Electromagnetic Lock with Sensor Release
Type of Lock: The vast majority of locks used in this application are electromagnetic locks released by a sensor. The requirements are occasionally applied to other locks that require a separate sensor to unlock the door. One example of this would be a powerbolt, which is a bolt that is projected when power is applied.
Code Requirements: The use group or occupancy type must be one where this application is allowed. In addition to the motion sensor that detects an approaching occupant, the lock must be unlocked by actuation of the fire alarm/sprinkler system (if present) loss of power, and a signal from a push button that unlocks the lock for 30 seconds independent of the access control system. The push button must be marked “Push to Exit” and must be located 40 inches to 48 inches vertically above the floor and within 5 feet of the door. Ready access must be provided to the push button.
Common Code Pitfalls: In most recent editions of the IBC and NFPA 101, the section that applies to mag locks released by a sensor is called Access Controlled Egress Doors. Because of this title, there are AHJs and others who believe that this section should be applied to all doors with access control readers, even though those doors typically allow free egress without sensors or other release devices. In the 2015 IBC, the title of the section was changed to Sensor Release of Electrically Locked Egress Doors to avoid this confusion.
More Information: IBC – 1010.1.9.8 (2015), 1008.1.9.8 (2012); NFPA 101 – 7.2.1.6.2 (2015 and 2012)
