What is the required duration for a Secondary Water Supply within Seismic Zone?
IBC Section 403.3.3:
"The secondary water supply shall have a duration of not less than 30 minutes as determined by the occupancy hazard classification in accordance with NFPA 13."
Does this mean minimum 30 minutes, with the gpm/demand determined by NFPA 13?
Or the minimum duration is also determined by NFPA 13, such that the secondary water supply could require an even longer duration, like 60 minutes?
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