2.1.
This is, therefore, the method that
should used where the protect-
ive angle mesh method throw
up uncertainties. for
flat roofs)
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Chapter The external lightning protection system
. for air-termination rods)
• Mesh method (for simple planning tasks, e.g.α1
for h1
α2
for h2
h1
Building height air-termina-
tion rod
h2
air-termination rod height
α1+2
Protective angle
r Radius
m Mesh width
Designing lightning protection system using the protective angle, mesh and rolling sphere methods
The rolling sphere method the
only one the methods for plan-
ning air-termination systems that is
derived from the electrogeometric
lightning model and founded on
physical principles.1 Planning methods for air-termination systems
Following practical assessment the building, one
or combination the following planning methods is
selected:
• Rolling sphere method (particularly suitable for
complex systems)
• Protective angle method (for simple planning tasks,
e.g
