NV Fire Protection Practice Questions - Nevada C-41 Fire Protection Contractor Examination Exam

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In NFPA 13 (2007), which system keeps water out of the branch piping until a detection system operates, then fills the piping and discharges only from sprinklers that have opened?

A wet-pipe system A deluge system with open nozzles A single-interlock preaction system A pipe-schedule standpipe

Correct Answer:

A single-interlock preaction system

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