A switched outlet—commonly called a half-hot or split receptacle—is the standard solution for living rooms and bedrooms where you want a wall switch to control a table lamp while keeping the other half of the outlet live for a vacuum or phone charger. The direct answer to how this works is simple: you break the connecting brass tab on the hot side of a standard duplex receptacle, feeding one half with constant line voltage and the other with a switched hot wire.

However, modern electrical code has changed how the switch loop must be wired. The old method of using a 2-conductor cable and re-identifying the white wire as a hot is no longer compliant in most jurisdictions. This guide provides the exact decision path, materials, and step-by-step termination sequence for a code-compliant split receptacle using a 3-conductor switch loop.

The Switched Outlet Decision Matrix

Before pulling any wire, confirm which configuration your space actually requires. Use this decision tree to select your device and wiring topology.

Scenario & Load Type Configuration Required Concrete Device Pick (15A Circuit)
Living room/bedroom lamp control; vacuum or TV needs constant power on the same yoke. Half-Switched (Split) Receptacle with 14/3 switch loop. Default Pick: Leviton 5262-SW (15A Tamper-Resistant Duplex)
Garbage disposal, dishwasher, or dedicated appliance that must be completely disconnected via a wall switch. Fully Switched Receptacle (tab remains intact, switch breaks the single hot feed). Leviton 5262-SW (15A) + Leviton 5221 (15A Single-Pole Switch)
Kitchen countertop or bathroom vanity where a switch controls a light, but outlets must remain live and protected. Do NOT use a switched outlet here. Code requires uninterrupted GFCI protection for countertop/vanity loads. N/A (Use separate switch and GFCI receptacle)

For the remainder of this guide, we are executing the Half-Switched (Split) Receptacle configuration on a standard 15-amp residential branch circuit, as this represents 90% of DIY switched outlet searches.

Tools, Materials, and Sizing for a 15A Branch Circuit

Do not mix 14 AWG wire with 20A breakers, and do not use 15A receptacles on 20A circuits without verifying the specific ampacity rules. The list below assumes a standard 15A circuit protected by a 15A breaker.

Materials & Sizing

  • Feed Cable: 14/2 NM-B (Romex) with ground. Rated for 15A at 60°C column. (Cost: ~$0.45/ft). If your circuit is 20A, you must upgrade all wire to 12/2 NM-B and use a 20A receptacle (Leviton 5362).
  • Switch Loop Cable: 14/3 NM-B (Black, Red, White, Bare). NEC 404.2(A) requires a neutral at the switch box, which is why 14/3 is mandatory for new installations. (Cost: ~$0.65/ft).
  • Receptacle: Leviton 5262-SW 15A Tamper-Resistant (TR) Duplex Receptacle. (~$3.50 each).
  • Switch: Leviton 5221 15A Single-Pole Toggle Switch. (~$2.00 each).
  • Connectors: Ideal 341 Orange In-Sure push-in wire connectors or standard wire nuts rated for 3x #14 AWG.

Required Tools

  • Non-contact voltage tester (e.g., Milwaukee 2202-20)
  • Digital multimeter (e.g., Fluke 117) for verification
  • Wire strippers (e.g., Klein 11055 for 10-18 AWG)
  • Lineman pliers and side-cutting pliers (diagonal cutters)
  • Phillips #2 and flathead screwdrivers
CRITICAL MAINS SAFETY WARNING: Working on branch circuits involves lethal 120V AC. You must de-energize the circuit at the main service panel. Turn off the 15A breaker, apply a lockout/tagout device if possible, and verify the circuit is dead using a tested non-contact voltage tester and a multimeter at the receptacle box before touching any bare copper. NEC-style guidance is provided here; your local Authority Having Jurisdiction (AHJ) has final authority on permits and code compliance. If you are unsure, hire a licensed electrician.

Step-by-Step: Wiring the Half-Switched (Split) Receptacle

This topology assumes power (the 14/2 feed) enters the receptacle box first, and the 14/3 cable runs from the receptacle box to the switch box.

