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Question: as mentionned in the upper link : "A bypass may be installed around the check valve installed in the piping between the system and Fire Department Connection (FDC). The bypass would include a supervised valve in the normally closed position. During testing the contractor would flow...

Article 11.1.2 (1) (NFPA-13, ed.2007) can be read as : “ Where areas are not physically separated by a barrier or partition capable of delaying heat from a fire in one area from fusing sprinklers in the adjacent area, the required sprinkler protection for the more demanding design basis shall...