Routing PT secondary wires...

PT are high voltage, so we have electric fields. Putting the wire in a corner of the chassis, causes the field lines to be drawn towards the chassis. But if you have to have much longer wires, this advantage will become smaller. Every advantage has a disadvantage.

Also keep 'm away from sensitive circuitry. Distance helps.

In the few amps I've build I've put them in the corner opposite to the sensitive circuitry. Works fine.

 

In this case I would choose option two. Way shorter wires. Option 1 is also not tucked in the chassis corners. Both are far away from the sensitive input.

Note that rotating the PT 90 degrees in option 1 would have made the short route more obvious. Having said that I have chosen a 220V led iso a 6V lamp to keep the large current heater wires short, which would have required the PT to be rotated 90 degrees in the other direction.

So it is all related and good is quite often good enough. I'm still learning that though