6. Lightning Protection Zones (LPZ) · Page 2 of 6
Zone Boundaries & Barriers
Where SPDs must be installed at zone transitions.
Every cable crossing a boundary
Power, data, and antenna cables that cross into a cleaner zone need suitable SPDs or filters at that boundary. Protecting only power leaves a back-door path.
Equipotential bar at the boundary
SPDs should reference the bonding bar that defines the zone boundary—not a distant unrelated earth point.
Architectural coordination
Server rooms, control rooms, and MRF/COMMS rooms are natural LPZ 2 candidates when designed intentionally.