re: Long Ethernet run, patch cable question

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Don't think that's true for DC.

According to the AWG chart, resistance depends on total cross-sectional circular area, not total strand "skin" surface area.

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Electrons are the same for both DC and AC. They don't behave any differently.

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It isn't a theory. it is a fact.

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The skin effect is a real thing. I was referring to your theory that a stranded conductor in category cable has less resistance than a solid one.

Once again, per the AWG chart, resistance is inversely proportional to the total strand cross-sectional area, NOT the total strand surface area.

Example:
4AWG solid conductor has a surface area of 1*(0.2043*pi)*12" = 7.7 square inches per foot of length.

4AWG stranded conductor has a surface area of 259*(0.0126*pi)*12" = 123 square inches per foot of length.

Nearly 16 times more surface area vs. solid, yet resistance is the same.

Or, if you think only the exposed surface area matters, then stranded has a minimum of 1*(0.2650*pi)*12 = 10 square inches per foot of length, though it's much higher due to the individual strands.

Still, a minimum of 30% more surface area, same resistance. Why? Because the cross-sectional area of stranded is 41,119 cmils vs 41,740 cmils for solid, a difference of only 1.5%.

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and yes, it is more applicable for AC and not as much DC but communication cables are not strictly DC. They have alternating signals down them. DC means steady voltage with no fluctuation. Once you start fluctuating DC voltages they will behave more like AC currents.

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Do you have a link detailing how this applies to category cable used for ethernet? Or can you explain why literally every single recommendation which says solid conductors are better for longer runs is wrong? The link you provided even says the skin effect is negligible when the diameter is less than 1cm.

I really don't get why you're pushing this so hard.

$28 on Amazon

This would accomplish what you're trying to do.

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Electrons are the same for both DC and AC. They don't behave any differently.

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The electrons are the same, but they do behave a little differently. In DC they flow from Negate to Positive, in AC they cycle back and forth at the frequency of the alternator.

This did turn into a shite thread.

Buy a patch cable, any patch cable. Make your own, if you want. You will be fine at 100 feet solid or stranded.

Not necessary. What is much more important would be using cable rated outdoors and install it in a conduit. I’d also run CAT6 but only because it’s pretty cheap. CAT7 makes zero sense.