Why do people uprate cable when it's not required?

[philectrical]

Just sat looking at my old cooker that's sat in my kitchen with a piece of 6mm2 hanging out of it.

Its info plate in the door says it pulls a max of 5.3kw, which using P/V gives us 23a which means it could easily be put on 32a and 4mm, or 25a and 2.5mm no?

Yet it was on 6mm and a 45a breaker.

Just wondering why or if i've got something wrong here.

 

[Lister1987]

Let's not forget Appendix 17 to consider too

 

[Welchyboy1]

Is that the same reason you fit 1.5 3c & e as legs of a rfc instead of 2.5 t&e….. or was that a genuine mistake?

Ha lol! Done that one in a rush before

 

[telectrix]

Is that the same reason you fit 1.5 3c & e as legs of a rfc instead of 2.5 t&e….. or was that a genuine mistake?

never in my life have i made that mistake. only stock 1.0mm 3c/E anyway.