I couldn't find in section 408 that talkes about breakers on the left are odd numbered and the breakers on the right are even numbered. Is this a code requirement?

I installed a subpanel from SQUARE-D that had the option of being installed with the Main lugs down or up. So I installed it the way that was convenient for the existing wiring and the existing feeder. Then when i installed the cover the upper left breaker was #12, upper right breaker was #11.

408.3(E) is phase arrangement only, i didn't see anything in 240 or 404. the only issue i find is with 110.3(B) which i should be O.K.

Is this a violation of NEC?


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