What are the NESC requirements for communication cables located on the same supporting structure (e.g. pole) as a traffic signal?

Clearances from communication lines and equipment to traffic signal brackets and span wires are located in NESC Rule 238C. If the traffic signal is above the communication cables, 40” is required for non-grounded brackets and span wires and 4” is required for grounded traffic signal brackets and span wires. If the traffic signal is below the communications, 4″ is required and the bracket or span wire must be grounded.

Clearances to traffic signal drip loops and cables are in Rule 238D. A minimum of 12″ is required between the traffic signal drip loop and the highest communications cable or equipment. An exception allows 3” if the drip loop is covered with suitable nonmetallic protection.