From http://www.dot.state.ak.us/anc/Engi...Construc tionStds/16120WireandCable.pdf
  • On 20A circuits, with one-way conductor lengths measured from panel to farthest receptacle, or center of lighting string (as applicable):
    1. #10 AWG for 120V circuits of 75 feet to 120 feet.
    2. #8 AWG for 120V circuits of 120 feet to 200 feet.
    3. #10 AWG for 277V circuits of 130 feet to 215 feet.
    4. #8 AWG for 277V circuits of 215 feet to 330 feet.





[This message has been edited by Bjarney (edited 02-06-2004).]