How to Wire a Switched Outlet Diagram: Step-by-Step Guide

A switched outlet (often called a half-hot or split-wired receptacle) allows you to control one half of a standard duplex outlet with a wall switch while keeping the other half constantly powered. For a standard living room or bedroom lamp setup, the direct answer is to use a 15A Tamper-Resistant (TR) duplex receptacle, wired with 14 AWG NM-B cable on a 15A AFCI breaker. The black wire provides constant power to the top half, the red wire provides switched power to the bottom half, and the brass break-off fin on the hot side must be removed.

This guide walks through the exact wiring topology, terminal assignments, and verification steps to get the job done safely and to code.

The Decision Path: Which Switched Outlet Configuration Do You Need?

Before stripping any wires, you must match your configuration to the room's electrical requirements. The National Electrical Code (NEC) treats kitchen countertops differently than living rooms.

Understanding the Wiring Topology (Power at Switch)

The cleanest and most common way to wire a switched outlet is to bring the main power into the switch box first, then run a 3-wire cable to the outlet box. This topology requires:

• 14/2 NM-B: Runs from the breaker panel to the wall switch (carries Line, Neutral, Ground).
• 14/3 NM-B: Runs from the wall switch to the receptacle (carries Always-Hot, Switched-Hot, Neutral, Ground).

If your power enters at the outlet box instead, the wiring logic changes significantly, requiring a 14/2 cable to feed the switch and return the switched leg. For this guide, we are executing the Power-at-Switch topology, as it is the standard for new construction and retrofits.

Tools, Materials, and Device Ratings

Using the correct gauge and rating is non-negotiable. A 15A device can be used on a 15A or 20A breaker, but a 20A device must only be used on a 20A breaker.

Materials:

• 15A Tamper-Resistant (TR) Duplex Receptacle (e.g., Leviton T5262)
• 15A Single-Pole Toggle or Rocker Switch (e.g., Leviton 1451)
• 14/2 NM-B Cable (Power feed)
• 14/3 NM-B Cable (Switch leg to outlet)
• Red, yellow, and grey wire nuts (rated for 14 AWG solid copper)

Tools:

• Non-Contact Voltage Tester (NCVT)
• Digital Multimeter (CAT III rated)
• Wire strippers with 14 AWG and 12 AWG holes
• Phillips #2 screwdriver and flathead screwdriver
• Needle-nose pliers for forming J-hooks
• Lineman's pliers for twisting grounds

Mains Safety Protocol: De-Energize and Verify

1. Turn off the breaker: Locate the correct 15A or 20A breaker in your main panel and switch it to the OFF position.
2. Initial sweep: Use your Non-Contact Voltage Tester (NCVT) on a known live circuit to verify the tester's battery is working, then test the target outlet and switch.
3. Multimeter verification: Set your multimeter to AC Voltage (V~). Insert probes into the top and bottom slots of the outlet (Line to Neutral). The reading must be 0.0V. Test Line to Ground as well. If you read anything above 3V, stop immediately; you have the wrong breaker or a backfed circuit.

Step-by-Step: Wiring the Half-Switched Receptacle

The receptacle requires splitting the hot side while keeping the neutral side bonded. According to CPSC guidelines on Tamper-Resistant receptacles, TR shutters require firm, straight pressure to insert plugs, so ensure your wires are seated deeply to keep the device flush against the drywall.

1. Prep the 14/3 wires: Strip exactly 3/4 inch of insulation from the black, red, white, and bare copper wires. Use needle-nose pliers to form a tight clockwise J-hook on the end of each insulated wire.
2. Break the brass tab: Locate the small metal break-off fin connecting the two brass (hot) screws on the side of the receptacle. Use your lineman's pliers to snap this fin off. Leave the silver (neutral) side fin completely intact.
3. Terminate the Always-Hot: Hook the Black wire from the 14/3 cable around the top brass screw. Tighten until the wire is snug and the insulation sits just outside the screw head (target torque: ~14 in-lbs).
4. Terminate the Switched-Hot: Hook the Red wire from the 14/3 cable around the bottom brass screw. Tighten securely.
5. Terminate the Neutral: Hook the White wire from the 14/3 cable around either silver screw. Because the silver tab is intact, both halves of the outlet will share this single neutral return path.
6. Terminate the Ground: Loop the Bare copper wire around the green grounding screw at the bottom of the yoke and tighten.

Step-by-Step: Wiring the Wall Switch

At the switch box, you will manage the incoming power and the outgoing 14/3 cable. Single-pole switches do not have a designated 'Line' or 'Load' terminal; either brass screw can accept the incoming hot or the outgoing switched hot.

1. Splice the Neutrals: Connect the White wire from the incoming 14/2 cable to the White wire of the outgoing 14/3 cable using a grey or red wire nut. Do not connect the neutral to the switch itself. Push this bundle to the back of the box.
2. Pigtail the Always-Hot: Cut a 6-inch piece of 14 AWG black wire (pigtail). Strip both ends. Connect one end to the incoming Black wire (14/2) and the outgoing Black wire (14/3) using a yellow wire nut. This sends constant power directly to the outlet's top half.
3. Wire the Switch Line: Connect the other end of your black pigtail to the bottom brass terminal on the single-pole switch.
4. Wire the Switch Load: Connect the Red wire from the outgoing 14/3 cable to the top brass terminal on the switch. This carries the switched power to the outlet's bottom half.
5. Splice the Grounds: Twist the bare ground from the 14/2, the bare ground from the 14/3, and a 6-inch bare copper pigtail together. Cap with a green wire nut. Connect the other end of the pigtail to the green ground screw on the switch yoke.

Verify and Test: Expected Meter Readings

Before pushing the devices into the wall boxes and installing the faceplates, you must verify the circuit logic. Turn the breaker back ON at the panel.

1. Switch OFF: Set your multimeter to AC Voltage. Measure from the top brass screw (Always-Hot) to the silver screw (Neutral). Expected reading: 120V (acceptable range 114V-126V). Measure from the bottom brass screw (Switched-Hot) to Neutral. Expected reading: 0V.
2. Switch ON: Toggle the wall switch. Measure from the bottom brass screw to Neutral again. Expected reading: 120V.
3. Neutral-to-Ground Check: Measure from the silver screw to the green ground screw. Expected reading: < 2.0V (ideally under 0.5V). A reading higher than 3V indicates a loose neutral connection or a shared-neutral overload upstream.

The Most Common Botch and How to Avoid It

The single most frequent mistake DIYers make when wiring a split receptacle is failing to break the brass break-off fin on the hot side of the receptacle.

The Symptom: You wire the black wire to the top screw and the red wire to the bottom screw. You turn the breaker on, and both halves of the outlet are constantly powered. The wall switch does absolutely nothing. Because the brass tab is still intact, the constant 120V from the black wire bleeds directly over to the bottom brass screw, overriding the switched red wire entirely.

The Secondary Botch (Worse): Accidentally breaking the silver (neutral) tab while leaving the brass tab intact. If you do this, the bottom half of the outlet will have no neutral return path. The lamp plugged into the bottom half will simply not work, and you will spend hours troubleshooting a 'dead' switch leg when the actual failure is an open neutral. Always double-check your pliers: snap the brass side, leave the silver side alone.

By following this exact topology, respecting the 14 AWG / 15A device ratings, and verifying your voltages before closing up the boxes, your switched outlet will operate safely and reliably for decades.