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1) In my opinion and as a former electrical inspector, a poor design by the project engineer or responsible party.
2) Since all circuits reside on the same phase and if the phase is lost for whatever reason, so much for putting all the eggs in one basket. Poor design decision. Circuits should have been spread out on other phases in order to minimize any potential losses if loosing one power phase.
3) Yes, I agree with you regarding potential problems caused by harmonics and/or EMI.
4) Personally, I would have installed the different circuits using separate raceways (UPS and branch circuit raceways) to minimize and/or reduce any potential harmonics or capacitive and/or inductance issues. A local electrical inspector may consider and by code interpretation that the UPS circuits are emergency circuits or control circuits and should not be inter-mixed with branch circuits within the same raceway. Local electrical codes always have the final say so. I recommend to run this past the local electrical inspector.
5) Conduit fill ratio also needs to be taken into consideration as well as conductor deratings due to the quantity of conductors in the raceway.
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