What This Article Covers and Who It Helps
A magnetic lock kit that includes a keypad, power supply, and push button looks straightforward on the shelf. But the moment it goes on an egress door, a specific sequence of release methods must work together correctly or the installation fails code review. This guide is for commercial electrical contractors, security integrators, and facility managers who are specifying or installing a mag lock kit on an exterior or interior access-controlled door and want to get the egress logic right before the authority having jurisdiction (AHJ) shows up.
What Is a Magnetic Lock Kit With Keypad?
A magnetic lock kit bundles the core components needed to control a single door electronically. A typical kit at this class of product includes:
- An electromagnetic lock body (mounted in or at the frame head)
- An armature plate (mounted on the door face, top rail)
- A weatherproof keypad for credential-based entry
- A power supply to drive the lock
- A request-to-exit (REX) push button for egress release
The keypad handles the ingress side. The push button and any supplemental release methods handle the egress side. These are two separate circuits solving two separate problems, and conflating them is where most wiring errors begin.
Why the Egress Release Sequence Is the Hard Part
Electromagnetic locks are fail-safe devices: power on means locked, power off means the door opens. That characteristic makes egress release wiring critical. Under IBC and NFPA 101, an electromagnetically locked egress door must release under several independent conditions. Getting any one of them wrong produces a code violation.
The Three Required Release Paths
- Manual REX push button: A listed push button mounted 40 to 48 inches above the floor, within five feet of the door, must interrupt power to the lock and hold it released for a minimum period. This is the local, always-available egress method for any occupant who cannot or does not use the keypad.
- Fire alarm interface: The power supply must be wired so that activation of the building fire alarm system drops power to the lock and keeps it dropped until the system is reset. This is not optional on an egress door. A mag lock that stays energized during a fire alarm is a life-safety violation regardless of occupancy type.
- Loss of primary power: Fail-safe behavior is built into electromagnetic locks by design, but the power supply must be wired to reflect this. A battery-backed supply that holds the lock energized through a power outage defeats the fail-safe principle and will not pass inspection.
Some jurisdictions and occupancy types also require a door position switch (DPS) that monitors whether the door is actually secured, and some require a sensor that detects an approaching occupant on the egress side and releases the lock automatically. Confirm which edition of IBC and NFPA 101 your AHJ has adopted before finalizing the wiring diagram.
The Wiring Decision That Gets Made in the Wrong Order
Here is the most common field sequence that causes a re-inspection:
- The kit arrives. The integrator wires the keypad for entry and confirms the lock energizes and releases on keypad input. That half works.
- The push button is wired to a NO (normally open) contact that triggers a relay in the power supply. This also works.
- The fire alarm dry contact interface is left to the low-voltage electrician who is finishing a different phase of the job. Nobody confirms whether the contact is wired normally open or normally closed to the power supply terminal.
- The AHJ pulls the fire alarm during inspection. The lock stays on. Fail.
The fire alarm interface terminal on most access control power supplies expects a normally closed (NC) dry contact loop. When the alarm activates, the loop opens, cutting power to the lock. If the integrator wires a normally open contact from the fire alarm panel, the lock never releases on alarm. This is a one-wire error that requires a re-inspection and, in some cases, a reopened ceiling or conduit run.
Verify the Contact Type Before You Pull Wire
Before the first wire goes in, pull the power supply wiring diagram and confirm:
- Which terminal accepts the fire alarm interface (FA, FA IN, or similar)
- Whether the terminal expects NC or NO contact closure
- Whether the REX push button terminal is timed or momentary and what the unlock duration is
- Whether the power supply supports door position switch monitoring and whether your AHJ requires it
Exterior Locations Add a Weatherproofing Layer to the Equation
A weatherproof keypad addresses rain and temperature exposure on the credential-entry side. But exterior mag lock installations add hardware coordination decisions that do not appear on interior doors:
- Lock body orientation: Most electromagnetic locks are rated for interior use. Verify the lock body in your kit carries a suitable rating for the exposure level at your opening. A covered vestibule differs from a fully exposed loading dock entry.
- Bracket selection: Exterior hollow metal frames, aluminum storefront frames, and wood frames each require different mounting brackets (L bracket, Z bracket, or drop plate) to position the lock body correctly against the armature plate. Using the wrong bracket creates an air gap that reduces holding force significantly.
- Conduit entry points: On exterior applications, all conduit penetrations into the frame head must be sealed against moisture. Water intrusion into the lock body or power transfer path is a leading cause of premature electromagnetic lock failure in outdoor-adjacent installations.
Industrial and Institutional Applications: Where Kits Work and Where They Fall Short
A bundled mag lock kit is a practical solution for many openings:
- Secondary exterior entries at schools or office buildings where a keypad is preferred over card readers
- Warehouse or distribution facility side doors requiring controlled entry without a full access control panel
- Retail back-of-house doors where staff credential entry is needed but budget limits a full integrated system
Where kits tend to fall short is in healthcare and high-security institutional settings. In healthcare occupancies (I-2), IBC and NFPA 101 have specific provisions governing how electromagnetic locks interact with clinical workflow and patient egress. A standalone kit without integration to a nurse call or access control system often cannot satisfy those requirements. In those cases, a separately specified electromagnetic lock, access control power supply, and reader or keypad coordinated with the building system is the appropriate path.
Before You Order: Five Questions Worth Answering
- Is the door on an egress path? If yes, confirm which code edition applies and what release methods are required.
- What is the fire alarm panel providing: dry contact NC, dry contact NO, or a relay output? Match it to the power supply terminal.
- Is the opening fire rated? A magnetic lock on a fire-rated door requires fire alarm release wiring and must not hold the door open in a fire event.
- What bracket configuration does the frame head require? L bracket, Z bracket, or drop plate depends on frame profile and door swing.
- Does the AHJ require a door position switch or motion sensor on the egress side in addition to the push button?
Hardware Coordination on the Rest of the Opening
A mag lock kit secures the opening electronically, but the mechanical hardware on the door still matters. A door closer is required to ensure positive closure so the armature plate seats against the lock body on every cycle. Without a properly adjusted closer, the lock holds force against a slightly open door, reducing security and eventually damaging the armature plate or lock face.
Closers from Hager, Norton, or PDQ paired with the correct spring size for the door width and weight are a straightforward complement to any mag lock installation. Similarly, if the door is in a high-traffic exterior location, a threshold and perimeter weatherstripping package from Pemko helps manage the gap tolerances that affect both energy performance and armature alignment over time.
DoorwaysPlus carries electromagnetic lock kits, access control power supplies, request-to-exit devices, door closers, and the complementary hardware needed to complete a properly coordinated opening. If you are specifying a mag lock kit and need help confirming the egress wiring sequence or bracket compatibility for your frame type, our team can help you work through the details before anything ships.