I think that you will find that it is an old carry over from the Insurance Service Offices (ISO) that acted as AHJ for most jurisdiction across the country until the early 1970's when the Government stopped them form doing this. They always required a 10% cushion on flow test. Most AHJs assumed that it was a NFPA requirement. The only thing that NFPA 13 requires is that consideration has to be allowed for seasonal fluctuations and other such interruptions of the water supply. This adjustment factor needs to be established and published by the AHJ. The above is my opinion: Phillip Brown
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