In a fully sprinklered building, is it the intent of the code not to have to sprinkler a pump room housing an electrical driven fire pump when the total encloser is 2hour rated?
NFPA - 20 - 2019 (184.108.40.206) & (220.127.116.11) says about having the sprinkler in fire pump room if the pump room / building is having an electric driver and a diesel engine. The same shall be as per ordinary / extra hazard group occupancy and sprinkler shall be installed in accordance with NFPA - 13.
Protection is required for fire pump(s) from all other areas of the building by 2-hour fire-rated construction. If the pump room and adjacent areas are protected with an automatic sprinkler system, the separation recommendation can be reduced to 1-hour fire-rated construction.
Locate the fire pumps on the first floor or a basement level of the building so direct access to the pump from the street level is possible. Consider flood exposure to the pump when it is located in a below grade level.
As per FM (Factory Mutual), automatic sprinkler shall be installed in fire pump room, where engine driven pump and electrical driven pump are available, along with 1 hour or 2 hour fire separation of fire pump room.
In contrast; you could discuss with local AHJ for sprinkler installation in fire pump room to have a way forward.
Hope this helps.
In my experience, pump rooms always have sprinklers in sprinkler protected buildings and I've never seen anything in fire protection literature to justify their omission. NFPA 13 says you can omit sprinklers from electrical plant rooms (with dry electrical equipment) if the walls are 2 hour fire rated, but I've never encountered anyone applying that rule to pump rooms as they don't seem to count as dry electrical equipment.
If you use UL listed controllers, they are well protected from water splash so should keep running in the event of a fire.
In a fully sprinkler building, it is mandatory to protect the fire pump room with sprinklers. Code does not say like that which we can omit the sprinklers with 2-hr fire rated construction.
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