Leica SPIDER GR30 User Manual page 14

Lightning Protection
Zones
14
Damage caused by lightning or any other electrical discharge.
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Lightning Protection Zones (LPZ) can be divided into:
Zone
External
LPZ 0A, LPZ 0B
Internal
LPZ 1...n
At the boundary of each internal zone, the equipotential bonding must be car-
ried out for all metal components and utility lines entering the building or
structure. Equipotential bonding is done directly or with suitable SPDs.
Description
Zones which are at risk from direct lightning strikes,
from impulse currents up to the whole lightning cur-
rent and from the whole electromagnetic field of the
flash of lightning.
Zones where impulse currents are limited by splitting
the current and by Surge Protective Devices (SPDs)
at the zones boundaries. The electromagnetic field
of the lightning flash can be attenuated by spatial
shielding.
Safety Directions