Does NFPA 96 require fuel and power shut off circuits to be "fail safe"? That is, the function is performed when a connection is lost.
It appears you are talking about electrical gas valves. The valve is held open by an energized solenoid. Upon the suppression system activation, the switch contacts in the regulated release assembly open causing the valve to close by de-energizing the circuit to the gas a valve. If the connection between the release assembly and the solenoid is interrupted, for any reason the valve will close.
Maybe there is not a concise understanding or meaning of fail-safe. In my opinion, fail-safety is ensured by the fact that the fuel shut-off valve must be armed manually in order to work and allow the passage of the fuel/electric power to the fire-extinguishment protected cooking appliances.
In the spirit of Subsection 10.4.4 of the 2017 NFPA 96:
"Shutoff devices shall require manual reset."
Once the fuel/electric power shut-off has been tripped, rearming can only take place when the system has returned to normal working parameters.
My inspection experience it was common to see the electric gas valve was wrongly specified and installed with no manual reset.
These actuation devices are included under UL 300, and Certified products can be found in UL category GBNZ.
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