> I want to run Cat5 for Ethernet near and parallel to power cable. The
> power cable is 277V 20A 60Hz for fluorescent lighting with "clean"
> electronic ballasts. The power cable is inside 1" metal conduit. I
> do not plan the put the Cat5 in conduit.
> 1) Will 100Mb Ethernet be impared by induced interference from the
> power cable?
> 2) What about interference to gigabit Ethernet?
> 3) Is it important to tie down the Cat5 to make sure it does not touch
> the conduit carrying power?
UTP ethernet is fairly insensitive to such signals. The ability to keep a
100MHz signal inside a twisted pair also keeps other differential mode
signals out. Transformer coupling keeps common mode signals from bothering
the signal. Gigabit may be a little more sensitive, but you shouldn't
Metal conduit is very good at keeping signals apart. Definitely don't run
cat5 inside the same conduit. Though I would be surprised if it caused
problems, it is definitely against the electrical code in the US, and
probably other places.
There was a discussion once about putting a common mode 120V AC signal on a
UTP cable and testing its ability to run ethernet. I never tried it,
though. The transformers are supposed to be good to 500V or 1000V, so it
would probably work.
If you run an a factory full of arc welders (it was asked here before) you
might worry about this, otherwise you most likely don't need to. I believe
tying to metal conduit is fine, unless that is against the electrical codes.
I know they make raceway divided into two paritions, one for AC power
wiring, the other for network wiring.