250.122(B) Again

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Smart $

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Ohio
Not really...
I wasn't referring to his method. I was referring to actually quoting my post... i.e. post #14 ... and as if to correct ... which I corrected myself in post #15. He didn't elaborate, so I assumed it was to correct my error in post #14.

FWIW...

AWG sizes are proportional when using actual AWG gauge increments, not the commonly available or NEC listed sizes. For example, #12 to #10 is an increase of 2, not 1 gauge size... and is proportional to any span of 2 gauge sizes. Note the "ought" gauges increment by 1 also. If you do the math using cmil sizes given in NEC Chapter 9 Table 8, you will get rounding errors introduced by the significant figures and could end up being one size off. This may also happen when upsizing a combination of AWG and kcmil sizes.
 
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