Posted by RJKeith on October 08, 2023 at 18:45:39 from (54.227.69.215):
In Reply to: Outbuilding wire posted by waugh621 on October 08, 2023 at 09:59:55:
John T offers good advice. You are trying for 3% drop or less. In general, a #2 wire aluminum or a #3 wire copper will be OK for 100 amps, you usually don't need to upsize until you go beyond 100 feet. Copper is more expensive but is bullet proof, very tough to mess up the installation. For aluminum, if you stress the wire, incorrectly torque the connection, fail to use the right connectors, or fail to use the correct compound, chances are the wire will fail. Might want to get an electrician who does aluminum regularly to help. Don't direct burry aluminum, anything going over the wire that stresses it can cause a failure. If you do use aluminum, put it in conduit. I would recommend conduit for copper as well. Sched 40 PVC conduit is cheap and will protect the wire from soil compaction and soil movement, lessening the likelihood of failure.
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