re: Did some Ethernet wiring...

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If you run the cable properly interence isn't an issue.

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tell me you've never pulled cable through a crawl space without telling me you've never pulled cable through a crawl space.

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I've run unshielded cat5E across an MCC without issues, nothing in your crawlspace will put out more EMI than a 3-phase 480 MCC section.

But I will say there is no downside to running a shielded cable other than dealing with the cable itself. If I had it, I would use it.

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cat8 cables are literally $2.99 on amazon and if you type in 'cat6' or 'cat7' the first hitts are cat8

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price the highest grade you need for the job, then look at the next few higher grades and be willing to pay 5-10% more if it gets up a spec level or two (provided it works with what you have). Helps to future proof. Overkill ain't bad if you can afford it and no reason not to if it is cheap to move up. My only caveat is it can't make the installation a PIA compared to the spec you need.