What size wire to use from house to wood shop?

Question

What type/size of wire should I use for running power from the 200Amp service panel at my house to a subpanel at my wood shop? The length of the run is 300 feet. I need 220V service at the shop and would like to run a 70 amp circuit. I would like the wire to be direct burial, +/- 2 ft deep. Voltage drop limit is 3%.

I was told that I could use #1 THHN copper wire in conduit OR aluminum wire rated for a 100 amp circuit, but was not given a gauge/type of aluminum wire.

What size wire should I use?

This answer, this answer, and this answer might be helpful. – Tester101 Dec 30 '14 at 01:43 — Tester101, Dec 30 '14 at 01:43

score 1 · Accepted Answer · answered Dec 29 '14 at 22:13

1

Here's a good calculator that will answer your question.

It says #1 copper, 2/0 for aluminum.

answered Dec 29 '14 at 22:13

Eric Gunnerson

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What size wire to use from house to wood shop?

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