I always run 20 amp outlets and circuit breakers. A lot of tools run at 15 amps, especially at start up, you are right at the limit with a 15 amp outlet or breaker.
Also, if you are not going to run a separate breaker just for lights, you will be running your lights from from a hot wire coming out of one of your outlets. that means that you will have to take into account that you may be running a power tool as well as lights off the same circuit, you can eliminate problems
by going with larger breakers and outlets.
You should run #12 from the breakers to the outlets and light switches, #12 can easily handle 20 amps. Larger wire such as #10 or larger is much harder to bend and attach to the screws on the outlets.

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steves, you may wanna check your area's electrical code as well, god forbid sumthing happends (fire ) if the job isnt done to code your ins. co. wont cover you.

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I was looking at the lowes website earlier today, i didn't realize I could get a small load center for around $20 that will give me room for 4 or 5 breakers, which honestly is more than what I need for my application.

I'll certainly check into the code issues too... I might not even get to this project for a few more months.

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You haven't mentioned lights or heat. What are you going to power those with?

Also, I suggest you trench and run direct burial cable.

I agree that 30AMP is more practical than only 20 amps. Is this to be a 220v circuit or a 110v circuit? For running power tools, 220v is better because of the need for lower ampreage.

Red

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I'm sure I mentioned lights, and that's why we ended up at the load center idea.

I just called a friend locally who suggested I run 6-2 on a 30amp double pull breaker to the subbox in the shed.

Looks like this project is getting priced into next year....

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01 Suzuki 600 GSF
88 Fiero 2M4