle boxes. The NCVT should remain silent.
  3. Set your multimeter to AC Voltage (V~). Measure between the black (hot) and white (neutral) wires. Expected reading: 0.0V.
  4. Measure between the black (hot) and bare (ground) wires. Expected reading: 0.0V.
  5. Only proceed once 0V is confirmed across all combinations.

Step-by-Step: Wiring a Half-Hot (Split) Receptacle

In this topology, power enters the switch box first, and a 14/3 NM-B cable runs from the switch box to the receptacle box. This satisfies modern NEC requirements for switch loops by ensuring a neutral is available at the switch location.

At the Switch Box:

  1. Grounds: Connect the bare copper ground from the power source and the bare copper ground from the 14/3 cable together with a pigtail. Attach the pigtail to the green grounding screw on the switch.
  2. Neutrals: Wire-nut the white neutral from the power source directly to the white neutral of the 14/3 cable. Do not attach the white wire to the switch. This passes the neutral through to the receptacle.
  3. Line Hot: Connect the black wire from the power source to the bottom brass terminal screw on the single-pole switch. Form a clockwise J-hook around the screw and torque to spec.
  4. Switched Hot: Connect the red wire from the 14/3 cable to the top brass terminal screw on the switch.

At the Receptacle Box:

  1. Break the Tab: Using needle-nose pliers, snap off the small brass connecting fin tab on the hot (brass) side of the receptacle. This electrically isolates the top and bottom brass screws. Leave the silver (neutral) tab completely intact.
  2. Grounds: Connect the bare copper ground from the 14/3 cable to the green grounding screw on the receptacle.
  3. Neutral: Connect the white wire from the 14/3 cable to either of the silver terminal screws on the receptacle.
  4. Always-Hot: Connect the black wire from the 14/3 cable to the top brass terminal screw. This half will now have continuous 120V power.
  5. Switched-Hot: Connect the red wire from the 14/3 cable to the bottom brass terminal screw. This half will only receive power when the wall switch is toggled ON.

Step-by-Step: Wiring a Fully Switched Receptacle

If both the top and bottom outlets must turn on and off with the wall switch (e.g., a dedicated workbench light), the wiring is simpler and uses standard 14/2 NM-B.

  1. Do NOT Break the Tab: Leave both the brass and silver connecting fin tabs completely intact on the receptacle.
  2. At the Switch: Connect bare grounds to the green switch screw. Connect the line black (hot) to the bottom brass switch screw. Connect the load black (running to the receptacle) to the top brass switch screw. Wire-nut the white neutrals together in the back of the switch box.
  3. At the Receptacle: Connect the bare ground to the green receptacle screw. Connect the white wire to a silver terminal screw. Connect the black wire to a brass terminal screw.
  4. Cap Unused: If your cable includes a red wire (e.g., you used leftover 14/3), cap it with a wire nut at both ends. Never leave an uncapped conductor inside a junction box.

Verify and Test: Expected Meter Readings

Before pushing the devices into the drywall boxes, you must verify correct polarity and switching logic. Turn the breaker back ON at the panel.

Pro-Tip: Keep your hands clear of exposed terminal screws while taking live measurements. Use the multimeter probes carefully to avoid bridging the gap between the hot and neutral terminals, which will cause a dead short and trip the breaker.

Test Sequence for Half-Hot Receptacle:

  1. Top Half (Always-On): Insert probes into the top slots. Hot (short slot) to Neutral (long slot) should read 120V AC (acceptable range: 114V - 126V). Hot to Ground (U-shaped slot) should read 120V AC. Neutral to Ground should read <2V.
  2. Bottom Half (Switch OFF): Insert probes into the bottom slots. Hot to Neutral should read 0V. Hot to Ground should read 0V.
  3. Bottom Half (Switch ON): Toggle the wall switch. Hot to Neutral should now read 120V AC. Hot to Ground should read 120V AC.

Test Sequence for Fully Switched Receptacle:

  • With the switch OFF, both top and bottom slots should read 0V across all combinations.
  • With the switch ON, both top and bottom slots should read 120V AC (Hot to Neutral, Hot to Ground) and <2V (Neutral to Ground).

The Most Common Botch (And How to Avoid It)

The single most frequent failure mode in switched receptacle installations is failing to break the brass connecting fin tab when wiring a half-hot outlet.

The Symptom: The wall switch appears to do nothing. If you wired the always-hot feed to the brass screws, both halves of the receptacle will be constantly live, and the switch will just click uselessly. If you wired the switched-hot feed to the brass screws, both halves will turn on and off together, defeating the purpose of the split setup.

The Secondary Botch (The Silver Tab Disaster): Occasionally, an installer will mistakenly break the silver (neutral) tab instead of the brass tab, or break both. Breaking the silver tab when you only have one neutral wire feeding the box results in an open neutral on one half of the receptacle. Worse, if you are working on a Multi-Wire Branch Circuit (MWBC) and break the neutral tab, you can create a dead short or cause floating voltages that will instantly destroy plugged-in electronics.

The Fix: Always physically inspect the receptacle before pushing it into the box. Look at the brass side: the tab must be missing, leaving a visible gap between the top and bottom screws. Look at the silver side: the tab must be fully intact. If you accidentally break the wrong tab, throw the receptacle in the trash and start with a new $3 unit. Do not attempt to jumper a broken neutral tab with a piece of bare wire; the internal brass stampings are designed to carry the full 15A load safely, and field-modified jumpers can overheat or loosen under thermal expansion.

By following this exact termination sequence, verifying your meter readings, and respecting the physical isolation tabs on the device, your switched receptacle will operate safely and reliably for decades. For further reading on device safety standards, refer to the OSHA Electrical Safety guidelines regarding residential and commercial wiring practices.