Illustrated explanation
1Surge protective device (SPD)Surge diversion and lightning protection boundaries
- Surge protective device (SPD)This term
The device limits specified transient stress using its declared protection mode. Coordinate ratings and connections with the system.
- Lightning protection zone (LPZ)
Boundaries separate defined lightning electromagnetic conditions. Bonding, screening and surge protection are coordinated at the relevant interfaces.
A surge protective device provides a defined path or limitation for transient stress. Lightning protection zones describe coordinated electromagnetic conditions and boundary measures.
Conceptual system relationships, not a lightning-protection design. Device coordination, bonding, routing and declared surge duty need project-specific engineering.