Questions · Fire detection
What goes into a data centre or an electrical room?
In a data centre point detection arrives late for a physical reason: the air in the room is changed many times an hour and dilutes the smoke before it rises to the ceiling. What is used is aspirating detection, with sampling in the room, in the air return of the cooling units and, where it is needed, inside the cabinets themselves. And there are two more volumes that almost never get counted: under the raised floor and above the suspended ceiling, which is where the cabling runs.
The same, with less air, in electrical rooms and substations: the fire starts in a panel or in a cable tray and what matters is finding out while it is still a piece of plastic heating up. Aspirating detection or reinforced point detection above, and heat-sensitive cable over the trays when the run is long. In these rooms the interlock weighs as much as the detector: what gets cut, in what order and what never gets cut.
When there is gas suppression, which is the usual thing in a data centre, the boundary appears again. The detection, the double coincidence before firing, the timer, the do-not-enter alert, the release and abort call points and the interlock that stops the cooling before discharge are electronics and are ours. The bank of cylinders and its pipework is not: that is a fire suppression installation, with its concentration calculation and its room integrity test.
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