I would like to know if using two 2.5mm² cables has a greater current rating than one 6mm² cable. The ratio of CSA is 2.4x and so I would have expected to need three 2.5mm² cables. However, I then looked at the actual current ratings tables for different cable sizes and see that 2.5mm² is rated at 18.5A while 6mm² is only at 32A. Hence presumably two 2.5mm² cables would have a joint rating of 37A and so exceed the 6mm² cable.
I have read other posts that the deciding factor is the amount of copper, which would suggest that three 2.5mm² cables are needed.
However based on the current rating tables, only two cables are needed.
So I don't understand why the tables contradict the advice in posts on this site. I would like to know if I have understood the tables correctly, or if my logic is flawed.
Also, my cable is single strand. Should I use multiple strand, as this seems to be used in the tables?