Page 10 - Surge-Protection-E_0.pdf

Planned Safety

LPZ 0 B LPZ 0 B
LPZ 2 LPZ 2

LPZ 2 LPZ 2 Lightning equipotential bonding
Lightning current arrester /
Combined arrester
LPZ 3 Local equipotential bonding
Surge arrester
Lightning protection zone
LPZ 2 LPZ 2
MEB Main earthing busbar
LPZ 1 LPZ 1 Low-voltage supply system

MEB LPZ 2 MEB LPZ 2 Information technology system
Equipotential bonding

Air-termination system
Metal supply line
Shielding

Figure 5.3: Transition from LPZ 1 to LPZ 2 Figure 5.4: Transition from LPZ 2 to LPZ 3

IEC 62305-4:2010
Outer zones: Inner zones (protected against direct lightning flashes):
LPZ 0 Zone where the threat is due to the unattenuated lightning electro- LPZ 1 Zone where the surge current is limited by current sharing and
magnetic field and where the internal systems may be subjected to isolating interfaces and/or by SPDs at the boundary. Spatial
full or partial lightning surge current. shielding may attenuate the lightning electromagnetic field.
LPZ 0 is subdivided into: LPZ 2 ... n Zone where the surge current may be further limited by current
LPZ 0A Zone where the threat is due to the direct lightning flash and the sharing and isolating interfaces and/or by additional SPDs at
full lightning electromagnetic field. The internal systems may be the boundary. Additional spatial shielding may be used to
sub jected to full lightning surge current. further attenuate the lightning electromagnetic field.
LPZ 0B Zone protected against direct lightning flashes but where the threat
is the full lightning electromagnetic field. The internal systems may
be subjected to partial lightning surge currents.
Table 1: Definition of lightning protection zones.

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