Concerning the requirement to not mix voltages in conduit, I tend to think that it is OK to run, say a dryer circuit with a laundry circuit in the same conduit (assuming all other codes requirements are met), being all the same potential to ground, but another opinion by another EC was that it would be a violation.

Besides, 300.3(C)(1) says its OK, don't it?

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-Virgil
Residential/Commercial Inspector
5 Star Inspections
Member IAEI