Re: wire layout, cat5 and power lines
There is very little to worry about with residential wiring. The magnetic field around a wire is dependent on the direction of current flow. With residential wiring you have two wires, hot and neutral, running very close to each other with the current in one always running in the opposite direction of the other and the magnetic fields created pretty much cancel each other out. Noise spikes on the line can have some affect especially with single line or low voltage DC signals such as coax if the jacket is not grounded or speaker wire. Network cables are different, they are made up of twisted pairs that operate differentially. One wire has 5VDC on it and the other has 0 VDC, when a bit is sent the 5 VDC has to go to 0 and the 0 VDC line has to go to 5 VDC to be read as a bit. It is very difficult to induce a signal that will affect these twisted pairs. A few millimeters of separation is all that is required.
Generally speaking data and power cables are separated in different runs and boxes to prevent shorts between the two. 120 VAC on a network cable can cause a lot of damage.
Be sure you live your life, because you are a long time dead.-Scottish Proverb