In what configuration should communications wires and cables be kept below?

Wires and cables for communication systems should be installed below electric light or power conductors to minimize the risk of interference and potential hazards. Power conductors can generate electromagnetic fields and other electrical disturbances that can adversely affect the performance of low voltage communication lines such as data, telephone, and video systems.

When communication cables are placed below power lines, it helps ensure that any electromagnetic interference is mitigated, leading to reduced noise and better signal integrity. Furthermore, positioning communication wires below power conductors can also contribute to safety, as it reduces the risk of accidental damage during maintenance or installation activities.

While other configurations, such as running communication wires with television systems, control systems, or fiber optic cables, could be permissible under certain conditions, they do not offer the same level of advantage in terms of interference and safety as maintaining the lower position for communication wires relative to power conductors. Therefore, the best practice is to keep communications wires and cables below electric light or power conductors.