A lightning protection system’s only purpose is to ensure safety to a building and its occupants if lightning happens to hit them directly. And contrary to the myths, lightning protection systems:
Don’t attract lightning
Don’t and cannot dissipate or prevent lightning by ‘draining’ a storm of its charge
Do offer fire protection and structural damage protection by preventing a hot, explosive lightning passing through building materials.
Lightning protection systems (including placement of rods, cables, and groundings) are designed for individual structures. They should only be installed by qualified contractors.
Lightning protection systems don’t always prevent damage to electronics or computers. You should still unplug such devices during thunderstorms.
Franklin's Lightning Rod 