Derating

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right, So in my example I am running recepts and lighting circuits. to be clear , I need to pull 15 CCC's #10 thhn in a 1 inch emt to be able to use a 20 amp ocpd. and if as I was told to pull 15 CCC's #12 thhn I would be forced to use a 15 amp ocpd. since 50% of a #12 thhn is 15 amps?

I thought i was correct with my first statement here about the #10's until I spoke with an "engineer" who brought up the calculated load. that did not make sence to me, So I came here for the answer.
 
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