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
The EVAs are similar to AV Room Service's EVPs.http://avroomservice.com/evp-2/I know these work. Also recommended by Jim Smith (Get Better Sound).
The only way to take the floor completely out of the equation is to suspend from the ceiling.  The gauge of the monofilament should de commensurate with the weight of the cable.
What if the ceiling is also the first or second story floor?
What stops the vibrations being created by way of walking around or mechanical vibrations from translating itself down the fishing line thereby vibrating your cables?
Eye hooks --> rubber band --> monofilament --> cable.
Should have been more explicit.
Always run the positive wire on your speaker cables on the right side of you room, and the negative side on the left of the room.  Then, run the power cord from your front porch outlet, around your garage and coil it 7 times around your water heater tank.