Quote:
Originally Posted by virometal 
Heh I'll offer that if you're truly worried about the direction of your signal and power cables, well you're in deep my friend.  There's nothing wrong with it, just know it.
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Actually, if you run unshielded, single-ended signal cables tightly in parallel with power, you can pick up a 60hz hum. Or 50hz in europe.
Differential or "balanced" signals have high common-mode rejection and would be almost completely immune.
In general, signal wires and mains AC power should cross at 90 degree angles.
Goes double for in-ceiling wiring and fluorescent lighting, btw.