Leica GM30 User Manual page 12

Lightning
Protection Zones
GR30/GM30/GR50, Safety Directions
Lightning Protection Zones (LPZ) can be divided into:
Zone Description
External Zones which are at risk from direct lightning strikes, from impulse
currents up to the whole lightning current and from the whole elec-
LPZ 0A, LPZ 0B
tromagnetic field of the flash of lightning.
Internal Zones where impulse currents are limited by splitting the current
and by Surge Protective Devices (SPDs) at the zones boundaries.
LPZ 1...n
The electromagnetic field of the lightning flash can be attenuated
by spatial shielding.
At the boundary of each internal zone, the equipotential bonding must be carried out
for all metal components and utility lines entering the building or structure. Equipo-
tential bonding is done directly or with suitable SPDs.
Lightning protection zones concept according to IEC 62305-4 (EN 62305-4)
a
b
d
q
p
c
l
g
m
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a) Lightning electromagnetic pulse (LEMP)
b) Lightning protection zone 0A (LPZ 0A)
c) Lightning protection zone 0B (LPZ 0B)
d) Lightning protection zone 1 (LPZ 1)
e) Lightning protection zone 2 (LPZ 2)
f) Lightning protection zone 3 (LPZ 3)
g) Switching electromagnetic pulse (SEMP)
h) Lightning equipotential bonding
Lightning current arrester (SPD Type 1)
i) Local equipotential bonding
Surge arrester (SPD Type 2, SPD Type 3)
j) Lightning equipotential bonding
Lightning current arrester
k) Local equipotential bonding
Surge arrester
l) Low voltage power supply system
m) IT system
n) Steel reinforcement
o) Foundation earth electrode
p) Ventilation
q) Spatial shield
r) Terminal device
s) Air-termination system
t) Down conductor system
s
c
a
a
c
f
r
e
d
n
j
h i k
b
t
o
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