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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?

Niall C.
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Chandler
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  • [This answer](http://diy.stackexchange.com/a/41972/33), [this answer](http://diy.stackexchange.com/a/49705/33), and [this answer](http://diy.stackexchange.com/a/29077/33) might be helpful. – Tester101 Dec 30 '14 at 01:43

1 Answers1

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

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

Eric Gunnerson
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