Things You'll Need
Four-conductor standard electrical cable
NEMA L14-30 plug
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.
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.
Wire the Plug
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.
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.