What size wire would I need to run a 100 amp subpanel 28 feet away? I have 6/3 wire would that do it?

  • This answer might be helpful.
    – Tester101
    Mar 19, 2016 at 19:22
  • 6 AWG copper is not large enough for 100 amperes.
    – Tester101
    Mar 19, 2016 at 19:23
  • This does seem like a duplicate question. Nothing against you Mel, it was cool to ask, it's a peculiarity of SE's format. Mar 19, 2016 at 20:16
  • You can feed a 100A panel with #6, you just cannot put that feeder on a 100A breaker. The panel size does NOT have to match the feeder/breaker size. What is this panel going to feed? Mar 20, 2016 at 0:15

1 Answer 1


Just to answer the question..

You'd need 4 (Hot, Hot, Neutral, Ground) #1 AWG wires.

  • 1 AWG supplies up to 110 amps
  • 6 AWG supplies up to 55 amps

If you use the 6 AWG, you could only feed the subpanel with a 50A breaker. Essentially making it a 50A subpanel. It's best to go ahead and get the most out of it if you can by using #1 wire.

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