Figure highlights the LPZ concept applied the
structure and SPM.
LPZ 1
No direct flash,
partial lightning or
induced current,
damped.
SPD 0/1
Equipotential
bonding by
means SPD.
Air termination
network.—
Technical reference
IEC/BS 62305-1 Lightning protection zones (LPZ)
Lightning protection zones (LPZ)
The concept the Lightning Protection Zone
(LPZ) was introduced within IEC/BS 62305
particularly assist determining the
protection measures required establish
protection measures counter Lightning
Electromagnetic Impulse (LEMP) within
a structure. The concept expanded
upon IEC/BS 62305-3 and IEC/BS 62305-4.
—
02 The LPZ concept
In general the higher the number the zone
(LPZ LPZ etc) the lower the electromagnetic
effects expected.
LPZ 0
Direct flash, full
lightning current, full
magnetic field.
SPD 2/3
(for power and data lines).
SPM were previously referred LEMP
Protection Measures System (LPMS) IEC/BS EN
62305:2006. Typically, any sensitive
electronic equipment should located higher
numbered LPZs and protected against LEMP
by relevant Surge Protection Measures (SPM as
defined IEC/BS 62305).
The general principle that the equipment
requiring protection should located an
LPZ whose electromagnetic characteristics are
compatible with the equipment stress withstand
or immunity capability.
LPZ 3
SPD 1/2
—
02
107
TECHNIC REFERENCE IEC/BS 62305 LIGHTNING PROTECTION ZONES (LPZ)
.
The concept caters for external zones, with risk of
direct lightning strike, partial lightning current
occurring (LPZ and levels protection within
internal zones (LPZ LPZ 2).
SPD 0/1
Down conductor network.
Selection the most suitable SPM made using
the risk assessment accordance with
IEC/BS 62305-2.
LPZ 0
No direct flash, partial
lightning induced current,
full magnetic field.
LPZ 2
No direct flash,
induced currents,
further damped
magnetic field.
Earth termination network.
Rolling sphere
radius
