Rooftop tower bonding to the Main Roof Perimeter Lighting Protection Ring requires at least two opposing conductors.

• A. True
• B. False
• C. Not specified
• D. Not required

Answer: (A)

The key idea is to ensure equipotential bonding between the rooftop tower and the Main Roof Perimeter Lighting Protection Ring. When lightning or a surge occurs, currents want a low-impedance path to ground. Using at least two bonding conductors placed on opposite sides of the ring creates a complete bonding loop around the perimeter, tying the tower to the ring at two points. This makes the entire ring and the attached structures essentially at the same electrical potential, reducing dangerous voltage differences across the roof and improving survivability of the installation.

Having two opposing bonds also adds redundancy. If one bond path is compromised, the other still maintains a low-impedance connection, which helps keep the potentials more uniform and protects equipment and personnel. In contrast, bonding with a single conductor could leave portions of the ring at different potentials and provide a weaker path for surge currents.

So, the requirement is to use two opposing bonding conductors to ensure a robust, continuous, and redundant connection between the rooftop tower and the perimeter lighting protection ring.