How to Wire Electrical Outlets | The Right Way, Safely

For the full breakdown, see our best Electrical Outlets guide.

Wiring a standard 120-volt duplex receptacle is a straightforward job once you understand the color-coded screws, and learning how to wire electrical outlets correctly comes down to three connections and one safety habit. You might be replacing a cracked outlet or adding a new one in a workshop; either way, the process is the same.

Wiring An Outlet: What You Need Before You Start

Before you touch any wire, turn off the correct breaker and confirm the outlet is dead with a voltage tester. You also need a standard screwdriver, needle-nose pliers, and a wire stripper.

• Non-contact voltage tester or multimeter to verify the circuit is off
• Phillips and flat-head screwdrivers for the cover plate and mounting screws
• Needle-nose pliers for forming wire hooks
• Wire stripper, or the strip gauge built into the receptacle

Take a photo of the existing wiring before you disconnect anything. If the old conductor ends are nicked or charred, trim them back to clean copper before proceeding. This guide covers standard duplex receptacles on typical residential branch circuits; half-hot, switched, GFCI, and 240-volt outlets follow different rules.

Which Screw Gets Which Wire?

The brass screw is hot, the silver screw is neutral, and the green screw is ground. Matching them correctly is the whole secret to safe wiring.

1. Strip about 3/4 inch of insulation from each wire, or follow the strip gauge printed on the receptacle.
2. Form a clockwise hook in the wire end with needle-nose pliers. The hook should wrap around the screw so tightening it closes the loop.
3. Hook the black wire under the brass screw, the white wire under the silver screw, and the bare wire under the green screw, then tighten each screw firmly.
4. Tuck the wires neatly into the box and secure the receptacle with the mounting screws.

Common Mistakes That Cause Outlet Failures

• Reversing hot and neutral is the most serious mistake; the outlet still works but leaves parts of the device energized.
• A counterclockwise hook loosens as you tighten the screw; always loop clockwise.
• On back-stab connections, bare copper extending too far can short against the box or the other terminal.
• When two wires share a terminal, wire them together with a pigtail instead of stacking them.