It is not probable to provide 100% protection to a structure against damages
from direct lightning strike. With ever increasing use of electrical components,
more sophisticated equipments and ever taller buildings, the need of lightning
protection has become greater.
However, in many situations the need for lightning protection is critical due to
the severe consequences that could result from an unprotected lightning strike.
Hence, it has always been recommended to do a lightning risk assessment before
the design and installation of a Lightning Protection System.
As reported from our code of practice, Singapore has one of the highest lightning
rates in the world. During the period of 1982 to 2008, the monthly distribution
of mean thunder days shows the peaks in April/May and October/November
with at least 18 thunder days each. Lightning Ground Flash Density (GFD) of
Singapore varies from 5 to 36 flashes per sq km with an average of 16.0.
Each year, thousands of homes and other properties are damaged or destroyed
by lightning. Even though protection from lightning damages have been greatly
stressed and enforced there are still reported cases of damages caused by
lightning in many parts of the world.