A 3 prong dryer cord fits a NEMA 10-30R outlet: white neutral on the center screw, black and red hot legs on the two outer screws.
One crossed wire turns a ten-minute job into a service call. The sequence is short: center wire first, hot legs on the outside, cord clamped down before any screw is tightened.
Check the wall first. A 30A NEMA 10-30R outlet (three slots) takes a three-wire cord. A four-slot outlet needs a four-wire cord with its own ground conductor; a 3-wire cord will not seat in one.
Which Outlet Does A 3 Prong Cord Fit?
The 3-wire cord matches the 30-amp, 240-volt NEMA 10-30R, the older three-slot outlet still found in many U.S. laundry rooms. It carries two hot legs and a neutral, with no dedicated ground slot — which is why the dryer’s own ground wire is handled differently than on a four-wire hookup.
Look for the rating stamped into the outlet face or mounting strap. Three slots plus a 30A/240V marking is the match. Four slots means the cord is wrong — that is a NEMA 14-30R, which expects a fourth conductor.
Wiring The 3 Prong Dryer Power Cord
Wire order matters more than torque: white neutral to the center screw first, black and red hot leads on the two outer screws, strain relief clamped before anything is tightened. These steps follow LG’s 3-wire power cord installation guide.
- Cut the power. Flip the breaker OFF and set dryer controls to off.
- Open the terminal block. Remove the back cover plate. Behind it: three screws in a row and a green ground screw off to the side.
- Fit the strain relief. Thread a UL-listed strain relief into the cord opening and run the cord through it.
- Land the neutral. Leave a little slack inside the cabinet and put the white wire on the center screw before the outer two.
- Add the hot legs. Connect black and red to the two outer screws — either color on either outer post. Tighten until no strand can move.
- Move the dryer’s ground wire. Some dryers and local codes expect an external ground wire instead — check your manual.
- Close up and test. Tighten every screw, tug the cord to confirm the clamp holds, reinstall the cover, switch the breaker on.
| Wire Or Part | Where It Goes | What To Watch |
|---|---|---|
| White (neutral) | Center terminal screw | Connect this one first |
| Black (hot) | Left or right outer screw | Either outer post works |
| Red (hot) | The remaining outer screw | No loose strands under the screw |
| Dryer’s ground wire | Center screw, beside the white | LG’s relocation step — check your manual |
| Strain relief | Threaded into the cord opening | UL-listed and sized for the cord |
| Terminal block cover | Back over the terminals | Reinstall before power returns |
| Breaker | OFF at the panel | Verify dead with a tester |
Where 3-Wire Dryer Hookups Go Wrong
A third, quieter one is trusting a ground arrangement your dryer’s manual may not allow.
- The four-slot mismatch. A 3-wire cord will not fit a NEMA 14-30R, and adapter plugs are not a fix. Buy the four-wire cord.
- No strain relief. Terminal screws hold a conductor, not a swinging cord. Without the clamp, weight and drum vibration work wires loose, and a loose neutral on a 240-volt circuit scorches terminal blocks.
- Grounding assumptions. The center-screw move works on the dryers LG documents, but it is not universal. Codes vary by state and city, and some inspectors want an external ground wire from the dryer’s frame. Your manual outranks any general rule.
Cord clamps are cheap and cords are not, so replace a brittle or crushed cord rather than reusing it — our tested 3 prong dryer power cord picks cover lengths and gauges that fit a NEMA 10-30R plug.
FAQs
Can You Use A 3-Wire Cord On A 4-Slot Dryer Outlet?
No. A 3-wire cord’s plug will not seat in a four-slot NEMA 14-30R receptacle, and dryer makers reject the pairing. That outlet has a separate ground, so it needs a four-wire cord whose fourth conductor lands on its own terminal. Buy the cord that matches your outlet.
Does A 3-Wire Dryer Setup Need An Extra Ground Wire?
Not always, but sometimes. On many dryers, including LG-documented models, grounding is handled by relocating the appliance’s ground wire to the center terminal. Local codes and some manuals instead call for an external ground wire from the dryer’s frame. Your manual and inspector have the final word.
Can You Reuse The Dryer’s Old Power Cord?
Only if it is UL-listed, rated 30 amps at 240 volts, and free of cracks, melted insulation, or crushed ends. A cord stretched or pinched at the clamp has taken a beating. Any doubt, replace it — a new three-wire cord costs less than a scorched terminal block service call.
References & Sources
- LG. “LG Dryer — How to Install a 3-Wire Power Cord.” Source for the wire order, the center-screw ground relocation, and the 30-amp, 240-volt, 3-wire cord spec.
- Home Depot Appliance Repair. “Appliance Repair Manual.” Supports the strain relief requirement on dryer cord installations.