In the event of fire or electricity cut, all magnetic or electric controllable locks would be released (returned to the open state). For a hotel of 300 rooms, all guests can safely get out of their room and the hotel building. Hotel staff can go into rooms allocated to senior citizens or people with disability. Without such fail-safe feature, hotel staff would have to manually unlock all 300 rooms.

 

It would be desirable for an audible siren to be turned on in case all door locks are released automatically in the background. A fire would be accompanied by an alarm anyway. What about electricity cuts? The siren would have to be battery-powered. Similarly, the locks should run on standby power in case of electricity loss. There are locks that are designed to be fail-secured for installing in data or money safes for instances. This is a major decision with fatal consequences if not properly decided and executed. This is a Compucon system design philosophy.  Do not assume that all locking systems are the same.  

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