melted metal (Source S1).
LPL III IV
Maximum current (kA) 200 150 100 100
Minimum current (kA) 16
—
Table Lightning current for each LPL based 10/350 μs
waveform
S1
Flash the
structure
LEMP
Immediate mechanical
damage (Source S1)
Injury people by
electric shock
resulting from
resistive and
inductive coupling
(Source S1).e. Each level has fixed
set maximum and minimum lightning current
parameters.
Fire and/or explosion triggered sparks due overvoltages and lightning currents
transmitted through the connected service (Source S3).
Fire and/or explosion triggered sparks caused overvoltages resulting from resistive
and inductive coupling and passage part the lightning current (Source S1).
LEMP
Lightning
current
Induced
overvoltage
Induced
overvoltage
LEMP
LEMP
S2 Flash
near the
structure
S4 Flash near
a line connected
to the structure
The minimum values lightning current have
been used derive the rolling sphere radius
for each level.
S3
Flash line
connected the
structure
Fire and/or explosion due the hot lightning arc itself, due the resultant ohmic
heating conductors, due arc erosion, i.
Failure malfunction internal
systems due overvoltages
induced connected lines
and transmitted the structure
(Source S4) LEMP
(Source S2).
The maximum values have been used the
design products such lightning protection
components and Surge Protective Devices (SPDs). These parameters are shown Table 2.
Injury people due touch
voltages inside the structure
caused lightning currents
transmitted through the
connected service (Source S3).
—
01 The types damage
and loss resulting from
a lightning strike on
or near structure
—
01
106 FURSE® EARTHING LIGHTNING PROTECTION
QUALIT SOLUTIONS FOR SAFEGUARDING PEOPLE, STRUCTURES AND SERVICES
.—
Technical reference
IEC/BS 62305-1 Lightning protection levels (LPL)
Lightning Protection Levels (LPL)
Four protection levels have been determined
based parameters obtained from previously
published technical papers
