Lightning protection zone (LPZ)

Illustrated explanation

Surge diversion and lightning protection boundaries

2Lightning protection zone (LPZ)
Surge diversion and lightning protection boundariesCallout 1: Surge protective device. Callout 2: Protection boundaries. A surge protective device provides a defined path or limitation for transient stress. Lightning protection zones describe coordinated electromagnetic conditions and boundary measures. Current term: Lightning protection zone (LPZ), callout 2. 1Protected circuitSurge protective device 2OuterInnerProtection boundaries
  1. Surge protective device (SPD)

    The device limits specified transient stress using its declared protection mode. Coordinate ratings and connections with the system.

  2. Lightning protection zone (LPZ)This term

    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.

ReferencesIEC 61643-01:2024 — Surge protective devices — General requirementsIEC 62305-4:2024 — Lightning protection of electrical and electronic systems