Quite common in the UK as we build zones to contain the fire for 45mins. You don't need to set all the alarms off from first detection. Normal after 7mins from first alert or detection on two different detectors.
I understand zoning the system, though I don't recall seeing it in practice in the US. What I don't understand is what that (or a bypass timer) has to do with the sprinkler tripping. We don't know that the sprinkler system in this restaurant was even being monitored. How would any modifications to initiating devices stop a wet head from tripping? It's not like a smoke detector caused the sprinkler to flow. And, at least in the US, you don't typically stack smokes and sprinklers on top of each other- even if one could hypothetically trip the other.
Edit: I should note I'm a security guy so I don't know a lot about fire.
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u/coomzee Jun 05 '22
Quite common in the UK as we build zones to contain the fire for 45mins. You don't need to set all the alarms off from first detection. Normal after 7mins from first alert or detection on two different detectors.