Originally Posted By: K447
The main precaution is to avoid close proximity to high voltage electrical wiring and away from potential lightening strike points.

Even a few inches distance between parallel electrical and ethernet cables may be enough to allow the network to work. The more spacing, the better.

Can't say I've ever had a problem with running power and Ethernet together before. I've had numerous installations where they all share the same cable tray or conduit. Common-mode rejection takes care of that.
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Cheers,

Andy M