Question

What size wire do I need for a 200 amp service?

Answer 1

There is a difference, 1/O is one wire size larger.Nov 7, 2016

AWG 1 vs. AWG 1/0 | Sailboat Owners Forums

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For a 200 amp service, you will need to use a #4 AWG wire for copper conductors, or a #2 AWG for Aluminum or Copper-Clad Aluminum.