We would run a 4.0mm radial off a ring, which explains the 32A, however new radials from the board would be on a 20A, rare to run though due to the cost. Appeared that 6.0mm was cheaper than 4.0mm..
A 2.5mm radial is not expensive?? Or do you mean a 4mm? As has been said, no need to run a 20a radial in 4mm, and I'd like to know where you can get 6mm cheaper than 4mm!!