Wiring a Receptacle and Switch Correctly

Know your three wires

Almost every device connects the same three conductors: hot, neutral, and ground. On a standard receptacle, the hot lands on the brass screw, the neutral on the silver screw, and the ground on the green screw. Get those three assignments right and you are most of the way there.

The narrow slot is hot, the wide slot is neutral, and the round hole is ground. Reversing hot and neutral is a common and dangerous mistake that a plug tester catches instantly.

Make solid connections

A loose connection is a future fire. Strip the right amount of insulation, hook the wire clockwise around the screw so tightening pulls it in, and torque the screw firmly to the device's spec. Loose terminals cause arcing, which is exactly what AFCIs are fighting.

• Use terminal screws or listed back-wire clamps, not the cheap push-in stab holes.
• Pigtail multiple wires together rather than relying on a device to pass current through.
• Torque to spec; guessing is a leading cause of loose-connection failures.

Wiring a single-pole switch

A single-pole switch simply interrupts the hot conductor going to a light. Bring the hot in, out to the fixture, and the switch breaks that line. The neutral does not connect to a basic switch, but newer rules require a neutral present in most switch boxes so smart switches can be added later.

If you use a white wire as the switched hot in a loop, re-identify it with tape or marking so nobody mistakes it for a neutral down the road.

Finish it clean and safe

Add the required protection for the location: GFCI in wet areas, AFCI in living spaces, or dual-function where both apply. Tamper-resistant receptacles are required in dwellings. Fold the wires neatly into the box, seat the device square, and confirm you left enough conductor length.

Before you close up, test with a plug tester and a GFCI test. Two minutes of testing beats a callback and proves your work to the inspector.