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How to Wire a 240 Volt Portable Generator Plug

Updated February 21, 2017

The standard 240-volt portable-generator plug is a four-wire NEMA L14-30 plug that can be found in most hardware stores. The four wires consist of two "hot" wires (which are normally black but are sometimes red); a "neutral" wire (normally white); and a ground wire (usually green). To make your installation easier, check your generator owner's manual to ensure that a NEMA L14-30 will fit.

Remove the screws from the plug and remove the cover.

Use the knife to remove the outer covering on the cable, so the four inner wires are 1 1/2 inches in length.

Use the wire strippers to strip a half-inch of insulation off each of the four wires.

Loosen the screw connectors on each of the four prongs of the plug with a screwdriver.

Place the black wires under the screw connectors on the "hot" prongs and tighten them with a screwdriver.

Place the white wire under the screw connector on the "neutral" prong and tighten it with a screwdriver.

Place the green wire under the screw connector on the "ground" prong and tighten it with a screwdriver.

Replace the cover and tighten the screws with a screwdriver.

Tip

A diagram of a NEMA L14-30 plug is available on Page 10 of the first article listed under "References." A picture of a NEMA L14-30 is available on the second reference article.

Things You'll Need

  • Four-conductor standard electrical cable
  • NEMA L14-30 plug
  • Knife
  • Wire stripper
  • Screwdriver
  • Ruler
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About the Author

Richard Asmus was a writer and producer of television commercials in Phoenix, Arizona, and now is retired in Peru. After founding a small telecommunications engineering corporation and visiting 37 countries, Asmus studied broadcasting at Arizona State University and earned his Master of Fine Arts at Brooklyn College in New York.