Cable calcs for right size cable

Hey guys as some of you may know that I'm studying electrical installation at York college. I haven't really worked on site yet.

Just wanted abit of help. As I'm doing cable calls etc which I've got the hang off.

Only issue I have is suggesting improvements as to smaller cable. Etc. Plus I don't know what the cable size means 🙁 as in if their too big for a domestic property or wherever we doing the calculations for.

Is there anywhere I can make myself familiar with cable sizes. So I can say this cable is too big etc especially based on ref method etc.

Otherwise I won't know. Just need to understand what the standard sizes should me .

Thanks for any help

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