Brochure/Catalogue

LPL Lightning protection level
LPL I = 200 kA LPL II = 150 kA LPL III = 100 kA
Maximum lightning current that can enter as a direct strike in the external
lightning protection. Various applications and buildings are categorised according
to these lightning protection levels.
10/350 µs: test current for lightning arrester (Type I products), for simulating or
reproducing a lightning bolt.
8/20 µs: test current for lightning arrester (Type II products), for simulating or
reproducing a surge voltage.
LPS Lightning protection system – a complete system that is used to reduce the
physical damage to a building or facility that could be caused by direct lightning
strikes.
LPZ Lightning protection zone = lightning protection zone The lightning protection
zones are divided into: external lightning protection LPZ 0 / 0A / 0B and internal
lightning protection LPZ 1, 2, 3.
Max. continuous voltage U
c
The highest RMS value of the AC voltage or the highest value of the DC voltage
that is allowed continually on the protective path of the surge protection device.
Continual voltage = rated voltage.
Maximum discharge surge current
I
max
Peak value of the current 8/20 µs during duty test for Type II (type 40 kA).
Measured limiting voltage Max. voltage level while loading with pulses of a specic form and amplitude
during the test.
Mode 1 State where the voltage-limiting part of the SPD was disconnected. The voltage-
limiting function is no longer available, but the cable is still functional.
Mode 2 State where the voltage-limiting part of the SPD was short-circuited due to a
very low impedance within the SPD. The line is inoperable, but the measuring
equipment is still protected by means of a short-circuit.
MOV See varistor.
Nominal discharge surge current At peak value of the surge current 8/20 µs, during test for Type II (type 20 kA)
PAS main earth rail Metal rail which is connected with the foundation, and which can be used to
connect metal installations, external conductive parts, power supply cables,
telecommunications cables, water pipes and gas pipes to the LPS.
PE Protective system and earth system to which energy is discharged.
Protection level, U
p
Species the residual voltage that can still be measured at the terminals during a
surge voltage pulse (preferred value is greater than the largest measured limiting
voltage). Important parameter that characterises the performance of the SPD.
Protective path Component circuity in a SPD: conductor to conductor, conductor to earth,
conductor to neutral, neutral to earth are designated as protective paths.
Pulse current 10/350 µs Pulse voltage with a front time of 10 µs and a half-value time of 350 µs.
Pulse current 8/20 µs Pulse voltage with a front time of 8 µs and a half-value time of 20 µs.
Pulse voltage 1.2/50 µs Pulse voltage with a front time of 1.2 µs and a half-value time of 50 µs .
Radiation coupling Electromagnetic eld coupled to one or more conductive loops.
Rated voltage UC The maximum RMS value of the AC voltage which may continuously be applied
to an arrester.
Glossary
W
The basics of lightning and surge protection
W.40 2028840000