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Do it right the 1st time. Don't try to get by with a 20 or 40 amp line. You said shop, you want lights and electric motors, you want power. What is available at your house? 100 amp, 200 amp? Where is your transformer/meter, on the house? You should be able to pull 60 or 100 amps real easy from a 200 amp service, you will need probably 2 sizes bigger than 'normal' wire for that distance - but look up any of the voltage drop calculators on the web or in an electric book. If you size the wire right you won't have over 3% voltage drop on the service, plus some drop in the shop so you will keep it under 5%. Probably a good idea to involve a pro to get the service set up, kinda major to get the ground & nuetral right as you will be using 4 wires to get there, and so on. For that distance aluminum wire will be cheaper even tho it will be much fatter; you need to use the right grease & connectors or the al will spark & loosen. You want an equal load on both legs, so you don't get dimming/ twitching lights in the house, etc. Pro can figure that out, get it all done once, and you can enjoy using your shop safely & for a long time. --->Paul
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