What This Article Covers and Who It Helps
When a building triggers a lockdown -- whether at a K-12 school, a hospital campus, or a corporate facility -- the door hardware has to respond correctly, immediately, and without human intervention at every opening. This guide explains how emergency lockdown signals travel from a central control point to individual door hardware devices, what hardware components must be specified to receive and act on those signals, and where the most common integration failures occur in the field. It is written for facility managers, security consultants, and commercial hardware specifiers who are either designing a new system or auditing an existing one.
What Is a Lockdown Signal, in Hardware Terms?
A lockdown signal is an electrical command -- typically a dry-contact closure or a network-based message -- sent from a central access control system, a panic button, or a fire/security panel to one or more door hardware devices simultaneously. The signal instructs those devices to change state: an electrified lock engages, a magnetic holder releases a fire door, or an electric strike de-energizes so the door cannot be opened from outside without credentials.
The signal itself is simple. What determines whether the building actually locks down correctly is whether the hardware on each door is specified, wired, and programmed to respond to that signal in the right way.
The Hardware Layer That Has to Be in Place First
A lockdown signal is only as effective as the hardware it controls. For each door in the lockdown zone, the opening must include one or more of the following electrified components:
- Electrified mortise or cylindrical locksets -- these receive a signal to engage or release the locking bolt, converting a standard lock into a remotely controlled device. Sargent, Corbin Russwin, and Hager all offer electrified lock bodies designed for this purpose.
- Electrified exit devices -- panic bars with electric latch retraction (ELR) or electric dogging allow the access control system to hold the bar in the latched or unlatched state on command. For lockdown, ELR models can be commanded to latch and hold, preventing outside entry while preserving one-motion egress from the inside per life safety code requirements.
- Electromagnetic locks (maglocks) -- surface-mounted or concealed maglocks hold a door closed by magnetic force. On a lockdown signal, the maglock energizes and holds the door shut. These require careful coordination with egress code: a means of immediate release must always be available from the egress side.
- Electric strikes -- a fail-secure electric strike keeps the keeper locked until the access control system releases it. Under lockdown, fail-secure strikes simply stay locked without needing a separate command.
Fail-Safe vs. Fail-Secure: The Decision That Drives Everything
Every electrified opening in a lockdown system must be specified as either fail-safe (unlocks when power is lost) or fail-secure (stays locked when power is lost). This single decision affects life safety compliance, egress continuity, and how the door behaves during a power disruption -- which may coincide with an emergency event.
- Stairwell exit doors and fire-rated egress paths generally require fail-safe hardware so occupants can always exit.
- Perimeter entries and interior secure zones in a lockdown scenario often favor fail-secure, so a power cut does not inadvertently unlock the building.
- Fire alarm integration adds another layer: NFPA 80 and NFPA 101 requirements mean that certain door holders and electrified assemblies must release on fire alarm signal regardless of lockdown state. These two signal types -- fire and lockdown -- must not conflict at the hardware level.
Coordinate fail-safe/fail-secure decisions across Division 08 (door hardware), Division 26 (electrical), and Division 28 (electronic safety and security) before the hardware schedule is finalized.
How the Signal Gets from the Panel to the Door
The physical wiring path is where many lockdown integrations break down during installation. Power and signal must travel from the access control panel or power supply to the electrified hardware on each door. For swinging doors, that path crosses a moving hinge point -- a detail that must be solved before rough-in.
- Door cords (wire loops) -- a simple and low-cost solution for light-duty or low-cycle openings. Not ideal for high-traffic doors because repeated flexing degrades the conductor over time.
- Electrified power transfer hinges (EPT hinges) -- conduct power through the hinge barrel itself using internal contacts. A cleaner solution that eliminates the exposed loop. Available from Hager, McKinney, Markar, and ABH Manufacturing for standard and heavy-duty applications.
- Continuous electrified hinges -- full-height hinges with concealed conductors running the length of the door. Preferred for high-cycle openings such as hospital corridor cross-doors or school main entries where wire fatigue is a real concern.
Whichever transfer method is selected, it must carry sufficient conductors for every electrified device on the door -- the lock, any door position switch, a request-to-exit (REX) device, and any monitoring output. Under-specifying conductor count at the hinge is one of the most common first-install errors on electrified openings.
Door Position Switches and REX Devices: The Confirmation Layer
A lockdown command tells the hardware to lock. But how does the system know the door actually closed before it locked? That is the role of the door position switch (DPS) -- a magnetic contact that reports door open or closed state back to the access control panel. Without a DPS, a lockdown command sent to a door that is standing open produces a locked-open opening: a false sense of security.
Equally important is the request-to-exit (REX) device on the egress side. During a lockdown, occupants inside must still be able to exit without credentials -- life safety codes require it. A REX signal (from a motion sensor or push button) tells the access control system that an authorized egress is occurring, preventing a door-forced alarm from triggering. On electrified panic bars with a built-in switch, the REX output is built into the device itself.
Application Contexts Where This Gets Specified Most Often
K-12 Schools
School lockdown capability is increasingly driven by state mandates. Classroom doors are the primary target: electrified cylindrical or mortise locksets from Sargent or Corbin Russwin allow a single command from the main office to lock every classroom simultaneously. Exit devices on exterior egress doors must maintain one-motion egress even in lockdown state.
Healthcare Facilities
Hospitals use lockdown protocols for infant abduction prevention, psychiatric unit control, and general security events. The hardware layer here is more complex because of fire door integration requirements under NFPA 80 and NFPA 101. Electromagnetic holders on corridor cross-doors must release on fire alarm regardless of lockdown state -- the two signal paths must be wired independently.
Corporate and Government Facilities
Perimeter control during a lockdown event relies on electric strikes and maglocks on main entries, often paired with video intercom and card access at the same opening. Fail-secure strikes ensure that a power interruption does not inadvertently release the perimeter.
Where the Integration Fails: Common Specification Gaps
- Specifying an electrified lock without accounting for the power transfer method at the hinge -- resulting in a field-fabricated wire loop that fails within months.
- Failing to coordinate fire alarm release wiring with lockdown hold signals -- creating a condition where a fire alarm unlocks doors the lockdown system just secured.
- No door position switches on the schedule -- the system locks but cannot confirm closure.
- Selecting a fail-safe maglock on an interior secure door that is intended to stay locked during a power disruption.
- Exit devices without a REX output, causing every egress during lockdown to register as a door-forced alarm.
Specify the Whole Signal Path, Not Just the Lock
A lockdown-capable opening is a system: power supply, access control output, wiring transfer device, electrified lock or exit device, door position switch, REX device, and egress-compliant hardware on the push side. Specifying the lock alone and leaving the integration details to the low-voltage contractor is how lockdown systems end up incomplete or non-functional at occupancy.
DoorwaysPlus carries electrified locksets, exit devices with electric latch retraction, power transfer hinges, and related hardware from Sargent, Corbin Russwin, Hager, and other preferred lines. If you are building or auditing a lockdown hardware schedule, our team can help you identify the right components for each opening type. Contact DoorwaysPlus for a project quote or hardware schedule review.