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- My first reaction is always make the joint meet or exceed the OCPD, so 32A is bound to be OK.
- Another way of looking at it, is to make sure the joint is not the weakest link. If you look at 2.5mm T&E CCC (such as Table 7.1(iii) in the OSG) then it is not more than 27A, so that would be another option.
- However, the real question is what is needed for RFC leg rating? As @Pretty Mouth has already listed it is explicit in regulation 433.1.204 but you could deduce that from looking at the acceptable methods for a 2.5mm RFC, which are (from OSG Table 7.1(i) on page 75) methods 100, 102, A & C, and of those the lowest rating is method 'A' at 20A.
