Different voltages in one conduit UPS hook up

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Scali

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Location
LA,CA
Hi,
Running a 150Amp 480v circuit to a disconnect then to the UPS and then out from the UPS comes out 480v goes back through the same disconnect into the same conduit back to the 480v panel and out the side to feed a transformer.
Would it cause any problems for current going in different directions in the same conduit? and what if the going back current was 208v.
I don't see a problem in doing this as they will still cancel each other out, my friend here thinks other wise

Your thoughts
 
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