That's because lots of them have been taught crap in the first place. I really do think that basic electrical theory isn't taught enough, declining in favour of following the dumbed down publications like the On Site GuideCertainly a C3 not a danger overloading the cable any time soon, some crap gets written on this site and it seems to be the same people, what some people are advocating is that should be C2 and fail, just nonsense