How much space between cables is enough?


I understand that proximity between power cables and interconnects or power cables and power cables is a problem, but is there a rule of thumb as to how much space is required to NOT be a problem. 1/2", 1", 6"? Also, are all cables the same? I would assume that the higher the current, the more isolation, but belief and reality are seldom the same.
128x128tony1954
"Honestly though, have a good time and just maintain logic, i.e., don't run the power cables close to and/or in parallel to any signal cables."

Parallel, or not, close to signal, or not, try not to run cables through the water tank.
Why would anyone buy junk and spend the rest of his life trying to make it better... Sows ear to Silk purse ? Can’t happen and all the B.S. dribble, drable look at me and my junk won’t make it happen. Spend what you want on new or vintage, research and see what the majority of people in the know enjoy....Be happy !

Cheers