Wire derating/branched circuit question

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nwhomesteader

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I'm wiring my shop with 3/4 emt and #10 wire. So my plan was to run a multi wire branched circuit from a double pole breaker. 2 hots and a nuetral.

I have half the shop done and have wired several junction boxes with 2ea 110v outlets. The left outlets off one leg and right outlets off the other leg with a shared nuetral. So basically 2 separate circuits in each box.

I intend on installing a few 220v outlets off the same circuit. The problem is that the 110 outlets are of course only rated at 20a so I can't run a 30a breaker to take full advantage of the #10 wire. Therefor I installed a 20a breaker. This will probably be fine for most tools but if I get a power hungry tool in the future, I may just run another set of #10's and a 30a breaker for dedicated 220.

It's a one man shop so there won't be multiple things run at once. My questions are: do I need to derate the dedicated 220 circuit from 30a to 25a if I run it in the same conduit as my branched circuit?

There would be 4 hot conductors and a single shared nuetral for the branched circuit.

And do you see any other issues I have missed? All outlets are individually grounded to the boxes and emt is continuous to the sub panel.

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