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
I coil mine around the water heater much differently.  I go from top to bottom, and it must be a minimum of three wraps.  Phenomenal difference!  Enlightening to the Nth degree.  

Though I am kidding, of course, somebody might actually try this.  Oh, what have I done?

 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.  By all means, enjoy the music.  
Something called tuberollin writes:
@millercarbon from tuberculin
You are a troll.

Wait a minute. Audiogon spell check turns tuberculin into tuberculin and you blame me?!?!?!
I typed your name by the way. Spell check turned tuberculin into tuberculin. See? Did it again! How is that my fault? And don’t call me troll. That is insulting. I am the troll master.