Protective equipotential bonding is through connecting extraneous conductive parts in a building to the main earthing terminal of the installation by protective bonding conductors. Where such conductive parts originate outside the building, they shall be bonded near their entry point within the building.

To safeguard metallic structures with current-carrying capabilities from lightning strikes or fault currents, a low-impedance path to the grounding system is crucial for swift fault current dissipation.

Structural Earthing achieves this by utilizing a building’s inherent metal components (like reinforcements in ceilings, walls, and facades) to form a large Faraday cage. This cage disperses lightning or fault currents through multiple paths, minimizing voltage drops and ensuring structure and occupant safety.