Although most of us work in buildings with lightning conductors,
these aren't designed to, and won't, stop transient overvoltages
from damaging electronic equipment. To prevent lightning damage
to electronic systems, this structural lightning protection
needs to be complemented with transient overvoltage protection.
Interestingly, if we use the lightning risk assessments in BS
6651, the risk of transient overvoltage damage to electronic
systems inside a building is greater than the risk of damage
to the building itself.
Therefore, if like most people, you work in a building where
structural lightning protection has already been thought necessary,
then there is a ready made argument for transient overvoltage
protection.
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