The NFPA 13 ROP and ROC both have items that should help clear up the issue.
IF the proposals are accepted as written, any sprinkler protecting a
dwelling unit (residential or QR) fed from a dry system will have to deliver
water within 15 sec.  (Reference section 7.2.3 and subsections)

Ed Kramer
Littleton, CO

> Art,
> 
> Where does the 15 seconds come from? I can't find anything in 13. Is
> it 101? is it a local requirement?
> 

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