What size wire should I use for 100 amp service with ambient temp of 75 degrees Far? [Archive]

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tspitzer6

Mar 2, 2010, 01:10 PM

I have ran a 1 1/4 inch conduit a distance of 75 feet to a sub-panel. What size awg thhn wire should I use to connect to it? Our ambient temp is 75 F.

tkrussell

Mar 2, 2010, 01:24 PM

3- #3 copper or #1 aluminum. You will also need one # 8 CU or a #6 Al for equipment ground.
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