  1. Prepare the Cables: Strip 3/4 inch of insulation from all individual conductors in both the 14/2 feed and the 14/3 switch loop. Fold the bare copper ground wires back to keep them out of your way during hot/neutral terminations.
  2. Break the Brass Tab (The Crucial Step): Look at the side of the Leviton 5262 receptacle. You will see a small brass fin connecting the top and bottom brass screws. Use your side-cutting pliers to grip this tab and bend it back and forth until it snaps off completely. Do not break the silver tab on the neutral side.
  3. Terminate the Receptacle Grounds: Twist the bare copper from the 14/2 feed, the bare copper from the 14/3 switch loop, and a 6-inch bare copper pigtail together. Secure with a wire nut. Attach the free end of the pigtail to the Green ground screw on the receptacle.
  4. Terminate the Receptacle Neutrals: Twist the White wire from the 14/2 feed, the White wire from the 14/3 switch loop, and a 6-inch White pigtail together. Secure with a wire nut. Attach the free end of the pigtail to either Silver neutral screw on the receptacle. (The switch box needs this neutral to pass through to satisfy code, even if the switch itself doesn't use it).
  5. Terminate the Always-Hot (Top Half): Connect the Black wire from the 14/2 feed directly to the Top Brass screw on the receptacle. This half will now have constant 120V power.
  6. Terminate the Switched-Hot (Bottom Half): Connect the Red wire from the 14/3 switch loop directly to the Bottom Brass screw on the receptacle. This half will only receive power when the wall switch is closed.
  7. Terminate the Wall Switch: At the switch box, connect the Black wire from the 14/3 cable to the Bottom Brass screw (Line) on the Leviton 5221 switch. Connect the Red wire from the 14/3 cable to the Top Brass screw (Load). Splice the White wire from the 14/3 cable to any incoming neutral in the switch box using a wire nut (cap it off if no other neutrals are present). Connect the bare copper to the switch's Green ground screw.
  8. Secure and Close: Fold the wires neatly into the back of the boxes (grounds first, then neutrals, then hots). Screw the devices to the boxes and install the faceplates.

The Most Common Botch: The Unbroken Tab and the Dead Short

The single most frequent failure in DIY switched outlet wiring is forgetting to snap off the brass connecting tab on the receptacle.

Symptom 1: The Switch Does Nothing

If you wire the black feed to the top brass screw and the red switch loop to the bottom brass screw, but leave the brass tab intact, the always-hot feed bypasses the switch entirely. Both halves of the outlet will remain constantly hot, and flipping the wall switch will yield zero result.

Symptom 2: The Loud Bang (Dead Short)

A far more dangerous botch occurs when a DIYer misidentifies the neutral wire. If you accidentally land the incoming White neutral on a Brass hot screw, and the incoming Black hot on the other Brass screw (with the tab intact), you have created a direct path from line to neutral with zero resistance. When you turn the breaker back on, you will hear a loud pop, see a flash, and the breaker will trip instantaneously. This can melt wire insulation and destroy the receptacle terminals. Always double-check that white wires only ever touch silver screws or other white wires.

Pro-Tip for Older Homes: If you are replacing an existing split receptacle in a home built before 2011, you may find a 14/2 cable used as a switch loop where the white wire is wrapped in black electrical tape. This was the old code-compliant method for a switched hot. If you encounter this, treat the taped white wire exactly as you would the red wire in the steps above. However, if you are pulling new wire, you must use 14/3 to provide a dedicated neutral at the switch box per NEC 404.2(A).

Verify and Test: Expected Multimeter Readings

Do not plug in expensive electronics until you have verified the circuit with a meter. Set your Fluke 117 (or equivalent) to AC Voltage (V~).

  1. Energize: Turn the 15A breaker back on at the panel. Ensure the wall switch is in the OFF position.
  2. Test Always-Hot: Insert the black probe into the bottom slot (neutral) of the top receptacle half, and the red probe into the top slot (hot). Expected Reading: 114V to 126V.
  3. Test Switched-Hot (OFF): Move the red probe to the hot slot of the bottom receptacle half. Expected Reading: 0.0V to 0.5V (ghost voltage).
  4. Test Switched-Hot (ON): Flip the wall switch to the ON position. Keep the probes in the bottom half. Expected Reading: 114V to 126V.
  5. Test Ground Fault Protection: If this is an AFCI/GFCI circuit, press the 'Test' button on the breaker or receptacle to ensure it trips, then reset it.

Code Caveats and Final Recommendations

When executing this project, keep two critical code requirements in mind to ensure your work passes inspection and remains safe.

First, Tamper-Resistant (TR) receptacles are mandatory in almost all residential living spaces per NEC 406.12. Do not buy cheap, non-TR receptacles to save a dollar; the internal shutters prevent children from inserting objects into the slots, and inspectors will flag non-TR devices immediately.

Second, if this outlet is located in a bedroom, living room, or hallway, the entire branch circuit must be protected by an AFCI (Arc-Fault Circuit Interrupter) breaker at the panel. Standard breakers will not protect against the parallel arcing that causes residential electrical fires. For deeper reading on residential arc-fault and ground-fault requirements, refer to the CPSC Electrical Safety guidelines.

Final Verdict: Stop guessing with outdated 2-wire switch loop diagrams. Purchase a spool of 14/3 NM-B, a Leviton 5262-SW TR receptacle, and follow the pigtail neutral method outlined above. It guarantees code compliance, provides a neutral for future smart switches, and eliminates the most common wiring hazards associated with split outlets.