The short answer is NO, do NOT bond the CCTV pole's ground array to the controller cabinet's ground array. In this specific configuration, bonding them together is likely to increase the risk of damage from lightning surges.Here's a breakdown of the reasoning, drawing upon relevant electrical and lightning protection standards: Lightning Protection Philosophy (Avoid Ground Loops)

Lightning protection systems are designed to channel lightning energy safely to ground. Creating a direct bond between two separate grounding systems 200 feet apart introduces a significant opportunity for ground loops and potential differences during a lightning event. This potential difference can drive destructive currents through the Cat6 cable and connected equipment, even if the cable has surge protection.

Potential Difference Problem

During a lightning strike, the ground potential near the CCTV pole will rise dramatically. If that ground potential is tied directly to the controller cabinet, that high potential will be conducted directly into the cabinet through the bond wire. This would exceed the surge protection capabilities.

IEEE/ANSI C62.41 and C62.45 (Surge Protection)

These standards address surge protection for low-voltage AC power circuits and data lines. They emphasize the importance of bonding surge protection devices (SPDs) to a common ground within the equipment (controller cabinet). Bonding two separate grounding systems over a long distance is counterproductive and violates this principle.

NEC (National Electrical Code)

The NEC provides general guidance on grounding and bonding but isn't specifically tailored to lightning protection. While it requires grounding for safety, it doesn't mandate bonding separate grounding systems like this in the context of a lightning protection system.

POE and Isolation

POE (Power over Ethernet) injects power into the Cat6 cable. A voltage difference between the two ground systems could damage the POE circuitry and related equipment. Isolation is preferred for protecting sensitive electronic equipment.

Best Practices



Isolate the Ground Systems

Keep the CCTV pole's ground array separate from the controller cabinet's ground array.

Utilize Surge Protection

Implement robust surge protection on both ends of the Cat6 cable – at the CCTV pole and within the controller cabinet. Ensure the SPDs are properly rated for the expected surge levels and are connected to the respective local grounds. Shielded CAT6 cable should be used and the shield properly bonded to ground at both ends.

Fiber Optic Alternative (If Possible)

If possible, consider replacing the Cat6 cable with fiber optic cable. Fiber optic is non-conductive and completely isolates the two locations, eliminating the ground loop problem.

Exceptions

There might be exceptional circumstances where bonding could be considered, but these are rare and would require a detailed engineering analysis, typically involving a lightning protection specialist. These exceptions would typically involve a meshed grounding system where bonding is designed to equalize potentials across a widespread area.

Recommendations


Consult with a Lightning Protection Specialist

Engage a qualified lightning protection engineer to review the entire installation. They can perform a risk assessment and recommend the most appropriate protection strategy for your specific situation.2.

Verify SPD Ratings

Ensure the surge protection devices (SPDs) used on the Cat6 cable and within the controller cabinet are properly rated for the expected surge levels in your area.3.

Review Grounding Practices: Confirm that the grounding within the controller cabinet follows best practices and adheres to relevant standards (NEC, IEEE, etc.).In summary, isolating the CCTV pole's ground array from the controller cabinet's ground array and relying on surge protection on the Cat6 cable is the recommended approach for this specific scenario. Avoid the temptation to bond them together, as it is likely to create more problems than it solves.Disclaimer: This information is for guidance only and should not be considered a substitute for professional engineering advice. Always consult with qualified professionals for your specific project requirements. Flag for review