What year(edition) of NFPA 72 did it require that strobes be synchronized?
Many moons ago
Maybe the 99 edition???
"""Although one solution involves synchronized (simultaneous flashing) strobes, other options have been outlined by NFPA and the proposed ADAAG. The NFPA makes it clear in Chapter 6, Section 6-188.8.131.52 that synchronization is only one of several installation configurations that the systems designer can use to minimize multiple strobes flashing in an individual’s field of view. These four options are outlined on page 8. Also, in 1996 the NFPA changed its maximum acceptable strobe flash rate"""
OHHH I am not an engineer, so you can discount my reply if you want, and I cannot do math.
Ok maybe missed it by three years:::
"""Americans with Disabilities Act
In the 1996 edition of NFPA 72, a new fire alarm code was added concerning strobe synchronization to comply with ADA (Americans with Disabilities Act)."""""""""
I attached the article, in the next reply, it came from, just takes awhile for the site to release it.
The fire alarm strobe synchronization has been a requirement since the mid 80's for schools and hospitals. The code was introduced in compliance with Americans with Disabilities Act. The reason behind this national code requirement is to help prevent what is called photosensitive epilepsy.
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