DC power wiring in with AC power wiring?

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IL94EE

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Fairview Heights, IL
I'm the EE who did the design work for a small college physics lab renovation project. There are several "island" lab workstations which are to have 120V receptacles to power test equipment, and also banana jack type terminals for 0-150V DC to supply power for the experiments being performed. Since it's a renovation, the conditions are requiring the wiring to be run in low-profile over-floor raceway. I've called for a separate raceway each for the DC and AC power wiring, and another for data cables. The contractor wants to use a different product with multiple channels in one housing (nicer looking installation), but it would require the DC and AC power wiring to be in the same channel, data cables in a different one. He thinks it's OK since both the AC and DC wiring will be THHN and therefore the same voltage class insulation. My gut says and I want to say no, but so far I haven't found the "right" code references to say so. Probably right under my nose and I just can't find it, but I'd appreciate any help as to whether or not this can be done.
 
The DC and AC together are fine by code. See 300.3(C)(1). Only time this isn't allowed is when the DC are photovoltaic source or output circuits.

Whether there will be functional problems (i.e. signal interference) on the DC circuits is another question. The code isn't intended to prevent that.
 
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