Reply To: [OT] – Linking phases by powerline…

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#44397
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Andreas
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Its not a matter of the phase but of the grounds. Ethernet signals itself are completely isolated but if you’re running a shielded (STP) cable a ground loop will be established. Pretty the same with transformer based DI boxes and the ground lift switch.
If you have to go a long distance I’d probably use a shielded cable with a short unshielded patch cable on one end. But be aware of different ground levels which may be uncomfortable to touch by hand…