Securing a building from intruders is a top priority, but ensuring occupants can escape instantly during a fire is a strict legal requirement. Facility managers and installers constantly face the challenge of balancing robust building security with critical life safety regulations. If you get this balance wrong, you risk massive fines, invalidated insurance, and, most importantly, human lives.
Modern access and control systems provide excellent security, but they must integrate seamlessly with fire safety protocols. When an emergency strikes, electronic locks must yield immediately.
In this guide, we explain the legal requirements for door hardware on fire escape routes. You will learn the critical difference between fail-safe and fail-secure locks, the proper use of exit devices, and how to link your entry system to a fire alarm panel.
Fail-Safe vs. Fail-Secure: What is the Difference?
Understanding how your locks behave when the power cuts out is the foundation of fire safety compliance. Electronic locks fall into two distinct categories: fail-safe and fail-secure.
Fail-Safe Locks (Mandatory for Fire Escapes)
A fail-safe lock requires continuous electrical power to stay locked. Magnetic locks (maglocks) are the most common example. If the power drops—either due to a power cut or a triggered fire alarm—the magnet loses its holding force, and the door opens freely. UK fire safety regulations mandate the use of fail-safe locks on any door designated as an emergency escape route.
Fail-Secure Locks (For Internal Security Only)
A fail-secure lock remains locked when the power fails. Electric strikes often operate this way. They require a burst of electricity to release the locking mechanism. If the building loses power, the door stays shut. You should only use fail-secure locks on internal, high-security rooms (like server rooms or sensitive document storage) that do not form part of a primary evacuation route.
The Role of Door Exit Devices in Access and Control
Your access and control hardware must allow people to exit the building quickly and without needing special knowledge or a physical key. This requires a two-tiered approach to exit devices.
Daily Use: Push-to-Exit and No-Touch Buttons
For normal, day-to-day operations, you fit standard exit buttons on the un-secured side of the door.
- Push-to-Exit: These mechanical buttons momentarily break the power circuit to the lock when pressed, allowing the user to pull the door open.
- No-Touch Sensors: These use infrared technology to detect a hand wave. They are highly hygienic and suffer less mechanical wear, making them ideal for busy commercial environments.
While these devices handle daily traffic, they rely on the main system controller to function. If the controller fails during a fire, the button might not release the door. This is why you need an emergency backup.
Emergency Override: Break Glass Switches
UK regulations strictly require a direct mechanical override on electronically locked fire doors. You achieve this by installing a green "Break Glass" emergency door release on the secure side of the exit.
You must wire this switch in series directly to the power supply of the lock, bypassing the main controller entirely. When a person presses the glass (or plastic element), it physically breaks the electrical circuit. This drops power to the fail-safe maglock instantly. Modern units, such as the ABK-SPC reset switch, use a dropping plastic element rather than actual shattering glass. This makes resetting the system safe and easy once the emergency passes.
Connecting Access and Control to the Fire Alarm Panel
A manual break glass switch is essential, but your building must also open its escape routes automatically when the fire alarm sounds.
You achieve this by integrating your access and control network with the central fire alarm panel. Installers use a dedicated fire relay switch wired into the access control power supply unit (PSU). When the fire alarm triggers, it sends a signal to the relay. The relay instantly cuts the 12V or 24V feed to all the maglocks on the escape route.
This automation ensures that occupants can flee the building rapidly, without having to manually break the glass at every single door.
Routine Testing and Maintenance
Compliance is not a one-time event. Hardware degrades, wires vibrate loose, and backup batteries expire. Facility managers must implement a strict, regular testing schedule to remain compliant with the law.
- Test the Fire Relay: Trigger the fire alarm weekly and physically check that every fail-safe door on the escape route drops open automatically.
- Test the Emergency Releases: Use your reset key to trigger the green break glass units. Verify that power drops to the lock immediately, independent of the main software.
- Check Door Alignment: Ensure that maglocks and door closers are aligned properly so the door swings open easily without sticking.
If any component fails during these tests, you must replace it immediately to maintain the safety of the building.
Conclusion
Fire safety compliance is non-negotiable. Building a secure premises means absolutely nothing if your staff or tenants cannot escape during a crisis. By specifying fail-safe maglocks, fitting resettable break glass switches, and linking your power supplies to the fire alarm panel, you protect both your property and human life.
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