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Audible and visible alarms shall be installed both inside and outside the protected area to signal the activation of an automatic detection device and the operation of the fire extinguishing system. Such signals shall continue until the atmosphere has been returned to normal. Activation of a single automatic detection device shall sound a local alarm and transmit an alarm to an approved central station. Unless the alarm is cancelled by an abort system as set forth in FC904.3.7.2.3, activation of a second automatic detection device shall, within 30 seconds, initiate the discharge of clean agent. Power supply to the alarm system shall be in accordance with the Electrical Code, the construction codes, including the Building Code, and NFPA 2001, as modified by FC Appendix B.

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G.2.4.6 High Pressure Natural Gas Installations, Shutoff Valves Closure
The gas detection system alarm activation shall trigger emergency gas shutoff valves serving the affected area to close and stop the gas flow ...
G.2.4.6 High Pressure Natural Gas Installations, Shutoff Valves Closure
The gas detection system alarm activation shall trigger emergency gas shutoff valves serving the affected area to close and stop the gas flow ...