Following the NFPA 13, which is the best way to find the most remote sprinkler head location in a grid system of a wet system? Where can I find information about test & drain valve location for grid systems?
Inspector's test valves can be installed anywhere in the sprinkler system after the waterflow indicator. Some contractors prefer to install them right after the waterflow (for easier testing) while others prefer the most remote location (for testing the most critical response).
Main drain test valves must installed according to NFPA 13 (2016) section 220.127.116.11.6. They are generally installed just after the system's control valve.
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