Hopkinton Town Library
Lightning Protection
September 13, 2018
Following the fire at the Hopkinton Town Library, there
have been questions about lightning protection on the Library. We can assure
you that the Library, like all town buildings, meets all required building
codes. There is no current New Hampshire code requirement for lightning
protection, nor did one exist in 1997 when the Hopkinton Town Library was
built. Lightning protection is also not part of the National Electric Code
(NEC) in New Hampshire.
We have been discussing the pros and cons of lightning
protection with our contractors and insurance company. We have learned that a
single weathervane, if grounded, could likely have caused damage beyond what
was experienced, as the wire would have been significantly overloaded by the
strike. A more complex lightning protection system, consisting of a series of
heavy gauge wires connecting multiple lightning rods to multiple grounding
rods, does exist, but such systems are used primarily for power plants, towers,
spires, smoke stacks, and aviation related structures. According to our
insurance adjuster, even such a robust lightning protection system would be no
guarantee against damage from a lightning strike.
As we plan for the reconstruction of the new library
space, we will be paying close attention to safety and energy conservation
measures. We welcome comments and questions.
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