Page 228 - IPD Product Catalog V17

Lightning & Surge Protection

SPD Location

AS 1768 requires the installation of primary SPDs at the boundaries of Lightning Protection Zones LPZ0 and LPZ1. Lightning Protection Zones
are defined in a structure as follows:

Zone where the threat is due to the direct lightning flash and the full lightning
LPZ0 A electromagnetic field. Without SPDs, the internal systems may be subjected to full
Outer Zones
lightning surge current.

LPZ0 Zone protected against direct lightning flashes but where the threat is the full lightning
electromagnetic field. Without SPDs, equipment beyond this boundary may be subjected
B
to partial lightning surge currents.

Zone where the surge current is limited by current sharing and isolating
LPZ1 interfaces and/or by SPDs at the boundary. Spatial shielding may attenuate the lightning
electromagnetic field.
Inner Zones

LPZ2 Zone where the surge current may be further limited by current sharing and isolating
interfaces and/or by additional SPDs at the boundary. Additional spatial shielding may be
used to further attenuate the lightning electromagnetic field.

LPZ0 A

LPZ0 B

LPZ2

LPZ2 LPZ1

LPZ0 B

LPZ3

LPZ2
LPZ1

LPZ1

MEB LPZ2
HES
Lightning equipotential bonding Lightning protection zone Equipotential bonding
Lightning current arrester (type 1) MEB Main earthing busbar Air-termination system
Local equipotential bonding Low-voltage supply system Metal supply line
Surge arrester (type 2/3) Information technology system Shielding

The zone boundaries are not necessarily physical boundaries but are theoretical boundaries where the structure is divided into lightning protection
zones based upon the risk level posed by surges resulting from the lightning electromagnetic pulse.

228 1300 556 601 | ipd.com.au | V17-R05