OP
xraytek
I think the overload issue will be on the ring, if the additional radial is not at the midpoint.not sure you all understood me.there are no overload problems because 4mm rated at 36amps.also the cable is stranded so no sparks would mistake it for 2.5..where are the technical problems with this?.
If the radial is close to the CU then a large percentage of that current will take the short route and overload that part of the ring.