What considerations should be given to addressing interference from power networks?
The first is in understanding the dielectric strength of the insulation of both the power cable and the data cable, For example Excel 190-996 F/FTP cable has a dielectric strength of 1Kv for 2sec (this information can be found on the products data spec sheets). Considering the power frequency is generally 50Hz this is enough to protect the data transmission.
Power segregation is another consideration if the installation of the cable is to be Standards compliant (both BS 6701 and 7671) then the correct separation or screen must be applied. Screening of the data cable simply isn't enough.
Correct PE & FE earthing and bonding of both the power cable/s and data cable/s is crucial to ensure any transient voltage or EMI are grounded as efficiently as possible. Equipotential bonding is also advisable to reduce the risk of conductive elements of the installation such as containment and the cables within it becoming energised.
A power network cable should not create interference if earth and bonded correctly