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I presume any mains power is already running through separate conduit.
How long is the cable run? USB has much shorter limits than GigE.
If you are running solid core Cat6 for your GigE, have you considered running your USB over that too? The USB to Gig converters aren't cheap but you would eliminate crosstalk and power drop in the USB.
Also pulling one cable through a duct is easier than two, especially if you have to replace one at some stage.
If you were worried about lightning, you could use fibre between the switches.
Andrew
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