Where should line bonding at a building entry be placed?

• A. Close as practical to building entry, using EGB or grounding electrode system.
• B. At the far end of the property away from the building.
• C. On the tower base only.
• D. In a distant manhole.

Answer: (A)

The essential idea is to provide a direct, low-impedance bonding path from the incoming line into the building’s grounding system at the point where the line enters. Placing the bond as close as practical to the building entry ensures a single, strong reference to earth for all equipment connected at that entry, which helps equalize potential and provide a clear path for fault currents and surges.

Connecting to the building’s grounding electrode system or to the equipment grounding bar creates a robust, code-aligned bond that minimizes impedance and reduces the chance of dangerous voltage differences appearing on enclosures or conduits. This setup improves protection against lightning and transient events and helps keep all parts of the installation at the same potential.

If bonding were placed far from the building, at the far end of the property, at the tower base, or in a distant manhole, the path to earth would be longer and potentially less effective. That increases impedance, leaves room for voltage differences between equipment, and weakens surge protection.