LPZ 1
No direct flash,
partial lightning or
induced current,
damped.
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. The concept expanded
upon IEC/BS 62305-3 and IEC/BS 62305-4.
LPZ 0
Direct flash, full
lightning current, full
magnetic field.
Air termination
network.
LPZ 2
No direct flash,
induced currents,
further damped
magnetic field.
Earth termination network.
Rolling sphere
radius.
—
02 The LPZ concept
In general the higher the number the zone
(LPZ LPZ etc) the lower the electromagnetic
effects expected.
SPD 0/1
Equipotential
bonding by
means SPD. 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).
SPD 0/1
Down conductor network.
Figure highlights the LPZ concept applied the
structure and SPM.
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 2/3
(for power and data lines).
LPZ 3
SPD 1/2
—
02
107
TECHNIC REFERENCE IEC/BS 62305 LIGHTNING PROTECTION ZONES (LPZ)
.—
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.
SPM were previously referred LEMP
Protection Measures System (LPMS) IEC/BS EN
62305:2006.
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
