How to Wire a 240 Volt Portable Generator Plug

Written by richard asmus
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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.

Skill level:

Things you need

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

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  1. 1

    Remove the screws from the plug and remove the cover.

  2. 2

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

  3. 3

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

  4. 4

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

  5. 5

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

  6. 6

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

  7. 7

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

  8. 8

    Replace the cover and tighten the screws with a screwdriver.

Tips and warnings

  • 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.

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