I am inserting an extension into a ring, but am not clear as to how the rating tables apply - see
Method C specifies which does not mention timber.
Whilst method B does not specify the wall material at all.
Please can someone kindly clarify?
As it is a ring I need to select a method which permits 20A minimum & would not be happy if a larger cable dia is needed.
I have always considered timber to be quite a good thermal insulator, but it has never been clear to me exactly how it is regarded by the iee regs - can anyone explain please?
TIA