How to Wire a Split Receptacle Controlled by a Switch: Half-Hot Guide

The Direct Answer: Wiring a Split Receptacle (Half-Hot)

To wire a split receptacle controlled by a switch—commonly called a half-hot outlet—you must physically break the brass connecting tab on the hot side of the duplex receptacle while leaving the silver neutral tab intact. You then run a 3-wire cable (Black, Red, White, Bare) from the switch box to the receptacle box. The black wire lands on the top brass screw for continuous power, the red wire lands on the bottom brass screw for switched power, the white wire lands on the silver screw for the neutral return, and the bare copper wire lands on the green ground screw.

This configuration assumes a standard US 120V nominal residential branch circuit, copper conductors, and a modern NEC-compliant switch loop where the neutral is present at the switch box. Below is the complete decision path, material list, and termination sequence to execute this safely and correctly.

Decision Path: Wire Gauge and Device Ratings

Your wire gauge and receptacle rating are strictly dictated by the overcurrent protective device (breaker) sizing the circuit. Do not mix 14 AWG wire on a 20A breaker, and do not install a 15A receptacle on a 20A circuit unless it is a multi-receptacle branch circuit (per NEC 210.21(B)(3)). For a dedicated half-hot setup, match the components exactly using this matrix:

Default Recommendation: If you are adding this to an existing standard bedroom or living room lighting/outlet circuit, you are almost certainly working with a 15A breaker and 14 AWG wire. Purchase the 14/3 NM-B cable and the Leviton 5262-SW 15A receptacle.

Tools and Materials List

• Cable: 14/3 NM-B (for 15A circuits) or 12/3 NM-B (for 20A circuits). The "3" indicates three insulated conductors (Black, Red, White) plus a bare ground.
• Receptacle: Standard duplex 15A or 20A receptacle with break-away brass and silver fins (e.g., Leviton 5262-SW).
• Switch: Standard single-pole 15A/20A toggle or rocker switch (e.g., Leviton 1451-W).
• Wire Strippers: Klein Tools 11055 (handles 10-18 AWG solid/stranded).
• Pliers: Lineman's pliers or heavy-duty needle-nose pliers for snapping the break-away tab.
• Tester: Non-Contact Voltage Tester (NCVT) and a CAT III digital multimeter (e.g., Fluke 117).
• Connectors: In-Sure push-in wire connectors or standard wire nuts (ideal for 14 AWG: grey/yellow; for 12 AWG: yellow/red).

Mandatory Mains Safety Protocol

Step-by-Step: Switch-to-Receptacle 3-Wire Run

This procedure assumes power (the line feed) enters the switch box first, and you are running a new 14/3 NM-B cable from the switch box to the receptacle box. This satisfies modern NEC requirements for a neutral at the switch.

1. Prepare the Cable Ends: Strip 3/4 inch of insulation from the ends of the black, red, and white wires using the 14 AWG hole on your wire strippers. Leave the bare copper ground wire at 1/2 inch of exposed length.
2. Break the Brass Tab (Receptacle): Locate the brass-colored screws on the hot side of the duplex receptacle. Between the top and bottom brass screws, there is a small brass connecting fin (tab). Grip this tab firmly with your needle-nose pliers and bend it back and forth until it snaps off completely.
   Pro-Tip: Never break the silver tab on the neutral side. The neutral must remain continuous so both the top and bottom halves of the outlet can return current to the panel.
3. Terminate the Receptacle (Hot Side): Loop the Black wire (always hot) clockwise around the Top Brass screw. Tighten to 0.5 lb-in (or until the screw head is snug and the wire cannot be pulled free). Loop the Red wire (switched hot) clockwise around the Bottom Brass screw and tighten.
4. Terminate the Receptacle (Neutral & Ground): Loop the White wire (neutral) clockwise around either Silver screw (since the silver tab is intact, they are electrically identical). Loop the Bare copper wire around the Green ground screw at the bottom of the yoke.
5. Terminate the Switch (Line and Load): At the switch box, connect the incoming Black line wire to the Bottom Brass screw on the single-pole switch. Connect the Red wire (the load leg running to the receptacle's bottom half) to the Top Brass screw on the switch.
6. Terminate the Switch (Neutral and Ground): Connect the incoming White neutral wire to the White wire of the 14/3 cable using a wire nut or push-connector. This passes the neutral through to the receptacle without landing it on the standard toggle switch. Connect all Bare ground wires together with the switch's Green ground screw pigtail.

Verify and Test: Expected Meter Readings

Do not push the devices back into the drywall boxes until you have verified the circuit logic. Restore power at the breaker panel and set your multimeter to AC Voltage (V~).

If your readings match the table above, de-energize the breaker one last time, neatly fold the wires into the boxes (ground wires pushed to the back, neutrals folded in the middle, hots folded last), secure the devices with their mounting screws, and install the cover plates.

The Most Common Botch and Its Symptom

The Botch: Forgetting to break the brass connecting tab on the receptacle.
The Symptom: Both the top and bottom halves of the receptacle turn on and off with the wall switch, or the breaker trips immediately upon being reset.

The Physics of the Failure: If the brass tab remains intact, the top brass screw and bottom brass screw are electrically bonded. By landing the always-hot black wire and the switched-hot red wire on these screws, you are paralleling the unswitched feed with the switch's load terminal. When the switch is in the OFF position, the 120V from the black wire travels through the intact brass tab, backward up the red wire, and energizes the switch's load terminal. While this might just result in both halves acting as "always hot" in a simple single-feed setup, it becomes catastrophic if the black and red wires are fed from a Multi-Wire Branch Circuit (MWBC) on opposite phases. In an MWBC scenario, leaving the tab intact creates a 240V dead short across the two phases, instantly tripping the breaker and potentially welding the pliers to the screw if you are testing it live.

The Secondary Botch: Accidentally breaking the silver (neutral) tab.
The Symptom: The top half works perfectly, but the bottom half is completely dead regardless of the switch position. The switched hot (red) is delivering 120V to the bottom receptacle, but because the neutral tab is broken and the white wire is only landed on the top silver screw, there is no return path to complete the circuit for the bottom half.

NEC Code Context: The Neutral at the Switch Rule

Historically, electricians wired half-hot receptacles using a 2-wire cable (14/2 NM-B) as a "switch loop," where the white wire was re-identified as black and used to carry the always-hot feed down to the switch, and the black wire carried the switched hot back up. This left the switch box with no true neutral wire.

Under NFPA 70 (National Electrical Code) Article 404.2(C), switch loops controlling lighting loads now require a neutral conductor to be present at the switch location. This was implemented to accommodate smart switches, occupancy sensors, and timers that require a small amount of standby current to operate their internal Wi-Fi or logic boards. By running a 14/3 NM-B cable as outlined in this guide, you provide the black (always hot), red (switched hot), and white (neutral), ensuring full compliance with modern NEC switch loop requirements while safely splitting the receptacle.

For further reading on residential electrical safety and grounding requirements, refer to the OSHA Electrical Safety guidelines, which detail the hazards of improper grounding and the necessity of verifying dead circuits before making terminations.