How to Wire a NEMA 14-30R

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Modern dual-voltage clothes dryers often plug into a NEMA 14-30R.
Modern dual-voltage clothes dryers often plug into a NEMA 14-30R. (Image: laundromat image by Scott Patterson from Fotolia.com)

A modern dryer that uses 125 volts for its controls and 250 volts to power the heating element plugs into a NEMA 14-30R. A NEMA 14-30R, a 30-amp 125/250-volt 3-pole 4-wire grounded receptacle, has a 2 1/8 inch diameter face and mounts in a standard residential electrical box. The plug that fits into a 14-30R has two straight-blade hot prongs, one L-shaped neutral prong (the bottom prong) and a horseshoe-shaped ground prong (the top prong).

Things You'll Need

  • Wire strippers
  • Pliers
  • Flat-head screwdriver

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Turn off the NEMA 14-30R's circuit breaker. This circuit breaker usually uses a "Dryer" label.

Remove and discard the last 3/8 inch of the insulation on the wires that will connect to the NEMA 14-30R with wire strippers. Some wire sets use four insulated wires, and some wire sets use three insulated wires and one without a coating.

Grip the middle of the striped end of a wire with a pair of pliers and bend it into a hook. Repeat this on each wire.

Find the NEMA 14-30R's terminal identification letters above each terminal. A NEMA 14-30R uses the letters "G," "W," "X" and "Y."

Loosen the NEMA 14-30R's four terminal screws with a flat-head screwdriver.

Hook the ground wire on the NEMA 14-30R's "G" screw. Tighten the screw with the flat-head screwdriver. The ground wire uses green insulation, green and yellow striped insulation or no insulation at all.

Hook the neutral wire over the NEMA 14-30R's "W" screw. Tighten the screw. Neutral wires have white colored insulation.

Hook the hot wire with black insulation on the NEMA 14-30R's "X" screw. Tighten the screw. Choose either black wire if the wire set contains two wires with black insulation.

Hook the last wire on the NEMA 14-30R's "Y" screw. Tighten the screw. The remaining wire, the second hot wire, has either a red or black covering.

References

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