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I did zero research before I bought the cable. Should I return it and get a fibre one?
Since you are putting it in duct you should be able to swap it out if it causes a problem so probably doesn't matter at this stage. Can you leave a draw rope in?
The trouble with fibre is it is likely to cost more both for the cable and the things to drive it at each end. It's also harder to work with if you aren't used to it. It's better but I don't know if it is actually needed.
I'd probably go with something like https://www.cablemonkey.co.uk/custom-fibre-pre-terms/13027-pre-terminated-fibre-cable.html
Not very helpful, sorry. I'm mostly watching you for ideas for what I'd like to do as I have a shed at the bottom of the garden that is falling apart. I'd like to replace it with something office/workshopy but I haven't really worked out what and I don't have your construction skills so it all gets fairly expensive.
Interesting. I'd have gone with fibre because I'm paranoid about differences in earth potential, partly from some old 10base2 installs that were a bit tingly. But I'm probably just paranoid.
Might depend on the earthing system in use.