As per my understanding, the 'touching circuits" means the number of circuits that are installed on the same tray, except the circuit in discussion. I mean: if you have 3 different circuits on the same tray, each is touching with another 2.
For the circuit from the transformer to the main distribution board, I consider one circuit [with no neighbors], regardless the number of cables/phase is. Actually it is supposed I do not know until the calculation.
Still, I got two different results when I choose: "touching circuit" and "alone" for the example below, so, I think something is missing for me. Can yo see a little bit, please?