Questions · Fire detection
When the fire alarm goes off, what happens to the access control doors?
They have to let people out, and that is not an access control option: it is a CTE requirement. Doors intended for evacuation must be able to be opened from the side people are coming from without a key, without a card and without knowing the mechanism, and automatic doors have to be left open or able to swing open when the power fails or when they receive an emergency signal.
In practice it is solved by two routes at once: wiring the signal from the fire alarm panel to the access control, and also letting the loss of power itself release what has to be released. Both, because they are different failures: the panel can be fine and there be no power at the door, or the other way round. Turnstiles, tripod turnstiles, car park barriers and high-speed doors all count the same.
And there is a decision taken with the client in front of you and not on site: whether a fire opens the whole building or only the escape route for the affected zone. Opening everything is the simplest and leaves the building with no access control during the incident. It gets decided, it gets written into the cause and effect table and it gets tested by actually triggering it.
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