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Thanks for asking.

In my view, if it's something you'd first think of asking an electrician, it's probably off topic here.  That includes what type of cable to use, whether it should be in a conduit or not, working with breaker panels, what size wire is needed for a particular application, etc.  This particularly includes electric code issues.  Electricians have to know the code, but there is no particular reason an electrical engineer would know.

Acceptable questions here need to be about EE or the technology or physics behind it.  Put another way, when it comes to home wiring we're about the <i>why</i>, not the <i>what</i>.

If you want to know what size wire to run 20 m to a 15 A outlet, ask an electrician.  The answer in that case may be more about legal requirements than anything electrical anyway.  But, you could ask here how to determine what voltage drop you would get, how much power that would lose, etc.

You could also ask what requirements a cable would need to have to carry 100 Mb ethernet, the advantages and disadvantages of different cable types, etc.  If an electrician would answer <i>"I don't know, I don't have to, I just do what the code says."</i>, then it's more likely to be on topic here.  But then it's not about what to do or install, but the technology behind it, what the tradeoffs are, etc.