It's perfectly safe to run Cat5 parallel to power lines (or any other EMI source). The twisting of the wire pairs cancels out almost all interference.

A tutorial on how to use RJ-45 UTP cabling for video transmission and camera control as you migrate toward IP-based wiring An illustration shows a suggested format for connecting analog video ...

Belden 1872A MediaTwist Cat 6 cable. Last month, we covered unshielded twisted pairs (UTP) to carry audio. The highest-quality UTP is computer cable, premise/data cable. It's called Cat 5, Cat 5e or ...

Robert Metcalfe, David Boggs, and their associates really started something back in 1973 when they invented Ethernet. It started out as just one of many contenders for LAN supremacy and essentially ...

Coaxial cable: Coax is good for short wire runs in low-noise environments. Its thick copper construction yields low signal losses. As an unbalanced transmission-line, its interference immunity is poor ...