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