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2. Electromagnetic door holder - Wikipedia

   en.wikipedia.org/wiki/Electromagnetic_door_holder

   If a fire alarm control panel, burglar alarm control panel, or similar emergency system is triggered, it will cut electrical power to the electromagnetic door holders under its control. The door holders release, allowing the doors to close automatically using door closers. [1] [2] The electric power to keep the doors open is typically 12 VDC ...

3. Fire alarm system - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_system

   Electromagnetic fire door holders may also be hard-wired into the fire panel, radio-controlled, triggered by radio waves from a central controller connected to a fire panel, or acoustic, which learns the sound of the fire alarm and releases the door upon hearing this exact sound. [20]

4. Standards for Alarm Systems, Installation, and Monitoring

   en.wikipedia.org/wiki/Standards_for_Alarm...

   The standard details requirements for a range of alarm systems including central station burglar alarms, police station connected alarms, local alarms, proprietary systems, holdup alarms, and digital alarm communicator system units. It also covers power supplies essential for burglar-alarm equipment operation.

5. Fire door - Wikipedia

   en.wikipedia.org/wiki/Fire_door

   The intumescent and smoke-seal bounding of fire doors should be routinely checked, as should the action of the door closer and latch. Some fire doors are held open by an electromagnet, which is typically wired to a fire alarm system. If the power fails or the fire alarm is activated, the coil is de-energized, and the door closes.

6. BS 5839 Part 1 - Wikipedia

   en.wikipedia.org/wiki/BS_5839_Part_1

   BS 5839 Part 1 Fire detection and fire alarm systems for buildings – Part 1: Code of practice for design, installation, commissioning and maintenance of systems in non-domestic premises [1] is a standard published by the British Standards Institution.

7. UL (safety organization) - Wikipedia

   en.wikipedia.org/wiki/UL_(safety_organization)

   UL 827, Central-Station Alarm Services (ANSI Approved: October 19, 2023) [31] UL 827A, UL LLC Outline of Investigation for Hosted Central Station Services [32] UL 864, Control Units and Accessories for Fire Alarm Systems (ANSI Approved: October 09, 2023) [33] UL 985, Household Fire Warning System Units (ANSI Approved: October 07, 2022) [34]