G'day Trumpy. If you email or phone General Cables or Olex in Ch Ch they can punch your details in to their software and give you the specs for their cables. This is much easier than trying to figure out parallels for yourself, and cheaper than buying the software. It seems to me that a circuit can be uprated 65% to 75% when using the same conductors in parallel with the right grouping factor.
You're right though it's hard to find details of parallel cable calculations in NZ.
