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Inner zones (protected against direct lightning LPZ 2...n Zone where the impulse currents are limited
strikes): by current distribution and isolating interfaces
LPZ 1 Zone where the impulse currents are limited by cur- and / or by additional SPDs at the zone bounda-
rent distribution and isolating interfaces and / or by ries. Additional spatial shielding may be used to
SPDs at the zone boundaries. Spatial shielding may further attenuate the lightning electromagnetic
attenuate the lightning electromagnetic field. field.

LPZ 0 A

LPZ 0 B

LPZ 0 B

LPZ 0 A

LPZ 0 B

LPZ 1
LPZ 0 B

LPZ 1
LPZ 1
MEB
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

Figure 7.1.2a Lightning protection zone concept according to IEC 62305-4 (EN 62305-4)

188 LIGHTNING PROTECTION GUIDE www.dehn-international.com