NFPA 72, 2016 Edition uses the phrase "2-hour fire-rated construction" in a few places; what does this refer to?
It's confusing to me since a variety of elements within the building could be 2-hour rated. For example, NFPA 72-2016 Section 188.8.131.52 states:
"Two-way in-building wired emergency communication systems shall have a pathway survivability of Level 2 or Level 3. Exception: Level 1 shall be permitted where the building is less than 2-hour fire-rated construction."
Buildings are not designated with a fire-rating, elements are. How do you interpret this?
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